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.
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https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gcc/C_002b_002b-Misunderstandings.html