Gcc/10.2.0/gcc/Conditionally 002dsupported-behavior
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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.
