在 2020/12/17 3:08, Biswapriyo Nath 写道: > +#define DIRECTX_MATH_VERSION 314 > + > +#define XM_CONST const > +#define XM_CONSTEXPR
This can be defined as:
```c++
#if __cplusplus >= 201103L
# define XM_CONSTEXPR constexpr
#else
# define XM_CONSTEXPR
#endif
```
> +__declspec(align(16)) struct XMFLOAT2A : public XMFLOAT2 {
There are a few issues on it:
1. `__declspec()` is a macro that expands to `__attribute__(())` so this
expands to
```
__attribute__((align(16))) struct XMFLOAT2A
```
but I don't recommend use of `__declspec()`; see below.
2. `align` isn't a valid attribute for GCC. It should be `aligned` or
`__aligned__`.
3. The attribute must _follow_ `struct`, otherwise it gets ignored. GCC accepts
the code silently,
but G++ will warn about it:
```
test.c:1:32: warning: attribute ignored in declaration of 'struct foo'
[-Wattributes]
1 | __declspec(aligned(64)) struct foo { int a; };
| ^~~
```
--
Best regards,
LH_Mouse
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