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g++ compilation option -Weffc++

The following -W... options is not affected by -Wall.

- -Weffc++ (C++ and Objective-C++ only)
Warn about violations of the following style guidelines from Scott Meyers’ Effective C++ book:

- Item 11: Define a copy constructor and an assignment operator for classes with dynamically allocated memory.
- Item 12: Prefer initialization to assignment in constructors.
- Item 14: Make destructors virtual in base classes.
- Item 15: Have operator= return a reference to *this.
- Item 23: Don’t try to return a reference when you must return an object.

Also warn about violations of the following style guidelines from Scott Meyers’ More Effective C++ book:

- Item 6: Distinguish between prefix and postfix forms of increment and decrement operators.
- Item 7: Never overload &&, ||, or ,.

When selecting this option, be aware that the standard library headers do not obey all of these guidelines; use `grep -v’ to filter out those warnings.

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