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Added BX_OFFSETOF.

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Бранимир Караџић
2022-08-25 20:01:07 -07:00
parent d4403099f9
commit dbafa143d9
3 changed files with 50 additions and 0 deletions
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12
include/bx/bx.h
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@@ -21,6 +21,10 @@
///
#define BX_COUNTOF(_x) sizeof(bx::CountOfRequireArrayArgumentT(_x) )
///
#define BX_OFFSETOF(_type, _member) \
(reinterpret_cast<ptrdiff_t>(&(reinterpret_cast<_type*>(16)->_member) )-ptrdiff_t(16) )
///
#if BX_COMPILER_MSVC
# define BX_IGNORE_C4127(_x) bx::ignoreC4127(!!(_x) )
@@ -45,6 +49,14 @@ namespace bx
template <class Ty>
const Ty* addressOf(const Ty& _a);
///
template<typename Ty>
Ty* addressOf(void* _ptr, ptrdiff_t _offset);
///
template<typename Ty>
const Ty* addressOf(const void* _ptr, ptrdiff_t _offset);
/// Swap two values.
template<typename Ty>
void swap(Ty& _a, Ty& _b);

12
include/bx/inline/bx.inl
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@@ -53,6 +53,18 @@ namespace bx
);
}
template<typename Ty>
inline Ty* addressOf(void* _ptr, ptrdiff_t _offset)
{
return (Ty*)( (uint8_t*)_ptr + _offset);
}
template<typename Ty>
inline const Ty* addressOf(const void* _ptr, ptrdiff_t _offset)
{
return (const Ty*)( (const uint8_t*)_ptr + _offset);
}
template<typename Ty>
inline void swap(Ty& _a, Ty& _b)
{

26
tests/macros_test.cpp
View File

@@ -47,4 +47,30 @@ TEST(macros)
CHECK_EQUAL(6, BX_VA_ARGS_COUNT(1, 2, 3, 4, 5, 6) );
CHECK_EQUAL(0, bx::strCmp(BX_STRINGIZE(TEST 1234 %^&*), "TEST 1234 %^&*") );
{
struct PodStruct { int32_t x, y, z; };
CHECK_EQUAL(0, BX_OFFSETOF(PodStruct, x) );
CHECK_EQUAL(4, BX_OFFSETOF(PodStruct, y) );
CHECK_EQUAL(8, BX_OFFSETOF(PodStruct, z) );
}
{
union PodUnion { int32_t x, y, z; };
CHECK_EQUAL(BX_OFFSETOF(PodUnion, x), BX_OFFSETOF(PodUnion, y) );
CHECK_EQUAL(BX_OFFSETOF(PodUnion, y), BX_OFFSETOF(PodUnion, z) );
}
{
struct NonPodStruct { NonPodStruct() { } int32_t x, y, z; };
CHECK_EQUAL(0, BX_OFFSETOF(NonPodStruct, x) );
CHECK_EQUAL(4, BX_OFFSETOF(NonPodStruct, y) );
CHECK_EQUAL(8, BX_OFFSETOF(NonPodStruct, z) );
}
{
union NonPodUnion { NonPodUnion() { } int32_t x, y, z; };
CHECK_EQUAL(BX_OFFSETOF(NonPodUnion, x), BX_OFFSETOF(NonPodUnion, y) );
CHECK_EQUAL(BX_OFFSETOF(NonPodUnion, y), BX_OFFSETOF(NonPodUnion, z) );
}
}