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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Compiler Warning (level 4) C4214

Error Message

nonstandard extension used : bit field types other than int

With the default Microsoft extensions (/Ze), bitfield structure members can be of any integer type.

Example

// C4214.c
// compile with: /W4
struct bitfields
{
   unsigned short j:4;  // C4214
};

int main()
{
}

Such bit fields are invalid under ANSI compatibility (/Za).

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