static_assert
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C
Concurrency support (C11)
Error handling
Error codes
Assertions
static_assert
(C11)(removed in C23)
Bounds checking
(C11)
(C11)
(C11)
Defined in header
<assert.h>
#define static_assert _Static_assert
(since C11) (removed in C23)
This convenience macro expands to the keyword _Static_assert.
Contents
[edit] Example
Run this code
#include <assert.h> int main(void) { static_assert(2 + 2 == 4, "2+2 isn't 4"); // well-formed static_assert(sizeof(int) < sizeof(char), // compile-time error "this program requires that int is less than char"); }
[edit] Notes
Since C23, static_assert is itself a keyword, which may also be a predefined macro, so <assert.h> no longer provides it.
[edit] References
- C23 standard (ISO/IEC 9899:2024):
- 7.2/3 Diagnostics <assert.h> (p: TBD)
- C17 standard (ISO/IEC 9899:2018):
- 7.2/3 Diagnostics <assert.h> (p: 135)
- C11 standard (ISO/IEC 9899:2011):
- 7.2/3 Diagnostics <assert.h> (p: 186)
[edit] See also
C++ documentation for Static Assertion