固定宽度整数类型的整数文字

Question

对于像这样的固定宽度整数类型，是否有一些整数文字的c建议？

// i's type is unsigned int
auto i = 10u;
// j's type is uint32_t
auto j = 10u32;

Answer 1

是：P1280R0整数宽度文字（发布于2018-10-05）。

它提出了以下文字：

namespace std::inline literals::inline integer_literals {
  constexpr uint64_t operator ""u64 (unsigned long long arg);
  constexpr uint32_t operator ""u32 (unsigned long long arg);
  constexpr uint16_t operator ""u16 (unsigned long long arg);
  constexpr uint8_t operator ""u8 (unsigned long long arg);

  constexpr int64_t operator ""i64 (unsigned long long arg);
  constexpr int32_t operator ""i32 (unsigned long long arg);
  constexpr int16_t operator ""i16 (unsigned long long arg);
  constexpr int8_t operator ""i8 (unsigned long long arg);
}

它的更新版本P1280R1“将返回类型修改为实际为[u]int\u leastXX\t和friends。这是为了确保我们实际替换[u]INTxx\u C宏，因为这些宏返回[u]int\u leastXX\t”：

namespace std::inline literals::inline integer_literals {
  constexpr uint_least64_t operator ""u64 (unsigned long long arg);
  constexpr uint_least32_t operator ""u32 (unsigned long long arg);
  constexpr uint_least16_t operator ""u16 (unsigned long long arg);
  constexpr uint_least8_t operator ""u8 (unsigned long long arg);

  constexpr int_least64_t operator ""i64 (unsigned long long arg);
  constexpr int_least32_t operator ""i32 (unsigned long long arg);
  constexpr int_least16_t operator ""i16 (unsigned long long arg);
  constexpr int_least8_t operator ""i8 (unsigned long long arg);
}

2019-06-12更新P1280R2，使文本consteval而不是constepr。