When adding -Weffc++ to a Qt Creator project file like below, extra compile warnings from 'Effective C++' by Scott Meyers will be given to help you.


QMAKE_CXXFLAGS += -Weffc++

-Weffc++ does not go together smoothly with Qt, however. See -Weffc++ and Qt how to possibly resolve this.

Compile cleanly at high warning levels [1]. Prefer compile errors to runtime errors [2].

How to add the -Weffc++ compiler option in your code?

Add the following line to your code:


#pragma GCC diagnostic warning "-Weffc++"

How to temporarily suppress the -Weffc++ compiler option?

Sometimes suppressing -Weffc++ is the lesser evil (for example when creating a derived class from std::binary_function).

Add the line below to your code to start suppressing the -Weffc++ compile warnings:


#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

//Your code

#pragma GCC diagnostic pop

-Weffc++ does not go together smoothly with Qt, however. See -Weffc++ and Qt how to possibly resolve this.

Herb Sutter, Andrei Alexandrescu. C++ coding standards: 101 rules, guidelines, and best practices. 2005. ISBN: 0-32-111358-6. Item 1: 'Compile cleanly at high warning levels'.
Herb Sutter, Andrei Alexandrescu. C++ coding standards: 101 rules, guidelines, and best practices. ISBN: 0-32-111358-6. Item 14: 'Prefer compile- and link-time errors to run-time errors'.