assert
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在头文件 <assert.h> 中定义
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#ifdef NDEBUG #define assert(condition) ((void)0) |
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依赖于另一个宏,
assert
,这是没有定义的标准库中定义的宏NDEBUG.原文:
The definition of the macro
assert
depends on another macro, NDEBUG, which is not defined by the standard library.NDEBUG是
<assert.h>
是包括在源代码中的点定义为宏的名称,然后assert
一无所有原文:
If NDEBUG is defined as a macro name at the point in the source code where
<assert.h>
is included, then assert
does nothing.NDEBUG没有定义,然后
assert
检查,如果其参数(必须有标量类型)比较等于零。如果是的话,assert
输出实现特定的标准错误输出的诊断信息,并调用abort()。需要的诊断信息,包括文本expression
,以及价值观的标准宏__FILE__,__LINE__和标准的变量__func__.原文:
If NDEBUG is not defined, then
assert
checks if its argument (which must have scalar type) compares equal to zero. If it does, assert
outputs implementation-specific diagnostic information on the standard error output and calls abort(). The diagnostic information is required to include the text of expression
, as well as the values of the standard macros __FILE__, __LINE__, and the standard variable __func__.目录 |
[编辑] 参数
condition | - | 标量类型的表达
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[编辑] 返回值
(无)
[编辑] 示例
#include <stdio.h> #include <assert.h> int main (int argc, char **argv) { // Test if 0 is really equivalent to 0 assert (0 == 0); // Test if 1 is different than 0... assert (1 == 0); return 0; }
输出:
example: ex.c:10: int main(int, char**): Assertion `1 == 0' failed. Aborted
[编辑] 另请参阅
引发非正常的程序终止(不清理) (函数) |