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Next: , Up: Common Misunderstandings with GNU C++ [Contents][Index]

14.7.1 Declare and Define Static Members

When a class has static data members, it is not enough to declare the static member; you must also define it. For example: 

class Foo
-{
-  …
-  void method();
-  static int bar;
-};
-

This declaration only establishes that the class Foo has an int named Foo::bar, and a member function named Foo::method. But you still need to define both method and bar elsewhere. According to the ISO standard, you must supply an initializer in one (and only one) source file, such as: 

int Foo::bar = 0;
-

Other C++ compilers may not correctly implement the standard behavior. As a result, when you switch to g++ from one of these compilers, you may discover that a program that appeared to work correctly in fact does not conform to the standard: g++ reports as undefined symbols any static data members that lack definitions.

-

- © Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
- https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/Static-Definitions.html -

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