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Alex Rivera
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Let's say we have a test.cpp as follows: class A; class B { private: A mutable& _a; }; Compilation: $> gcc test.cpp test.cpp:6:20: error: reference ‘_a’ cannot be declared ‘mutable’ [-fpermissive] My gcc: $> gcc --version gcc (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1 Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Why?
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