Fixed issue #285.

include/bx/inline/typetraits.inl

@@ -144,37 +144,37 @@ namespace bx
 	template<typename Ty>
 	inline constexpr bool isEnum()
 	{
-		return __is_enum(Ty);
+		return !!__is_enum(Ty);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isUnion()
 	{
-		return __is_union(Ty);
+		return !!__is_union(Ty);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isAbstract()
 	{
-		return __is_abstract(Ty);
+		return !!__is_abstract(Ty);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isAggregate()
 	{
-		return __is_aggregate(Ty);
+		return !!__is_aggregate(Ty);
 	}
 
 	template<typename BaseT, typename DerivedT>
 	inline constexpr bool isBaseOf()
 	{
-		return __is_base_of(BaseT, DerivedT);
+		return !!__is_base_of(BaseT, DerivedT);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isPolymorphic()
 	{
-		return __is_polymorphic(Ty);
+		return !!__is_polymorphic(Ty);
 	}
 
 	template<typename Ty>
@@ -186,31 +186,31 @@ namespace bx
 	template<typename Ty>
 	inline constexpr bool isClass()
 	{
-		return __is_class(Ty);
+		return !!__is_class(Ty);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isFinal()
 	{
-		return __is_final(Ty);
+		return !!__is_final(Ty);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isEmpty()
 	{
-		return __is_empty(Ty);
+		return !!__is_empty(Ty);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isStandardLayout()
 	{
-		return __is_standard_layout(Ty);
+		return !!__is_standard_layout(Ty);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isTrivial()
 	{
-		return __is_trivial(Ty);
+		return !!__is_trivial(Ty);
 	}
 
 	template<typename Ty>
@@ -224,7 +224,7 @@ namespace bx
 	template<typename Ty, typename FromT>
 	inline constexpr bool isAssignable()
 	{
-		return __is_assignable(Ty, FromT);
+		return !!__is_assignable(Ty, FromT);
 	}
 
 	template<typename Ty>
@@ -248,7 +248,7 @@ namespace bx
 	template<typename Ty, typename FromT>
 	inline constexpr bool isTriviallyAssignable()
 	{
-		return __is_trivially_assignable(Ty, FromT);
+		return !!__is_trivially_assignable(Ty, FromT);
 	}
 
 	template<typename Ty>
@@ -272,7 +272,7 @@ namespace bx
 	template<typename Ty, typename... ArgsT>
 	inline constexpr bool isConstructible()
 	{
-		return __is_constructible(Ty, ArgsT...);
+		return !!__is_constructible(Ty, ArgsT...);
 	}
 
 	template<typename Ty>
@@ -290,7 +290,7 @@ namespace bx
 	template<typename Ty, typename... ArgsT>
 	inline constexpr bool isTriviallyConstructible()
 	{
-		return __is_trivially_constructible(Ty, ArgsT...);
+		return !!__is_trivially_constructible(Ty, ArgsT...);
 	}
 
 	template<typename Ty>
@@ -308,16 +308,16 @@ namespace bx
 	template<typename Ty>
 	inline constexpr bool isTriviallyCopyable()
 	{
-		return __is_trivially_copyable(Ty);
+		return !!__is_trivially_copyable(Ty);
 	}
 
 	template<typename Ty>
 	inline constexpr bool isTriviallyDestructible()
 	{
 #if BX_COMPILER_GCC
-		return __has_trivial_destructor(Ty);
+		return !!__has_trivial_destructor(Ty);
 #else
-		return __is_trivially_destructible(Ty);
+		return !!__is_trivially_destructible(Ty);
 #endif // BX_COMPILER_GCC
 	}
 

include/bx/platform.h

@@ -41,6 +41,12 @@
 #	define BX_CRT_NONE 0
 #endif // BX_CRT_NONE
 
+// Language standard version
+#define BX_LANGUAGE_CPP14 201402L
+#define BX_LANGUAGE_CPP17 201703L
+#define BX_LANGUAGE_CPP20 202002L
+#define BX_LANGUAGE_CPP23 202207L
+
 // Platform
 #define BX_PLATFORM_ANDROID    0
 #define BX_PLATFORM_BSD        0
@@ -439,12 +445,14 @@
 #endif // BX_ARCH_
 
 #if defined(__cplusplus)
-#	if __cplusplus < 201402L
+#	if   __cplusplus < BX_LANGUAGE_CPP14
 #		error "C++14 standard support is required to build."
-#	elif __cplusplus < 201703L
+#	elif __cplusplus < BX_LANGUAGE_CPP17
 #		define BX_CPP_NAME "C++14"
-#	elif __cplusplus < 201704L
+#	elif __cplusplus < BX_LANGUAGE_CPP20
 #		define BX_CPP_NAME "C++17"
+#	elif __cplusplus < BX_LANGUAGE_CPP23
+#		define BX_CPP_NAME "C++20"
 #	else
 // See: https://gist.github.com/bkaradzic/2e39896bc7d8c34e042b#orthodox-c
 #		define BX_CPP_NAME "C++WayTooModern"

tests/typetraits_test.cpp

@@ -655,3 +655,34 @@ TEST_CASE("type-traits isBaseOf", "")
 	STATIC_REQUIRE(!bx::isBaseOf<TestClassDerivedB, TestClassDerivedX >() );
 	STATIC_REQUIRE(!bx::isBaseOf<int32_t,           int32_t           >() );
 }
+
+TEST_CASE("type-traits isAggregate", "")
+{
+	STATIC_REQUIRE( bx::isAggregate<TestClass              >() );
+	STATIC_REQUIRE( bx::isAggregate<TestClassFinal         >() );
+	STATIC_REQUIRE(!bx::isAggregate<TestClassCtor          >() );
+	STATIC_REQUIRE( bx::isAggregate<TestClassMember        >() );
+	STATIC_REQUIRE(!bx::isAggregate<TestClassMemberPrivate >() );
+	STATIC_REQUIRE( bx::isAggregate<TestClassStaticOnly    >() );
+#if __cplusplus < BX_LANGUAGE_CPP20
+	STATIC_REQUIRE( bx::isAggregate<TestClassDefaultCtor   >() );
+#else
+	STATIC_REQUIRE(!bx::isAggregate<TestClassDefaultCtor   >() );
+#endif
+	STATIC_REQUIRE( bx::isAggregate<TestClassDefaultDtor   >() );
+	STATIC_REQUIRE(!bx::isAggregate<TestClassVirtualDtor   >() );
+	STATIC_REQUIRE(!bx::isAggregate<TestClassAbstractBase  >() );
+	STATIC_REQUIRE(!bx::isAggregate<TestClassPolymorphic   >() );
+#if __cplusplus < BX_LANGUAGE_CPP17
+	STATIC_REQUIRE(!bx::isAggregate<TestClassDerivedA      >() );
+	STATIC_REQUIRE(!bx::isAggregate<TestClassDerivedB      >() );
+#else
+	STATIC_REQUIRE( bx::isAggregate<TestClassDerivedA      >() );
+	STATIC_REQUIRE( bx::isAggregate<TestClassDerivedB      >() );
+#endif
+	STATIC_REQUIRE(!bx::isAggregate<TestClassDerivedX      >() );
+	STATIC_REQUIRE( bx::isAggregate<TestUnion              >() );
+	STATIC_REQUIRE( bx::isAggregate<TestUnionEmpty         >() );
+	STATIC_REQUIRE( bx::isAggregate<TestUnion[]            >() );
+	STATIC_REQUIRE( bx::isAggregate<int32_t[]              >() );
+}