# static_assert

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< c‎ | error

Defined in header `<assert.h>` |  |
#define static_assert _Static_assert |  |

This convenience macro expands to the keyword _Static_assert

### 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),
                     "this program requires that int is less than char"); // compile-time error
    }

### References

- C11 standard (ISO/IEC 9899:2011):

  - 7.2/3 Diagnostics <assert.h> (p: 186)

### See also

C++ documentation for Static Assertion

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