与 stdbool.h C++ 接口
在一个项目中，我在 C++ 和一个使用 stdbool.h 定义的 C 库之间进行交互.
In a project I am interfacing between C++ and a C library that uses stdbool.h defined as such.
#ifndef _STDBOOL_H
#define _STDBOOL_H
/* C99 Boolean types for compilers without C99 support */
/* http://www.opengroup.org/onlinepubs/009695399/basedefs/stdbool.h.html */
#if !defined(__cplusplus)
#if !defined(__GNUC__)
/* _Bool builtin type is included in GCC */
typedef enum { _Bool_must_promote_to_int = -1, false = 0, true = 1 } _Bool;
#endif
#define bool _Bool
#define true 1
#define false 0
#define __bool_true_false_are_defined 1
#endif
#endif
有些结构有 bool 成员.因此，如果我将这些结构之一定义为 C++ 函数中的局部变量并将其传递给 C 函数，则 C++ 和 C 之间的大小不一致，因为 bool 在 C++ 中是一个再见，在 C 中是 4.
Some structures have bool members. So if I have one of these structures defined as local variables within a C++ function and pass it to a C function the sizes are inconsistent between C++ and C as bool is one bye in C++ and 4 in C.
有没有人对如何在不诉诸我目前的解决方案的情况下克服这个问题有任何建议
Does anyone have any advice to how to overcome this without resorting to my current solution which is
//#define bool _Bool
#define bool unsigned char
这违反了 stdbool.h 的 C99 标准
Which is against the C99 standard for stdbool.h
推荐答案
我通过找到符合 C99 标准的 stdbool.h 的更兼容实现找到了我自己问题的答案.
I found the answer to my own question by finding a more compatible implementation of stdbool.h that is compliant with the C99 standard.
#ifndef _STDBOOL_H
#define _STDBOOL_H
#include <stdint.h>
/* C99 Boolean types for compilers without C99 support */
/* http://www.opengroup.org/onlinepubs/009695399/basedefs/stdbool.h.html */
#if !defined(__cplusplus)
#if !defined(__GNUC__)
/* _Bool builtin type is included in GCC */
/* ISO C Standard: 5.2.5 An object declared as
type _Bool is large enough to store
the values 0 and 1. */
/* We choose 8 bit to match C++ */
/* It must also promote to integer */
typedef int8_t _Bool;
#endif
/* ISO C Standard: 7.16 Boolean type */
#define bool _Bool
#define true 1
#define false 0
#define __bool_true_false_are_defined 1
#endif
#endif
这取自 Ada 类库 项目.
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