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This patch changes the type of _M_handle member of __format::_Arg_value from __format::_HandleBase union member to basic_format_arg<_Context>::handle. This allows handle to be stored (using placement new) inside _Arg_value at compile time, as type _M_handle member now matches stored object. In addition to above, to make handle usable at compile time, we adjust the _M_func signature to match the stored function, avoiding the need for reinterpret cast. To avoid a cycling dependency, where basic_format_arg<_Context> requires instantiating _Arg_value<_Context> for its _M_val member, that in turn requires basic_format_arg<_Context>::handle, we define handle as nested class inside _Arg_value and change basic_format_arg<_Context>::handle to alias for it. Finally, the handle(_Tp&) constructor is now constrained to not accept handle itself, as otherwise it would be used instead of copy-constructor when constructing from handle&. As _Arg_value is already templated on _Context, this change should not lead to additional template instantiations. libstdc++-v3/ChangeLog: * include/std/format (__Arg_value::handle): Define, extracted with modification from basic_format_arg::handle. (_Arg_value::_Handle_base): Remove. (_Arg_value::_M_handle): Change type to handle. (_Arg_value::_M_get, _Arg_value::_M_set): Check for handle type directly, and return result unmodified. (basic_format_arg::__formattable): Remove. (basic_format_arg::handle): Replace with alias to _Arg_value::handle. Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>
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