C++ U32 类型头文件
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C++ U32 type header
提问by Tiago Costa
I want to use U32type but I can't find the header where it is defined. Does anyone know?
我想使用U32类型，但找不到定义它的标题。有人知道吗？
回答by Seth Carnegie
There is no standard type called U32, but if you #include <cstdint>(stdint.hfor C) you can use std::uint32_t1, a 32 bit unsigned integer, which is (I assume) what you want.
没有称为 的标准类型U32，但是如果您#include <cstdint>（stdint.h对于 C）您可以使用std::uint32_t1，一个 32 位无符号整数，这是（我假设）您想要的。
Here is a list of types in the cstdintheader:
namespace std {
int8_t
int16_t
int32_t
int64_t
int_fast8_t
int_fast16_t
int_fast32_t
int_fast64_t
int_least8_t
int_least16_t
int_least32_t
int_least64_t
intmax_t
intintptr_t
uint8_t
uint16_t
uint32_t
uint64_t
uint_fast8_t
uint_fast16_t
uint_fast32_t
uint_fast64_t
uint_least8_t
uint_least16_t
uint_least32_t
uint_least64_t
uintmax_t
uintintptr_t
}
1Thanks Martinho Fernandes for pointing out that these types are in the namespace std.
1感谢 Martinho Fernandes 指出这些类型在命名空间中std。
回答by Kornel Kisielewicz
While cstdint might be a solution, it's not universal -- MSVC versions before 2010 didn't ship with that one. If writing for multiple platforms you'll need to supply the standard types yourself if MSVC < 2010 is detected. Or use the boost oneif you use boost.
虽然 cstdint 可能是一种解决方案，但它并不通用——2010 年之前的 MSVC 版本没有附带那个。如果为多个平台编写，如果检测到 MSVC < 2010，您需要自己提供标准类型。或者使用升压一个，如果你使用的推动作用。
回答by user46748
U32 is an idiomatic shortcut for an unsigned int. Its common definition is:
U32 是 unsigned int 的惯用快捷方式。它的通用定义是：
typedef unsigned int U32;
But the main reason for its use is to be able to control the actual definition manually. Hope this helps.
但使用它的主要原因是能够手动控制实际定义。希望这可以帮助。
