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mdbx++: more songs&dances about constexpr for old/mad compilers.

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Change-Id: I00d7629ea9009b918f687f1e2a9f5ca8adba5ac2
This commit is contained in:
Leonid Yuriev
2020-09-13 18:59:33 +03:00
parent 6c70a7fe11
commit 1bc49f680d
2 changed files with 202 additions and 160 deletions
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35
mdbx.h
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@@ -389,12 +389,35 @@ typedef mode_t mdbx_mode_t;
#endif
#endif /* cxx17_noexcept */
/* Workaround for old compilers without properly support for constexpr. */
#if !defined(cxx07_constexpr)
#if !defined(__cplusplus)
#define cxx07_constexpr __inline
#define cxx07_constexpr_var const
#elif !defined(__cpp_constexpr) || __cpp_constexpr < 200704L || \
(defined(__LCC__) && __LCC__ < 124) || \
(defined(__GNUC__) && __GNUC__ < 5 && !defined(__clang__) && \
!defined(__LCC__)) || \
(defined(_MSC_VER) && _MSC_VER < 1910) || \
(defined(__clang__) && __clang_major__ < 4)
#define cxx07_constexpr inline
#define cxx07_constexpr_var const
#else
#define cxx07_constexpr constexpr
#define cxx07_constexpr_var constexpr
#endif
#endif /* cxx07_constexpr */
#if !defined(cxx11_constexpr)
#if !defined(__cplusplus)
#define cxx11_constexpr __inline
#define cxx11_constexpr_var const
#elif !defined(__cpp_constexpr) || __cpp_constexpr < 200704L || \
(defined(__LCC__) && __LCC__ < 124)
#elif !defined(__cpp_constexpr) || __cpp_constexpr < 201304 || \
(defined(__LCC__) && __LCC__ < 124) || \
(defined(__GNUC__) && __GNUC__ < 6 && !defined(__clang__) && \
!defined(__LCC__)) || \
(defined(_MSC_VER) && _MSC_VER < 1910) || \
(defined(__clang__) && __clang_major__ < 5)
#define cxx11_constexpr inline
#define cxx11_constexpr_var const
#else
@@ -447,16 +470,16 @@ typedef mode_t mdbx_mode_t;
/// used to define flags (based on Microsoft's DEFINE_ENUM_FLAG_OPERATORS).
#define DEFINE_ENUM_FLAG_OPERATORS(ENUM) \
extern "C++" { \
cxx11_constexpr ENUM operator|(ENUM a, ENUM b) { \
cxx07_constexpr ENUM operator|(ENUM a, ENUM b) { \
return ENUM(std::size_t(a) | std::size_t(b)); \
} \
cxx14_constexpr ENUM &operator|=(ENUM &a, ENUM b) { return a = a | b; } \
cxx11_constexpr ENUM operator&(ENUM a, ENUM b) { \
cxx07_constexpr ENUM operator&(ENUM a, ENUM b) { \
return ENUM(std::size_t(a) & std::size_t(b)); \
} \
cxx14_constexpr ENUM &operator&=(ENUM &a, ENUM b) { return a = a & b; } \
cxx11_constexpr ENUM operator~(ENUM a) { return ENUM(~std::size_t(a)); } \
cxx11_constexpr ENUM operator^(ENUM a, ENUM b) { \
cxx07_constexpr ENUM operator~(ENUM a) { return ENUM(~std::size_t(a)); } \
cxx07_constexpr ENUM operator^(ENUM a, ENUM b) { \
return ENUM(std::size_t(a) ^ std::size_t(b)); \
} \
cxx14_constexpr ENUM &operator^=(ENUM &a, ENUM b) { return a = a ^ b; } \