Compile time message testing constexpr

Asked May 19 '17 at 19:22

Active May 19 '17 at 19:24

Viewed 603 times

Is it possible to print a message when a test on a compile time constexpr evalates true? Something like static_assert without stopping the compiler.

constexpr Application::Mode SETUP_MODE = Application::Debug;

// Can I somehow test if the SETUP_MODE is debug for pragma message?
#pragma message("Application mode is set to Debug!")

static_assert(SETUP_MODE != Application::Debug, 
    "Application mode is set to Debug!"); // Can I somehow just print this message without aborting the compilation?

edited May 19 '17 at 19:24

asked May 19 '17 at 19:22

Adam Hunyadi

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There is no standard mechanism for generating compiler messages that aren't errors. You'll need to rely on implementation specific features. – François Andrieux May 19 '17 at 19:24
This certainly is non standard, so which compiler do you work with? – Zereges May 19 '17 at 19:24
Mostly gcc, sometimes clang – Adam Hunyadi May 19 '17 at 19:25
Related: http://stackoverflow.com/questions/8936063/does-there-exist-a-static-warning – Weak to Enuma Elish May 19 '17 at 19:30
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@JamesRoot I'd say that's actually good enough as a dupe. – πάντα ῥεῖ May 19 '17 at 19:36

Compile time message testing constexpr

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