libstdc++: Fix outdated comment about std::string instantiations (PR 94854)
PR libstdc++/94854 * include/bits/basic_string.tcc: Update comment about explicit instantiations.
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2020-04-29 Jonathan Wakely <jwakely@redhat.com>
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PR libstdc++/94854
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* include/bits/basic_string.tcc: Update comment about explicit
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instantiations.
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2020-04-28 Jonathan Wakely <jwakely@redhat.com>
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PR libstdc++/91480
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@ -1609,11 +1609,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Inhibit implicit instantiations for required instantiations,
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// which are defined via explicit instantiations elsewhere.
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#if _GLIBCXX_EXTERN_TEMPLATE
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// The explicit instantiations definitions in src/c++11/string-inst.cc
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// are compiled as C++14, so the new C++17 members aren't instantiated.
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// Until those definitions are compiled as C++17 suppress the declaration,
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// so C++17 code will implicitly instantiate std::string and std::wstring
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// as needed.
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// The explicit instantiation definitions in src/c++11/string-inst.cc and
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// src/c++17/string-inst.cc only instantiate the members required for C++17
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// and earlier standards (so not C++20's starts_with and ends_with).
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// Suppress the explicit instantiation declarations for C++20, so C++20
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// code will implicitly instantiate std::string and std::wstring as needed.
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# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
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extern template class basic_string<char>;
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# elif ! _GLIBCXX_USE_CXX11_ABI
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