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(gcc-300.info)C++ Misunderstandings

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Common Misunderstandings with GNU C++
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   C++ is a complex language and an evolving one, and its standard
definition (the ISO C++ standard) was only recently completed.  As a
result, your C++ compiler may occasionally surprise you, even when its
behavior is correct.  This section discusses some areas that frequently
give rise to questions of this sort.

Static Definitions

Static member declarations are not definitions

Temporaries

Temporaries may vanish before you expect

Copy Assignment

Copy Assignment operators copy virtual bases twice