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# PR_STATIC_ASSERT
Prevents code from compiling when an expression has the value `FALSE`
at compile time.
## Syntax
```{code}
#include <prlog.h>
PR_STATIC_ASSERT ( expression );
```
### Parameters
The macro has this parameter:
expression
: Any valid expression which evaluates at compile-time to `TRUE` or
`FALSE`. An expression which cannot be evaluated at compile time
will cause a compiler error; see {ref}`PR_ASSERT` for a runtime
alternative.
### Returns
Nothing
## Description
This macro evaluates the specified expression. When the result is zero
(`FALSE`) program compilation will fail with a compiler error;
otherwise compilation completes successfully. The compiler error will
include the number of the line for which the compile-time assertion
failed.
This macro may only be used in locations where an `extern` function
declaration may be used.