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/GCC 7

5.1 Conditionally-Supported Behavior

Each implementation shall include documentation that identifies all conditionally-supported constructs that it does not support (C++0x 1.4).

  • Whether an argument of class type with a non-trivial copy constructor or destructor can be passed to ... (C++0x 5.2.2).

    Such argument passing is supported, using the same pass-by-invisible-reference approach used for normal function arguments of such types.

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gcc/Conditionally_002dsupported-behavior.html