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@@ -100,6 +100,9 @@
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* C++17 functionality
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* EA_COMPILER_NO_INLINE_VARIABLES
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* EA_COMPILER_NO_ALIGNED_NEW
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+ *
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+ * C++20 functionality
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+ * EA_COMPILER_NO_DESIGNATED_INITIALIZERS
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*
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*-----------------------------------------------------------------------------
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*
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@@ -300,6 +303,26 @@
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#endif
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+ // EA_COMPILER_CPP20_ENABLED
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+ //
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+ // Defined as 1 if the compiler has its available C++20 support enabled, else undefined.
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+ // This does not mean that all of C++20 or any particular feature of C++20 is supported
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+ // by the compiler. It means that whatever C++20 support the compiler has is enabled.
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+ //
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+ // We cannot use (__cplusplus >= 202003L) alone because some compiler vendors have
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+ // decided to not define __cplusplus like thus until they have fully completed their
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+ // C++20 support.
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+ #if !defined(EA_COMPILER_CPP20_ENABLED) && defined(__cplusplus)
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+ // TODO(rparoin): enable once a C++20 value for the __cplusplus macro has been published
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+ // #if (__cplusplus >= 202003L)
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+ // #define EA_COMPILER_CPP20_ENABLED 1
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+ // #elif defined(_MSVC_LANG) && (_MSVC_LANG >= 202003L) // C++20+
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+ // #define EA_COMPILER_CPP20_ENABLED 1
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+ // #endif
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+ #endif
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+
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+
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+
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#if defined(__ARMCC_VERSION)
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// Note that this refers to the ARM RVCT compiler (armcc or armcpp), but there
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// are other compilers that target ARM processors, such as GCC and Microsoft VC++.
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@@ -1290,6 +1313,24 @@
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#endif
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+ // EA_COMPILER_NO_DESIGNATED_INITIALIZERS
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+ //
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+ // Indicates the target compiler supports the C++20 "designated initializer" language feature.
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+ // https://en.cppreference.com/w/cpp/language/aggregate_initialization
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+ //
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+ // Example:
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+ // struct A { int x; int y; };
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+ // A a = { .y = 42, .x = 1 };
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+ //
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+ #if !defined(EA_COMPILER_NO_DESIGNATED_INITIALIZERS)
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+ #if defined(EA_COMPILER_CPP20_ENABLED)
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+ // supported.
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+ #else
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+ #define EA_COMPILER_NO_DESIGNATED_INITIALIZERS 1
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+ #endif
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+ #endif
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+
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+
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// EA_COMPILER_NO_NONSTATIC_MEMBER_INITIALIZERS
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//
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// Refers to C++11 declaration attribute: carries_dependency.
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Roberto Parolin