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* [gcc r9-9383] libstdc++: Fix outdated comment about std::string instantiations (PR 94854)
@ 2021-04-20 18:53 Jonathan Wakely
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From: Jonathan Wakely @ 2021-04-20 18:53 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:8ceccbc3bbbba45ec4bb25ca833d2a6b62d2bb9c
commit r9-9383-g8ceccbc3bbbba45ec4bb25ca833d2a6b62d2bb9c
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Apr 29 18:57:34 2020 +0100
libstdc++: Fix outdated comment about std::string instantiations (PR 94854)
PR libstdc++/94854
* include/bits/basic_string.tcc: Update comment about explicit
instantiations.
Diff:
---
libstdc++-v3/include/bits/basic_string.tcc | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/libstdc++-v3/include/bits/basic_string.tcc b/libstdc++-v3/include/bits/basic_string.tcc
index 314b8fe207f..4c39f9107cf 100644
--- a/libstdc++-v3/include/bits/basic_string.tcc
+++ b/libstdc++-v3/include/bits/basic_string.tcc
@@ -1599,11 +1599,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
#if _GLIBCXX_EXTERN_TEMPLATE
- // The explicit instantiations definitions in src/c++11/string-inst.cc
- // are compiled as C++14, so the new C++17 members aren't instantiated.
- // Until those definitions are compiled as C++17 suppress the declaration,
- // so C++17 code will implicitly instantiate std::string and std::wstring
- // as needed.
+ // The explicit instantiation definitions in src/c++11/string-inst.cc and
+ // src/c++17/string-inst.cc only instantiate the members required for C++17
+ // and earlier standards (so not C++20's starts_with and ends_with).
+ // Suppress the explicit instantiation declarations for C++20, so C++20
+ // code will implicitly instantiate std::string and std::wstring as needed.
# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
extern template class basic_string<char>;
# elif ! _GLIBCXX_USE_CXX11_ABI
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