mirror of git://gcc.gnu.org/git/gcc.git
88b1e41c2d
To satisfy the CopyConstructible requirement a callable object stored in a std::function must behave the same when copied from a const or non-const source. If copying a non-const object doesn't produce an equivalent copy then the behaviour is undefined. But we can make our std::function more tolerant of such objects by ensuring we always copy from a const lvalue. Additionally use an if constexpr statement in the _M_get_pointer function to avoid unnecessary instantiations in the discarded branch. * include/bits/std_function.h (_Base_manager::_M_get_pointer): Use constexpr if in C++17 mode. (_Base_manager::_M_clone(_Any_data&, const _Any_data&, true_type)): Copy from const object. * testsuite/20_util/function/cons/non_copyconstructible.cc: New. From-SVN: r260080 |
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| null_pointer_comparisons.cc | ||