https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66968
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:3dbc7b809a62167b36f217ab5f43207be19e5908 commit r12-2379-g3dbc7b809a62167b36f217ab5f43207be19e5908 Author: Jonathan Wakely <jwak...@redhat.com> Date: Fri Jul 16 20:59:43 2021 +0100 libstdc++: Improve diagnostics for std::get with invalid tuple index This adds a deleted overload of std::get<I>(const tuple<Types...>&). Invalid calls with an out of range index will match the deleted overload and give a single, clear error about calling a deleted function, instead of overload resolution errors for every std::get overload in the library. This changes the current output of 15+ errors (plus notes and associated header context) into just two errors (plus context): error: static assertion failed: tuple index must be in range error: use of deleted function 'constexpr std::__enable_if_t<(__i >= sizeof... (_Types))> std::get(const std::tuple<_Types ...>&) [with long unsigned int __i = 1; _Elements = {int}; std::__enable_if_t<(__i >= sizeof... (_Types))> = void]' This seems like a nice improvement, although PR c++/66968 means that "_Types" is printed in the signature rather than "_Elements". Signed-off-by: Jonathan Wakely <jwak...@redhat.com> libstdc++-v3/ChangeLog: * include/std/tuple (get<I>): Add deleted overload for bad index. * testsuite/20_util/tuple/element_access/get_neg.cc: Adjust expected errors.
