#error Directive

Preprocessor directive that produces compiler-time error messages.

#error token-string

Parameters

Item	Description
token-string	Error message. This parameter consists of a series of tokens, such as keywords, constants, or complete statements. The token string is subject to macro expansion.

Remarks

#error directives are most useful for detecting programmer inconsistencies and violation of constraints during preprocessing. When an #error directive is encountered, compilation terminates.

Examples

The following example demonstrates error processing during preprocessing.

#if !defined(__cplusplus)
  #error C++ compiler required.
#endif

See also

Preprocessor Directives (DirectX HLSL)