assert
Defined in header
<cassert>
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#ifdef NDEBUG
#define assert(condition) ((void)0) |
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The definition of the macro assert
depends on another macro, NDEBUG, which is not defined by the standard library.
If NDEBUG is defined as a macro name at the point in the source code where <cassert>
is included, then assert
does nothing.
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__.
Contents |
[edit] Parameters
condition | - | expression of scalar type |
[edit] Return value
(none)
[edit] Example
Possible output:
Execution continues past the first assert test: test.cc:10: int main(): Assertion `2+2==5' failed. Aborted
[edit] See also
static assertion | performs compile-time assertion checking (since C++11) |
causes abnormal program termination (without cleaning up) (function) |
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C documentation for assert
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