assert

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C++
 
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Assertions
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assert
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Defined in header <cassert>
#ifdef NDEBUG

#define assert(condition) ((void)0)
#else
#define assert(condition) /*implementation defined*/

#endif
依赖于另一个宏，assert，这是没有定义的标准库中定义的宏NDEBUG.
Original:
The definition of the macro assert depends on another macro, NDEBUG, which is not defined by the standard library.
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NDEBUG是<cassert>是包括在源代码中的点定义为宏的名称，然后assert一无所有
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If NDEBUG is defined as a macro name at the point in the source code where <cassert> is included, then assert does nothing.
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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std::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__.
Original:
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 std::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__.
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目录

[编辑] 参数

condition -
标量类型的表达
Original:
expression of scalar type
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[编辑] 返回值

（无）
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(none)
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[编辑] 为例

#include <iostream>
// uncomment to disable assert()
// #define NDEBUG
#include <cassert>
 
int main()
{
    assert(2+2==4);
    std::cout << "Execution continues past the first assert\n";
    assert(2+2==5);
    std::cout << "Execution continues past the second assert\n";
}

Output: 

Execution continues past the first assert
test: test.cc:8: int main(): Assertion `2+2==5' failed.
Aborted

[编辑] 另请参阅

静态断言
检查（C++11 起）进行编译时断言
Original:
performs compile-time assertion checking （C++11 起）
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[edit]
导致程序异常终止（不清洗）
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causes abnormal program termination (without cleaning up)
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（函数） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/error/assert&oldid=27309”