general: Mark many constructors as `explicit`

Closes #1514
Fixes #1431

dtool/src/prc/configVariableBool.h

@@ -23,10 +23,14 @@
 class EXPCL_DTOOL_PRC ConfigVariableBool : public ConfigVariable {
 PUBLISHED:
   INLINE explicit ConfigVariableBool(const std::string &name);
-  INLINE ConfigVariableBool(const std::string &name, bool default_value,
-                            const std::string &description = std::string(), int flags = 0);
-  INLINE ConfigVariableBool(const std::string &name, const std::string &default_value,
-                            const std::string &description = std::string(), int flags = 0);
+  INLINE explicit ConfigVariableBool(const std::string &name,
+                                     bool default_value,
+                                     const std::string &description = std::string(),
+                                     int flags = 0);
+  INLINE explicit ConfigVariableBool(const std::string &name,
+                                     const std::string &default_value,
+                                     const std::string &description = std::string(),
+                                     int flags = 0);
 
   INLINE void operator = (bool value);
   ALWAYS_INLINE operator bool () const;

dtool/src/prc/configVariableDouble.h

@@ -24,12 +24,14 @@
 class EXPCL_DTOOL_PRC ConfigVariableDouble : public ConfigVariable {
 PUBLISHED:
   INLINE explicit ConfigVariableDouble(const std::string &name);
-  INLINE ConfigVariableDouble(const std::string &name, double default_value,
-                              const std::string &description = std::string(),
-                              int flags = 0);
-  INLINE ConfigVariableDouble(const std::string &name, const std::string &default_value,
-                              const std::string &description = std::string(),
-                              int flags = 0);
+  INLINE explicit ConfigVariableDouble(const std::string &name,
+                                       double default_value,
+                                       const std::string &description = std::string(),
+                                       int flags = 0);
+  INLINE explicit ConfigVariableDouble(const std::string &name,
+                                       const std::string &default_value,
+                                       const std::string &description = std::string(),
+                                       int flags = 0);
 
   INLINE void operator = (double value);
   INLINE operator double () const;

dtool/src/prc/configVariableFilename.h

@@ -27,8 +27,10 @@
 class EXPCL_DTOOL_PRC ConfigVariableFilename : public ConfigVariable {
 PUBLISHED:
   INLINE explicit ConfigVariableFilename(const std::string &name);
-  INLINE ConfigVariableFilename(const std::string &name, const Filename &default_value,
-                                const std::string &description = std::string(), int flags = 0);
+  INLINE explicit ConfigVariableFilename(const std::string &name,
+                                         const Filename &default_value,
+                                         const std::string &description = std::string(),
+                                         int flags = 0);
 
   INLINE void operator = (const Filename &value);
   INLINE operator const Filename &() const;

dtool/src/prc/configVariableInt.h

@@ -24,12 +24,14 @@
 class EXPCL_DTOOL_PRC ConfigVariableInt : public ConfigVariable {
 PUBLISHED:
   INLINE explicit ConfigVariableInt(const std::string &name);
-  INLINE ConfigVariableInt(const std::string &name, int default_value,
-                           const std::string &description = std::string(),
-                           int flags = 0);
-  INLINE ConfigVariableInt(const std::string &name, const std::string &default_value,
-                           const std::string &description = std::string(),
-                           int flags = 0);
+  INLINE explicit ConfigVariableInt(const std::string &name,
+                                    int default_value,
+                                    const std::string &description = std::string(),
+                                    int flags = 0);
+  INLINE explicit ConfigVariableInt(const std::string &name,
+                                    const std::string &default_value,
+                                    const std::string &description = std::string(),
+                                    int flags = 0);
 
   INLINE void operator = (int value);
   INLINE operator int () const;

dtool/src/prc/configVariableInt64.h

@@ -25,12 +25,14 @@
 class EXPCL_DTOOL_PRC ConfigVariableInt64 : public ConfigVariable {
 PUBLISHED:
   INLINE explicit ConfigVariableInt64(const std::string &name);
-  INLINE ConfigVariableInt64(const std::string &name, int64_t default_value,
-                             const std::string &description = std::string(),
-                             int flags = 0);
-  INLINE ConfigVariableInt64(const std::string &name, const std::string &default_value,
-                             const std::string &description = std::string(),
-                             int flags = 0);
+  INLINE explicit ConfigVariableInt64(const std::string &name,
+                                      int64_t default_value,
+                                      const std::string &description = std::string(),
+                                      int flags = 0);
+  INLINE explicit ConfigVariableInt64(const std::string &name,
+                                      const std::string &default_value,
+                                      const std::string &description = std::string(),
+                                      int flags = 0);
 
   INLINE void operator = (int64_t value);
   INLINE operator int64_t () const;

dtool/src/prc/configVariableList.h

@@ -30,9 +30,9 @@
  */
 class EXPCL_DTOOL_PRC ConfigVariableList : public ConfigVariableBase {
 PUBLISHED:
-  INLINE ConfigVariableList(const std::string &name,
-                            const std::string &description = std::string(),
-                            int flags = 0);
+  INLINE explicit ConfigVariableList(const std::string &name,
+                                     const std::string &description = std::string(),
+                                     int flags = 0);
   INLINE ~ConfigVariableList();
 
   INLINE size_t get_num_values() const;

dtool/src/prc/configVariableSearchPath.h

@@ -35,17 +35,17 @@
  */
 class EXPCL_DTOOL_PRC ConfigVariableSearchPath : public ConfigVariableBase {
 PUBLISHED:
-  INLINE ConfigVariableSearchPath(const std::string &name,
-                                  const std::string &description = std::string(),
-                                  int flags = 0);
-  INLINE ConfigVariableSearchPath(const std::string &name,
-                                  const DSearchPath &default_value,
-                                  const std::string &description,
-                                  int flags = 0);
-  INLINE ConfigVariableSearchPath(const std::string &name,
-                                  const std::string &default_value,
-                                  const std::string &description,
-                                  int flags = 0);
+  INLINE explicit ConfigVariableSearchPath(const std::string &name,
+                                           const std::string &description = std::string(),
+                                           int flags = 0);
+  INLINE explicit ConfigVariableSearchPath(const std::string &name,
+                                           const DSearchPath &default_value,
+                                           const std::string &description,
+                                           int flags = 0);
+  INLINE explicit ConfigVariableSearchPath(const std::string &name,
+                                           const std::string &default_value,
+                                           const std::string &description,
+                                           int flags = 0);
   INLINE ~ConfigVariableSearchPath();
 
   INLINE operator DSearchPath () const;

dtool/src/prc/configVariableString.h

@@ -22,9 +22,11 @@
  */
 class EXPCL_DTOOL_PRC ConfigVariableString : public ConfigVariable {
 PUBLISHED:
-  INLINE ConfigVariableString(const std::string &name);
-  INLINE ConfigVariableString(const std::string &name, const std::string &default_value,
-                              const std::string &description = std::string(), int flags = 0);
+  INLINE explicit ConfigVariableString(const std::string &name);
+  INLINE explicit ConfigVariableString(const std::string &name,
+                                       const std::string &default_value,
+                                       const std::string &description = std::string(),
+                                       int flags = 0);
 
   INLINE void operator = (const std::string &value);
   INLINE operator const std::string & () const;

panda/src/bullet/bulletContactCallbackData.h

@@ -28,10 +28,10 @@
 class EXPCL_PANDABULLET BulletContactCallbackData : public CallbackData {
 
 PUBLISHED:
-  INLINE BulletContactCallbackData(BulletManifoldPoint &mp,
-                                   PandaNode *node0, PandaNode *node1,
-                                   int id0, int id1,
-                                   int index0, int index1);
+  INLINE explicit BulletContactCallbackData(BulletManifoldPoint &mp,
+                                            PandaNode *node0, PandaNode *node1,
+                                            int id0, int id1,
+                                            int index0, int index1);
 
   INLINE BulletManifoldPoint &get_manifold() const;
   INLINE PandaNode *get_node0() const;

panda/src/bullet/bulletTickCallbackData.h

@@ -26,7 +26,7 @@
 class EXPCL_PANDABULLET BulletTickCallbackData : public CallbackData {
 
 PUBLISHED:
-  INLINE BulletTickCallbackData(btScalar timestep);
+  INLINE explicit BulletTickCallbackData(btScalar timestep);
 
   INLINE PN_stdfloat get_timestep() const;
 

panda/src/chan/animChannelScalarTable.h

@@ -31,7 +31,7 @@ protected:
   AnimChannelScalarTable(AnimGroup *parent, const AnimChannelScalarTable &copy);
 
 PUBLISHED:
-  AnimChannelScalarTable(AnimGroup *parent, const std::string &name);
+  explicit AnimChannelScalarTable(AnimGroup *parent, const std::string &name);
 
 public:
   virtual bool has_changed(int last_frame, double last_frac,

panda/src/device/inputDeviceNode.h

@@ -28,7 +28,7 @@
  */
 class EXPCL_PANDA_DEVICE InputDeviceNode : public DataNode {
 PUBLISHED:
-  InputDeviceNode(InputDevice *device, const std::string &name);
+  explicit InputDeviceNode(InputDevice *device, const std::string &name);
 
 public:
   void set_device(InputDevice *device);

panda/src/downloader/httpEntityTag.h

@@ -25,7 +25,7 @@ class EXPCL_PANDA_DOWNLOADER HTTPEntityTag {
 PUBLISHED:
   INLINE HTTPEntityTag();
   HTTPEntityTag(const std::string &text);
-  INLINE HTTPEntityTag(bool weak, const std::string &tag);
+  INLINE explicit HTTPEntityTag(bool weak, const std::string &tag);
   INLINE HTTPEntityTag(const HTTPEntityTag &copy);
   INLINE void operator = (const HTTPEntityTag &copy);
 

panda/src/gobj/geomVertexArrayFormat.h

@@ -48,26 +48,26 @@ class EXPCL_PANDA_GOBJ GeomVertexArrayFormat final : public TypedWritableReferen
 PUBLISHED:
   GeomVertexArrayFormat();
   GeomVertexArrayFormat(const GeomVertexArrayFormat &copy);
-  GeomVertexArrayFormat(CPT_InternalName name0, int num_components0,
-                        NumericType numeric_type0, Contents contents0);
-  GeomVertexArrayFormat(CPT_InternalName name0, int num_components0,
-                        NumericType numeric_type0, Contents contents0,
-                        CPT_InternalName name1, int num_components1,
-                        NumericType numeric_type1, Contents contents1);
-  GeomVertexArrayFormat(CPT_InternalName name0, int num_components0,
-                        NumericType numeric_type0, Contents contents0,
-                        CPT_InternalName name1, int num_components1,
-                        NumericType numeric_type1, Contents contents1,
-                        CPT_InternalName name2, int num_components2,
-                        NumericType numeric_type2, Contents contents2);
-  GeomVertexArrayFormat(CPT_InternalName name0, int num_components0,
-                        NumericType numeric_type0, Contents contents0,
-                        CPT_InternalName name1, int num_components1,
-                        NumericType numeric_type1, Contents contents1,
-                        CPT_InternalName name2, int num_components2,
-                        NumericType numeric_type2, Contents contents2,
-                        CPT_InternalName name3, int num_components3,
-                        NumericType numeric_type3, Contents contents3);
+  explicit GeomVertexArrayFormat(CPT_InternalName name0, int num_components0,
+                                 NumericType numeric_type0, Contents contents0);
+  explicit GeomVertexArrayFormat(CPT_InternalName name0, int num_components0,
+                                 NumericType numeric_type0, Contents contents0,
+                                 CPT_InternalName name1, int num_components1,
+                                 NumericType numeric_type1, Contents contents1);
+  explicit GeomVertexArrayFormat(CPT_InternalName name0, int num_components0,
+                                 NumericType numeric_type0, Contents contents0,
+                                 CPT_InternalName name1, int num_components1,
+                                 NumericType numeric_type1, Contents contents1,
+                                 CPT_InternalName name2, int num_components2,
+                                 NumericType numeric_type2, Contents contents2);
+  explicit GeomVertexArrayFormat(CPT_InternalName name0, int num_components0,
+                                 NumericType numeric_type0, Contents contents0,
+                                 CPT_InternalName name1, int num_components1,
+                                 NumericType numeric_type1, Contents contents1,
+                                 CPT_InternalName name2, int num_components2,
+                                 NumericType numeric_type2, Contents contents2,
+                                 CPT_InternalName name3, int num_components3,
+                                 NumericType numeric_type3, Contents contents3);
   void operator = (const GeomVertexArrayFormat &copy);
   ~GeomVertexArrayFormat();
 

panda/src/gobj/geomVertexReader.h

@@ -46,22 +46,22 @@
  */
 class EXPCL_PANDA_GOBJ GeomVertexReader : public GeomEnums {
 PUBLISHED:
-  INLINE GeomVertexReader(Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexReader(Thread *current_thread = Thread::get_current_thread());
   INLINE GeomVertexReader(CPT(GeomVertexData) vertex_data,
                           Thread *current_thread = Thread::get_current_thread());
-  INLINE GeomVertexReader(CPT(GeomVertexData) vertex_data,
-                          CPT_InternalName name,
-                          Thread *current_thread = Thread::get_current_thread());
-  INLINE GeomVertexReader(CPT(GeomVertexArrayData) array_data,
-                          Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexReader(CPT(GeomVertexData) vertex_data,
+                                   CPT_InternalName name,
+                                   Thread *current_thread = Thread::get_current_thread());
   INLINE GeomVertexReader(CPT(GeomVertexArrayData) array_data,
-                          int column,
                           Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexReader(CPT(GeomVertexArrayData) array_data,
+                                   int column,
+                                   Thread *current_thread = Thread::get_current_thread());
 
 public:
-  INLINE GeomVertexReader(const GeomVertexDataPipelineReader *data_reader,
-                          const InternalName *name,
-                          bool force = true);
+  INLINE explicit GeomVertexReader(const GeomVertexDataPipelineReader *data_reader,
+                                   const InternalName *name,
+                                   bool force = true);
 
 PUBLISHED:
   INLINE GeomVertexReader(const GeomVertexReader &copy);

panda/src/gobj/geomVertexRewriter.h

@@ -32,14 +32,14 @@
  */
 class EXPCL_PANDA_GOBJ GeomVertexRewriter : public GeomVertexWriter, public GeomVertexReader {
 PUBLISHED:
-  INLINE GeomVertexRewriter(Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexRewriter(Thread *current_thread = Thread::get_current_thread());
   INLINE GeomVertexRewriter(GeomVertexData *vertex_data, Thread *current_thread = Thread::get_current_thread());
-  INLINE GeomVertexRewriter(GeomVertexData *vertex_data,
-                            CPT_InternalName name,
-                            Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexRewriter(GeomVertexData *vertex_data,
+                                     CPT_InternalName name,
+                                     Thread *current_thread = Thread::get_current_thread());
   INLINE GeomVertexRewriter(GeomVertexArrayData *array_data, Thread *current_thread = Thread::get_current_thread());
-  INLINE GeomVertexRewriter(GeomVertexArrayData *array_data,
-                            int column, Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexRewriter(GeomVertexArrayData *array_data,
+                                     int column, Thread *current_thread = Thread::get_current_thread());
   INLINE GeomVertexRewriter(const GeomVertexRewriter &copy);
   INLINE void operator = (const GeomVertexRewriter &copy);
   INLINE ~GeomVertexRewriter();

panda/src/gobj/geomVertexWriter.h

@@ -54,21 +54,21 @@
  */
 class EXPCL_PANDA_GOBJ GeomVertexWriter : public GeomEnums {
 PUBLISHED:
-  INLINE GeomVertexWriter(Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexWriter(Thread *current_thread = Thread::get_current_thread());
   INLINE GeomVertexWriter(PT(GeomVertexData) vertex_data,
                           Thread *current_thread = Thread::get_current_thread());
-  INLINE GeomVertexWriter(PT(GeomVertexData) vertex_data,
-                          CPT_InternalName name,
-                          Thread *current_thread = Thread::get_current_thread());
-  INLINE GeomVertexWriter(PT(GeomVertexArrayData) array_data,
-                          Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexWriter(PT(GeomVertexData) vertex_data,
+                                   CPT_InternalName name,
+                                   Thread *current_thread = Thread::get_current_thread());
   INLINE GeomVertexWriter(PT(GeomVertexArrayData) array_data,
-                          int column,
                           Thread *current_thread = Thread::get_current_thread());
+  INLINE explicit GeomVertexWriter(PT(GeomVertexArrayData) array_data,
+                                   int column,
+                                   Thread *current_thread = Thread::get_current_thread());
 
 public:
-  INLINE GeomVertexWriter(GeomVertexDataPipelineWriter *data_writer,
-                          const InternalName *name);
+  INLINE explicit GeomVertexWriter(GeomVertexDataPipelineWriter *data_writer,
+                                   const InternalName *name);
 
 PUBLISHED:
   INLINE GeomVertexWriter(const GeomVertexWriter &copy);

panda/src/gobj/paramTexture.h

@@ -28,7 +28,7 @@ protected:
   INLINE ParamTextureSampler() {};
 
 PUBLISHED:
-  INLINE ParamTextureSampler(Texture *tex, const SamplerState &sampler);
+  INLINE explicit ParamTextureSampler(Texture *tex, const SamplerState &sampler);
 
   INLINE virtual TypeHandle get_value_type() const;
   INLINE Texture *get_texture() const;
@@ -89,7 +89,7 @@ protected:
   };
 
 PUBLISHED:
-  INLINE ParamTextureImage(Texture *tex, bool read, bool write, int z=-1, int n=0);
+  INLINE explicit ParamTextureImage(Texture *tex, bool read, bool write, int z=-1, int n=0);
 
   INLINE virtual TypeHandle get_value_type() const;
 

panda/src/gobj/transformBlend.h

@@ -32,16 +32,16 @@
 class EXPCL_PANDA_GOBJ TransformBlend {
 PUBLISHED:
   INLINE TransformBlend();
-  INLINE TransformBlend(const VertexTransform *transform0, PN_stdfloat weight0);
-  INLINE TransformBlend(const VertexTransform *transform0, PN_stdfloat weight0,
-                        const VertexTransform *transform1, PN_stdfloat weight1);
-  INLINE TransformBlend(const VertexTransform *transform0, PN_stdfloat weight0,
-                        const VertexTransform *transform1, PN_stdfloat weight1,
-                        const VertexTransform *transform2, PN_stdfloat weight2);
-  INLINE TransformBlend(const VertexTransform *transform0, PN_stdfloat weight0,
-                        const VertexTransform *transform1, PN_stdfloat weight1,
-                        const VertexTransform *transform2, PN_stdfloat weight2,
-                        const VertexTransform *transform3, PN_stdfloat weight3);
+  INLINE explicit TransformBlend(const VertexTransform *transform0, PN_stdfloat weight0);
+  INLINE explicit TransformBlend(const VertexTransform *transform0, PN_stdfloat weight0,
+                                 const VertexTransform *transform1, PN_stdfloat weight1);
+  INLINE explicit TransformBlend(const VertexTransform *transform0, PN_stdfloat weight0,
+                                 const VertexTransform *transform1, PN_stdfloat weight1,
+                                 const VertexTransform *transform2, PN_stdfloat weight2);
+  INLINE explicit TransformBlend(const VertexTransform *transform0, PN_stdfloat weight0,
+                                 const VertexTransform *transform1, PN_stdfloat weight1,
+                                 const VertexTransform *transform2, PN_stdfloat weight2,
+                                 const VertexTransform *transform3, PN_stdfloat weight3);
   INLINE TransformBlend(const TransformBlend &copy);
   INLINE void operator = (const TransformBlend &copy);
   INLINE ~TransformBlend();

panda/src/linmath/configVariableColor.h

@@ -34,13 +34,15 @@
  */
 class EXPCL_PANDA_LINMATH ConfigVariableColor : public ConfigVariable {
 PUBLISHED:
-  INLINE ConfigVariableColor(const std::string &name);
-  INLINE ConfigVariableColor(const std::string &name, const LColor &default_value,
-                             const std::string &description = std::string(),
-                             int flags = 0);
-  INLINE ConfigVariableColor(const std::string &name, const std::string &default_value,
-                             const std::string &description = std::string(),
-                             int flags = 0);
+  INLINE explicit ConfigVariableColor(const std::string &name);
+  INLINE explicit ConfigVariableColor(const std::string &name,
+                                      const LColor &default_value,
+                                      const std::string &description = std::string(),
+                                      int flags = 0);
+  INLINE explicit ConfigVariableColor(const std::string &name,
+                                      const std::string &default_value,
+                                      const std::string &description = std::string(),
+                                      int flags = 0);
 
   INLINE void operator = (const LColor &value);
   INLINE operator const LColor & () const;

panda/src/linmath/lmatrix4_src.h

@@ -72,7 +72,8 @@ PUBLISHED:
   // Construct a 4x4 matrix given a 3x3 rotation matrix and an optional
   // translation component.
   INLINE_LINMATH FLOATNAME(LMatrix4)(const FLOATNAME(LMatrix3) &upper3);
-  INLINE_LINMATH FLOATNAME(LMatrix4)(const FLOATNAME(LMatrix3) &upper3,const FLOATNAME(LVecBase3) &trans);
+  INLINE_LINMATH explicit FLOATNAME(LMatrix4)(const FLOATNAME(LMatrix3) &upper3,
+                                              const FLOATNAME(LVecBase3) &trans);
 
   INLINE_LINMATH void fill(FLOATTYPE fill_value);
   INLINE_LINMATH void set(FLOATTYPE e00, FLOATTYPE e01, FLOATTYPE e02, FLOATTYPE e03,

panda/src/linmath/lorientation_src.h

@@ -21,9 +21,9 @@ PUBLISHED:
   INLINE_LINMATH FLOATNAME(LOrientation)();
   INLINE_LINMATH FLOATNAME(LOrientation)(const FLOATNAME(LQuaternion) &c);
   INLINE_LINMATH FLOATNAME(LOrientation)(FLOATTYPE r, FLOATTYPE i, FLOATTYPE j, FLOATTYPE k);
-  INLINE_LINMATH FLOATNAME(LOrientation)(const FLOATNAME(LVector3) &point_at, FLOATTYPE twist);
-  INLINE_LINMATH FLOATNAME(LOrientation)(const FLOATNAME(LMatrix3) &m);
-  INLINE_LINMATH FLOATNAME(LOrientation)(const FLOATNAME(LMatrix4) &m);
+  INLINE_LINMATH explicit FLOATNAME(LOrientation)(const FLOATNAME(LVector3) &point_at, FLOATTYPE twist);
+  INLINE_LINMATH explicit FLOATNAME(LOrientation)(const FLOATNAME(LMatrix3) &m);
+  INLINE_LINMATH explicit FLOATNAME(LOrientation)(const FLOATNAME(LMatrix4) &m);
 
   INLINE_LINMATH FLOATNAME(LOrientation)
   operator * (const FLOATNAME(LRotation) &other) const;

panda/src/linmath/lpoint3_src.h

@@ -24,7 +24,7 @@ PUBLISHED:
   INLINE_LINMATH FLOATNAME(LPoint3)(const FLOATNAME(LVecBase3) &copy);
   INLINE_LINMATH FLOATNAME(LPoint3)(FLOATTYPE fill_value);
   INLINE_LINMATH FLOATNAME(LPoint3)(FLOATTYPE x, FLOATTYPE y, FLOATTYPE z);
-  INLINE_LINMATH FLOATNAME(LPoint3)(const FLOATNAME(LVecBase2) &copy, FLOATTYPE z);
+  INLINE_LINMATH explicit FLOATNAME(LPoint3)(const FLOATNAME(LVecBase2) &copy, FLOATTYPE z);
 
   PY_EXTENSION(INLINE_LINMATH PyObject *__getattr__(PyObject *self, const std::string &attr_name) const);
   PY_EXTENSION(INLINE_LINMATH int __setattr__(PyObject *self, const std::string &attr_name, PyObject *assign));

panda/src/linmath/lpoint4_src.h

@@ -20,7 +20,7 @@ PUBLISHED:
   INLINE_LINMATH FLOATNAME(LPoint4)(const FLOATNAME(LVecBase4) &copy);
   INLINE_LINMATH FLOATNAME(LPoint4)(FLOATTYPE fill_value);
   INLINE_LINMATH FLOATNAME(LPoint4)(FLOATTYPE x, FLOATTYPE y, FLOATTYPE z, FLOATTYPE w);
-  INLINE_LINMATH FLOATNAME(LPoint4)(const FLOATNAME(LVecBase3) &copy, FLOATTYPE w);
+  INLINE_LINMATH explicit FLOATNAME(LPoint4)(const FLOATNAME(LVecBase3) &copy, FLOATTYPE w);
 
   PY_EXTENSION(INLINE_LINMATH PyObject *__getattr__(PyObject *self, const std::string &attr_name) const);
   PY_EXTENSION(INLINE_LINMATH int __setattr__(PyObject *self, const std::string &attr_name, PyObject *assign));

panda/src/linmath/lquaternion_src.h

@@ -18,7 +18,7 @@ class EXPCL_PANDA_LINMATH FLOATNAME(LQuaternion) : public FLOATNAME(LVecBase4) {
 PUBLISHED:
   INLINE_LINMATH FLOATNAME(LQuaternion)();
   INLINE_LINMATH FLOATNAME(LQuaternion)(const FLOATNAME(LVecBase4) &copy);
-  INLINE_LINMATH FLOATNAME(LQuaternion)(FLOATTYPE r, const FLOATNAME(LVecBase3) &copy);
+  INLINE_LINMATH explicit FLOATNAME(LQuaternion)(FLOATTYPE r, const FLOATNAME(LVecBase3) &copy);
   INLINE_LINMATH FLOATNAME(LQuaternion)(FLOATTYPE r, FLOATTYPE i, FLOATTYPE j, FLOATTYPE k);
 
   static FLOATNAME(LQuaternion) pure_imaginary(const FLOATNAME(LVector3) &v);

panda/src/linmath/lrotation_src.h

@@ -20,10 +20,10 @@ PUBLISHED:
   INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LQuaternion) &c);
   INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LVecBase4) &copy);
   INLINE_LINMATH FLOATNAME(LRotation)(FLOATTYPE r, FLOATTYPE i, FLOATTYPE j, FLOATTYPE k);
-  INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LVector3) &axis, FLOATTYPE angle);
-  INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LMatrix3) &m);
-  INLINE_LINMATH FLOATNAME(LRotation)(const FLOATNAME(LMatrix4) &m);
-  INLINE_LINMATH FLOATNAME(LRotation)(FLOATTYPE h, FLOATTYPE p, FLOATTYPE r);
+  INLINE_LINMATH explicit FLOATNAME(LRotation)(const FLOATNAME(LVector3) &axis, FLOATTYPE angle);
+  INLINE_LINMATH explicit FLOATNAME(LRotation)(const FLOATNAME(LMatrix3) &m);
+  INLINE_LINMATH explicit FLOATNAME(LRotation)(const FLOATNAME(LMatrix4) &m);
+  INLINE_LINMATH explicit FLOATNAME(LRotation)(FLOATTYPE h, FLOATTYPE p, FLOATTYPE r);
 
   INLINE_LINMATH FLOATNAME(LRotation) operator * (FLOATTYPE scalar) const;
   INLINE_LINMATH FLOATNAME(LRotation) operator / (FLOATTYPE scalar) const;

panda/src/linmath/lvector3_src.h

@@ -24,7 +24,7 @@ PUBLISHED:
   INLINE_LINMATH FLOATNAME(LVector3)(const FLOATNAME(LVecBase3) &copy);
   INLINE_LINMATH FLOATNAME(LVector3)(FLOATTYPE fill_value);
   INLINE_LINMATH FLOATNAME(LVector3)(FLOATTYPE x, FLOATTYPE y, FLOATTYPE z);
-  INLINE_LINMATH FLOATNAME(LVector3)(const FLOATNAME(LVecBase2) &copy, FLOATTYPE z);
+  INLINE_LINMATH explicit FLOATNAME(LVector3)(const FLOATNAME(LVecBase2) &copy, FLOATTYPE z);
 
   PY_EXTENSION(INLINE_LINMATH PyObject *__getattr__(PyObject *self, const std::string &attr_name) const);
   PY_EXTENSION(INLINE_LINMATH int __setattr__(PyObject *self, const std::string &attr_name, PyObject *assign));

panda/src/linmath/lvector4_src.h

@@ -20,7 +20,7 @@ PUBLISHED:
   INLINE_LINMATH FLOATNAME(LVector4)(const FLOATNAME(LVecBase4) &copy);
   INLINE_LINMATH FLOATNAME(LVector4)(FLOATTYPE fill_value);
   INLINE_LINMATH FLOATNAME(LVector4)(FLOATTYPE x, FLOATTYPE y, FLOATTYPE z, FLOATTYPE w);
-  INLINE_LINMATH FLOATNAME(LVector4)(const FLOATNAME(LVecBase3) &copy, FLOATTYPE w);
+  INLINE_LINMATH explicit FLOATNAME(LVector4)(const FLOATNAME(LVecBase3) &copy, FLOATTYPE w);
 
   PY_EXTENSION(INLINE_LINMATH PyObject *__getattr__(PyObject *self, const std::string &attr_name) const);
   PY_EXTENSION(INLINE_LINMATH int __setattr__(PyObject *self, const std::string &attr_name, PyObject *assign));

panda/src/mathutil/boundingHexahedron.h

@@ -34,12 +34,12 @@ public:
   INLINE_MATHUTIL BoundingHexahedron();
 
 PUBLISHED:
-  BoundingHexahedron(const LFrustum &frustum, bool is_ortho,
-                     CoordinateSystem cs = CS_default);
-  BoundingHexahedron(const LPoint3 &fll, const LPoint3 &flr,
-                     const LPoint3 &fur, const LPoint3 &ful,
-                     const LPoint3 &nll, const LPoint3 &nlr,
-                     const LPoint3 &nur, const LPoint3 &nul);
+  explicit BoundingHexahedron(const LFrustum &frustum, bool is_ortho,
+                              CoordinateSystem cs = CS_default);
+  explicit BoundingHexahedron(const LPoint3 &fll, const LPoint3 &flr,
+                              const LPoint3 &fur, const LPoint3 &ful,
+                              const LPoint3 &nll, const LPoint3 &nlr,
+                              const LPoint3 &nur, const LPoint3 &nul);
 
 public:
   ALLOC_DELETED_CHAIN(BoundingHexahedron);

panda/src/movies/movieVideo.h

@@ -37,7 +37,7 @@ class BamReader;
  */
 class EXPCL_PANDA_MOVIES MovieVideo : public TypedWritableReferenceCount, public Namable {
 PUBLISHED:
-  MovieVideo(const std::string &name = "Blank Video");
+  explicit MovieVideo(const std::string &name = "Blank Video");
   virtual ~MovieVideo();
   virtual PT(MovieVideoCursor) open();
   static PT(MovieVideo) get(const Filename &name);

panda/src/movies/userDataAudio.h

@@ -31,7 +31,7 @@ class UserDataAudioCursor;
 class EXPCL_PANDA_MOVIES UserDataAudio : public MovieAudio {
 
  PUBLISHED:
-  UserDataAudio(int rate, int channels, bool remove_after_read=true);
+  explicit UserDataAudio(int rate, int channels, bool remove_after_read=true);
   virtual ~UserDataAudio();
   virtual PT(MovieAudioCursor) open();
 

panda/src/ode/odeAMotorJoint.h

@@ -33,8 +33,8 @@ public:
   OdeAMotorJoint(dJointID id);
 
 PUBLISHED:
-  OdeAMotorJoint(OdeWorld &world);
-  OdeAMotorJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeAMotorJoint(OdeWorld &world);
+  explicit OdeAMotorJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdeAMotorJoint();
 
   INLINE void set_num_axes(int num);

panda/src/ode/odeBallJoint.h

@@ -33,8 +33,8 @@ public:
   OdeBallJoint(dJointID id);
 
 PUBLISHED:
-  OdeBallJoint(OdeWorld &world);
-  OdeBallJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeBallJoint(OdeWorld &world);
+  explicit OdeBallJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdeBallJoint();
 
   INLINE void set_anchor(dReal x, dReal y, dReal z);

panda/src/ode/odeBody.h

@@ -38,7 +38,7 @@ public:
   OdeBody(dBodyID id);
 
 PUBLISHED:
-  OdeBody(OdeWorld &world);
+  explicit OdeBody(OdeWorld &world);
   virtual ~OdeBody();
   void destroy();
   INLINE bool is_empty() const;

panda/src/ode/odeBoxGeom.h

@@ -32,8 +32,8 @@ public:
 
 PUBLISHED:
   OdeBoxGeom(dReal lx, dReal ly, dReal lz);
-  OdeBoxGeom(OdeSpace &space, dReal lx, dReal ly, dReal lz);
-  OdeBoxGeom(OdeSpace &space, const LVecBase3f &size);
+  explicit OdeBoxGeom(OdeSpace &space, dReal lx, dReal ly, dReal lz);
+  explicit OdeBoxGeom(OdeSpace &space, const LVecBase3f &size);
   virtual ~OdeBoxGeom();
 
   INLINE void set_lengths(dReal lx, dReal ly, dReal lz);

panda/src/ode/odeCappedCylinderGeom.h

@@ -31,8 +31,8 @@ public:
   OdeCappedCylinderGeom(dGeomID id);
 
 PUBLISHED:
-  OdeCappedCylinderGeom(dReal radius, dReal length);
-  OdeCappedCylinderGeom(OdeSpace &space, dReal radius, dReal length);
+  explicit OdeCappedCylinderGeom(dReal radius, dReal length);
+  explicit OdeCappedCylinderGeom(OdeSpace &space, dReal radius, dReal length);
   virtual ~OdeCappedCylinderGeom();
 
   INLINE void set_params(dReal radius, dReal length);

panda/src/ode/odeContactJoint.h

@@ -34,8 +34,8 @@ public:
   OdeContactJoint(dJointID id);
 
 PUBLISHED:
-  OdeContactJoint(OdeWorld &world, const OdeContact &contact);
-  OdeContactJoint(OdeWorld &world, OdeJointGroup &joint_group, const OdeContact &contact);
+  explicit OdeContactJoint(OdeWorld &world, const OdeContact &contact);
+  explicit OdeContactJoint(OdeWorld &world, OdeJointGroup &joint_group, const OdeContact &contact);
   virtual ~OdeContactJoint();
 
 public:

panda/src/ode/odeCylinderGeom.h

@@ -31,8 +31,8 @@ public:
   OdeCylinderGeom(dGeomID id);
 
 PUBLISHED:
-  OdeCylinderGeom(dReal radius, dReal length);
-  OdeCylinderGeom(OdeSpace &space, dReal radius, dReal length);
+  explicit OdeCylinderGeom(dReal radius, dReal length);
+  explicit OdeCylinderGeom(OdeSpace &space, dReal radius, dReal length);
   virtual ~OdeCylinderGeom();
 
   INLINE void set_params(dReal radius, dReal length);

panda/src/ode/odeFixedJoint.h

@@ -33,8 +33,8 @@ public:
   OdeFixedJoint(dJointID id);
 
 PUBLISHED:
-  OdeFixedJoint(OdeWorld &world);
-  OdeFixedJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeFixedJoint(OdeWorld &world);
+  explicit OdeFixedJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdeFixedJoint();
 
   INLINE void set();

panda/src/ode/odeHinge2Joint.h

@@ -32,8 +32,8 @@ public:
   OdeHinge2Joint(dJointID id);
 
 PUBLISHED:
-  OdeHinge2Joint(OdeWorld &world, OdeJointGroup &joint_group);
-  OdeHinge2Joint(OdeWorld &world);
+  explicit OdeHinge2Joint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeHinge2Joint(OdeWorld &world);
   virtual ~OdeHinge2Joint();
 
   INLINE void set_anchor(dReal x, dReal y, dReal z);

panda/src/ode/odeHingeJoint.h

@@ -32,8 +32,8 @@ public:
   OdeHingeJoint(dJointID id);
 
 PUBLISHED:
-  OdeHingeJoint(OdeWorld &world);
-  OdeHingeJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeHingeJoint(OdeWorld &world);
+  explicit OdeHingeJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdeHingeJoint();
 
   INLINE void set_anchor(dReal x, dReal y, dReal z);

panda/src/ode/odeLMotorJoint.h

@@ -32,8 +32,8 @@ public:
   OdeLMotorJoint(dJointID id);
 
 PUBLISHED:
-  OdeLMotorJoint(OdeWorld &world);
-  OdeLMotorJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeLMotorJoint(OdeWorld &world);
+  explicit OdeLMotorJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdeLMotorJoint();
 
   INLINE void set_num_axes(int num);

panda/src/ode/odeNullJoint.h

@@ -33,8 +33,8 @@ public:
   OdeNullJoint(dJointID id);
 
 PUBLISHED:
-  OdeNullJoint(OdeWorld &world);
-  OdeNullJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeNullJoint(OdeWorld &world);
+  explicit OdeNullJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdeNullJoint();
 
 public:

panda/src/ode/odePlane2dJoint.h

@@ -32,8 +32,8 @@ public:
   OdePlane2dJoint(dJointID id);
 
 PUBLISHED:
-  OdePlane2dJoint(OdeWorld &world);
-  OdePlane2dJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdePlane2dJoint(OdeWorld &world);
+  explicit OdePlane2dJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdePlane2dJoint();
 
   INLINE void set_x_param(int parameter, dReal value);

panda/src/ode/odePlaneGeom.h

@@ -32,8 +32,8 @@ public:
 PUBLISHED:
   OdePlaneGeom(dReal a, dReal b, dReal c, dReal d);
   OdePlaneGeom(const LVecBase4f &params);
-  OdePlaneGeom(OdeSpace &space, dReal a, dReal b, dReal c, dReal d);
-  OdePlaneGeom(OdeSpace &space, const LVecBase4f &params);
+  explicit OdePlaneGeom(OdeSpace &space, dReal a, dReal b, dReal c, dReal d);
+  explicit OdePlaneGeom(OdeSpace &space, const LVecBase4f &params);
   virtual ~OdePlaneGeom();
 
   INLINE void set_params(dReal a, dReal b, dReal c, dReal d);

panda/src/ode/odeQuadTreeSpace.h

@@ -32,13 +32,13 @@ public:
   OdeQuadTreeSpace(dSpaceID id);
 
 PUBLISHED:
-  OdeQuadTreeSpace(const LPoint3f &center,
-                   const LVecBase3f &extents,
-                   const int depth);
-  OdeQuadTreeSpace(OdeSpace &space,
-                   const LPoint3f &center,
-                   const LVecBase3f &extents,
-                   const int depth);
+  explicit OdeQuadTreeSpace(const LPoint3f &center,
+                            const LVecBase3f &extents,
+                            const int depth);
+  explicit OdeQuadTreeSpace(OdeSpace &space,
+                            const LPoint3f &center,
+                            const LVecBase3f &extents,
+                            const int depth);
   virtual ~OdeQuadTreeSpace();
 
 public:

panda/src/ode/odeRayGeom.h

@@ -31,7 +31,7 @@ public:
 
 PUBLISHED:
   OdeRayGeom(dReal length);
-  OdeRayGeom(OdeSpace &space, dReal length);
+  explicit OdeRayGeom(OdeSpace &space, dReal length);
   virtual ~OdeRayGeom();
 
   INLINE void set_length(dReal length);

panda/src/ode/odeSliderJoint.h

@@ -32,8 +32,8 @@ public:
   OdeSliderJoint(dJointID id);
 
 PUBLISHED:
-  OdeSliderJoint(OdeWorld &world);
-  OdeSliderJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeSliderJoint(OdeWorld &world);
+  explicit OdeSliderJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdeSliderJoint();
 
   INLINE void set_axis(dReal x, dReal y, dReal z);

panda/src/ode/odeSphereGeom.h

@@ -31,7 +31,7 @@ public:
 
 PUBLISHED:
   OdeSphereGeom(dReal radius);
-  OdeSphereGeom(OdeSpace &space, dReal radius);
+  explicit OdeSphereGeom(OdeSpace &space, dReal radius);
   OdeSphereGeom(OdeGeom &geom);
   virtual ~OdeSphereGeom();
 

panda/src/ode/odeUniversalJoint.h

@@ -34,8 +34,8 @@ public:
   OdeUniversalJoint(dJointID id);
 
 PUBLISHED:
-  OdeUniversalJoint(OdeWorld &world);
-  OdeUniversalJoint(OdeWorld &world, OdeJointGroup &joint_group);
+  explicit OdeUniversalJoint(OdeWorld &world);
+  explicit OdeUniversalJoint(OdeWorld &world, OdeJointGroup &joint_group);
   virtual ~OdeUniversalJoint();
 
   INLINE void set_anchor(dReal x, dReal y, dReal z);

panda/src/pgraphnodes/spotlight.h

@@ -31,7 +31,7 @@
  */
 class EXPCL_PANDA_PGRAPHNODES Spotlight : public LightLensNode {
 PUBLISHED:
-  Spotlight(const std::string &name);
+  explicit Spotlight(const std::string &name);
 
 protected:
   Spotlight(const Spotlight &copy);

panda/src/physics/angularEulerIntegrator.cxx

@@ -103,7 +103,7 @@ child_integrate(Physical *physical,
     // apply the accumulated torque vector to the object's inertial tensor.
     // this matrix represents how much force the object 'wants' applied to it
     // in any direction, among other things.
-    accum_quat = current_object->get_inertial_tensor() * accum_quat;
+    accum_quat = LRotation(current_object->get_inertial_tensor()) * accum_quat;
 
     // derive this into the angular velocity vector.
     LRotation rot_quat = current_object->get_rotation();

panda/src/pnmimage/pnmImageHeader.h

@@ -118,12 +118,12 @@ PUBLISHED:
     INLINE PixelSpec() = default;
 
   PUBLISHED:
-    INLINE PixelSpec(xelval gray_value);
-    INLINE PixelSpec(xelval gray_value, xelval alpha);
+    INLINE explicit PixelSpec(xelval gray_value);
+    INLINE explicit PixelSpec(xelval gray_value, xelval alpha);
     INLINE PixelSpec(xelval red, xelval green, xelval blue);
     INLINE PixelSpec(xelval red, xelval green, xelval blue, xelval alpha);
     INLINE PixelSpec(const xel &rgb);
-    INLINE PixelSpec(const xel &rgb, xelval alpha);
+    INLINE explicit PixelSpec(const xel &rgb, xelval alpha);
 
     INLINE bool operator < (const PixelSpec &other) const;
     INLINE bool operator == (const PixelSpec &other) const;

panda/src/text/dynamicTextFont.h

@@ -41,7 +41,7 @@ typedef struct hb_font_t hb_font_t;
 class EXPCL_PANDA_TEXT DynamicTextFont : public TextFont, public FreetypeFont {
 PUBLISHED:
   DynamicTextFont(const Filename &font_filename, int face_index = 0);
-  DynamicTextFont(const char *font_data, int data_length, int face_index);
+  explicit DynamicTextFont(const char *font_data, int data_length, int face_index);
   DynamicTextFont(const DynamicTextFont &copy);
   virtual ~DynamicTextFont();