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This adds the integral overloads of std::to_chars and std::from_chars, including the changes made by P0682R0. Support for floating point types is absent. This uses a number of suggestions from Lars (thanks!) but I might have missed some of his ideas and so could be missing some potential optimizations. An earlier version of the patch was posted in https://gcc.gnu.org/ml/libstdc++/2017-04/msg00025.html * include/Makefile.am: Add new <charconv> header. * include/Makefile.in: Regenerate. * include/precompiled/stdc++.h: Include <charconv>. * include/std/charconv: New file. (to_chars_result, to_chars, from_chars_result, from_chars): Define. * testsuite/20_util/from_chars/1.cc: New test. * testsuite/20_util/from_chars/1_neg.cc: New test. * testsuite/20_util/from_chars/2.cc: New test. * testsuite/20_util/from_chars/requirements.cc: New test. * testsuite/20_util/to_chars/1.cc: New test. * testsuite/20_util/to_chars/1_neg.cc: New test. * testsuite/20_util/to_chars/2.cc: New test. * testsuite/20_util/to_chars/requirements.cc: New test. Tested powerpc64le-linux, committed to trunk.
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