Jonathan Wakely
33de0ffcf0
The std::move_only_function::__param_t alias template attempts to optimize argument passing for the invoker, by passing by rvalue reference for types that are non-trivial or large. However, the precondition for is_trivally_copyable makes it unsuitable for using here, and can cause ODR violations. Just use is_scalar instead, and pass all class types (even small, trivial ones) by value. libstdc++-v3/ChangeLog: * include/bits/mofunc_impl.h (move_only_function::__param_t): Use __is_scalar instead of is_trivially_copyable. * testsuite/20_util/move_only_function/call.cc: Check parameters involving incomplete types.
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