Declaration and definition in C++

Discussion in 'C++' started by hkp819, Jan 7, 2009.

  1. hkp819

    hkp819 New Member

    Dec 4, 2008
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    A declaration introduces a name into the program; a definition provides a unique description of an entity (e.g. type, instance, and function). Declarations can be repeated in a given scope, it introduces a name in a given scope. There must be exactly one definition of every object, function or class used in a C++ program.
    A declaration is a definition unless:

    * it declares a function without specifying its body,
    * it contains an extern specifier and no initializer or function body,
    * it is the declaration of a static class data member without a class definition,
    * it is a class name definition,
    * it is a typedef declaration.

    A definition is a declaration unless:

    * it defines a static class data member,
    * it defines a non-inline member function.

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