C_ASSERT macro (winnt.h)

Checks assertions at compile time.

Syntax

void C_ASSERT(
   e
);

Parameters

e

An expression that can be determined at compile time.

Return value

None

Remarks

The C_ASSERT macro is defined as follows.

#define C_ASSERT(e) typedef char __C_ASSERT__[(e)?1:-1]

The following examples demonstrate common types of compile-time assertions.

C_ASSERT (BUFFER_CCH_SIZE <= MAX_PATH);

C_ASSERT (ARRAYSIZE(array1) == ARRAYSIZE(array2));

C_ASSERT (FIELD_OFFSET(STRUCT_DEF, MemberName) == 0x1d4);

C_ASSERT (sizeof(BOOLEAN) == sizeof(UCHAR));

Requirements