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If one of the strings has an encoding prefix and the other doesn't, the one that doesn't will be considered to have the same encoding prefix as the other.
L"Δx = %" PRId16 // at phase 4, PRId16 expands to "d"
// at phase 6, L"Δx = %" and "d" form L"Δx = %d"
If a UTF-8 string literal and a wide string literal are side by side, the program is ill-formed.
为什么 PRId16 扩展为 d？这是在哪里定义的？
最佳答案
在 C99(及以后)语言标准中，作为 <inttypes.h> 的一部分:
[7.8.1] Each of the following object-like macros expands to a character string literal containing a conversion specifier, possibly modified by a length modifier, suitable for use within the format argument of a formatted input/output function when converting the corresponding integer type. These macro names have the general form of
PRI[...]
参见 here供在线引用。
C++标准继承了C的标准库，所以以上可以在<cinttypes>中找到.
关于c++ - PRId16 扩展到 d，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44279873/