прервать программу, если утверждение ложно (abort the program if assertion is false)
Имя (Name)
assert - abort the program if assertion is false
Синопсис (Synopsis)
#include <assert.h>
void assert(scalar expression);
Описание (Description)
This macro can help programmers find bugs in their programs, or
handle exceptional cases via a crash that will produce limited
debugging output.
If expression is false (i.e., compares equal to zero), assert()
prints an error message to standard error and terminates the
program by calling abort(3). The error message includes the name
of the file and function containing the assert() call, the source
code line number of the call, and the text of the argument;
something like:
prog: some_file.c:16: some_func: Assertion `val == 0' failed.
If the macro NDEBUG is defined at the moment <assert.h> was last
included, the macro assert() generates no code, and hence does
nothing at all. It is not recommended to define NDEBUG if using
assert() to detect error conditions since the software may behave
non-deterministically.
Возвращаемое значение (Return value)
No value is returned.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│assert() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008, C89, C99. In C89, expression is
required to be of type int and undefined behavior results if it
is not, but in C99 it may have any scalar type.
Ошибки (баги) (Bugs)
assert() is implemented as a macro; if the expression tested has
side-effects, program behavior will be different depending on
whether NDEBUG is defined. This may create Heisenbugs which go
away when debugging is turned on.
Смотри также (See also)
abort(3), assert_perror(3), exit(3)
