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Make C++20 features optional

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- Some compilers with C++20 dont have std::popcount
- Support to toggle C++20 features from user side using new VMA_CPP20 macro. If the macro is not defined, it will be set using default logic - #if __cplusplus >= 202002L || _MSVC_LANG >= 202002L
This commit is contained in:
manaskulkarni 2023-09-01 14:10:40 +05:30
parent e88fff957b
commit 66bb67cf18
1 changed files with 10 additions and 2 deletions
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12
include/vk_mem_alloc.h
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@ -2624,10 +2624,18 @@ VMA_CALL_PRE void VMA_CALL_POST vmaFreeStatsString(
#include <utility>
#include <type_traits>
#if !defined(VMA_CPP20)
#if __cplusplus >= 202002L || _MSVC_LANG >= 202002L // C++20
#define VMA_CPP20 1
#else
#define VMA_CPP20 0
#endif
#endif
#ifdef _MSC_VER
#include <intrin.h> // For functions like __popcnt, _BitScanForward etc.
#endif
#if __cplusplus >= 202002L || _MSVC_LANG >= 202002L // C++20
#if VMA_CPP20
#include <bit> // For std::popcount
#endif
@ -3263,7 +3271,7 @@ But you need to check in runtime whether user's CPU supports these, as some old
*/
static inline uint32_t VmaCountBitsSet(uint32_t v)
{
#if __cplusplus >= 202002L || _MSVC_LANG >= 202002L // C++20
#if VMA_CPP20
return std::popcount(v);
#else
uint32_t c = v - ((v >> 1) & 0x55555555);