Visual C++ 相当于 GCC 的 __attribute__ ((__packed__))

Visual C++ equivalent of GCC#39;s __attribute__ ((__packed__))(Visual C++ 相当于 GCC 的 __attribute__ ((__packed__)))

问题描述

对于某些编译器，结构体有一个打包说明符，例如 ::

<前>RealView ARM 编译器具有__packed"Gnu C 编译器有__attribute__ ((__packed__))"Visual C++ 没有等效项，它只有#pragma pack(1)"

我需要一些可以放入结构定义的东西.

任何信息/黑客/建议?TIA...

您可以为 GNU GCC 和 MSVC 定义 PACK 如下:

#ifdef __GNUC__#define PACK( __Declaration__ ) __Declaration__ __attribute__((__packed__))#万一#ifdef _MSC_VER#define PACK( __Declaration__ ) __pragma( pack(push, 1) ) __Declaration__ __pragma( pack(pop))#万一

并像这样使用它:

PACK(struct myStruct{一个;国际b;});

For some compilers, there is a packing specifier for structs, for example ::

RealView ARM compiler has "__packed"
Gnu C Compiler has "__attribute__ ((__packed__))"
Visual C++ has no equivalent, it only has the "#pragma pack(1)"

I need something that I can put into the struct definition.

Any info/hack/suggestion ? TIA...

You can define PACK like as follows for GNU GCC and MSVC:

#ifdef __GNUC__
#define PACK( __Declaration__ ) __Declaration__ __attribute__((__packed__))
#endif

#ifdef _MSC_VER
#define PACK( __Declaration__ ) __pragma( pack(push, 1) ) __Declaration__ __pragma( pack(pop))
#endif

And use it like this:

PACK(struct myStruct
{
    int a;
    int b;
});

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