GCC固定大小的整数 [英] GCC Fixed Size Integers

问题描述

在MSVC ++编译器，可以使用 __ INT8 ， __ INT16 ， __ INT32 和类似的具有特定大小的整数。这是非常有用这就需要像自定义文件格式，硬件控制数据结构等。

On the MSVC++ compiler, one can use the __int8, __int16, __int32 and similar types for integers with specific sizes. This is extremely useful for applications which need to work with low-level data structures like custom file formats, hardware control data structures and the like.

有没有类似的等价我可以GCC编译器？

Is there a similar equivalent I can use on the GCC compiler?

推荐答案

ISO标准C，从C99的标准，增加了标准头＆LT; stdint.h＆GT; 定义这些：

ISO standard C, starting with the C99 standard, adds the standard header <stdint.h> that defines these:

uint8_t  - unsigned 8 bit
int8_t   - signed 8 bit
uint16_t - unsigned 16 bit
int16_t  - signed 16 bit
uint32_t - unsigned 32 bit
int32_t  - signed 32 bit
uint64_t - unsigned 64 bit
int64_t  - signed 64 bit

我使用这些类型的所有的时间。

I use these types all the time.

如果实现支持predefined类型与合适的尺寸和特性（其中大部分做的）。

These types are defined only if the implementation supports predefined types with the appropriate sizes and characteristics (which most do).

＆LT; stdint.h＆GT; 也定义类型与形式的名称（U）int_leastN_t （类型拥有的至少的指定的宽度）和（U）int_fastN_t （下称最快的类型至少有指定的宽度）;这些类型是强制性的。

<stdint.h> also defines types with names of the form (u)int_leastN_t (types that have at least the specified width) and (u)int_fastN_t (the "fastest" types that have at least the specified width); these types are mandatory.

如果您使用的是旧的实现不支持＆LT; stdint.h＆GT; ，你可以滚你自己;一种实现方式是道格格温的Q8。

If you're using an old implementation that doesn't support <stdint.h>, you can roll your own; one implementation is Doug Gwyn's "q8".

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