在 2019/1/25 20:52, JonY via Mingw-w64-public 写道:
> On 1/25/19 12:27 PM, Nikolay Sivov wrote:
>> v2: added separate definition for C
>>
>
> No need to repeat the members, you should be able to do something like:
>
> struct DWRITE_FONT_METRICS1
> #ifdef __cplusplus
> : public DWRITE_FONT_METRICS
> #endif
> {
> #ifndef __cplusplus
> UINT16 designUnitsPerEm;
> UINT16 ascent;
> UINT16 descent;
> INT16 lineGap;
> UINT16 capHeight;
> UINT16 xHeight;
> INT16 underlinePosition;
> UINT16 underlineThickness;
> INT16 strikethroughPosition;
> UINT16 strikethroughThickness;
> #endif
> INT16 glyphBoxLeft;
> INT16 glyphBoxTop;
> INT16 glyphBoxRight;This should be the more appropriate solution, because inheritance provides not only those members, but also implicit conversion from `DWRITE_FONT_METRICS1 *` to `DWRITE_FONT_METRICS *`, as well as the ability to `static_cast` from the latter to the former, which is otherwise impossible without `reinterpret_cast`. -- Best regards, LH_Mouse
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