Error directive

From Cppreference

C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
C++ language
Preprocessor
#if #ifdef #ifndef #else #elif #endif #define #undef #include #warning #error #pragma #line

Shows given message and renders program ill-formed.

[edit] Syntax

#error error_message

[edit] Explanation

After encountering #error directive, diagnostic message error_message is shown and the program is rendered ill-formed (the compilation is stopped).

error_message can consist of several words not necessarily in quotes.

[edit] See also

warning directive