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[v3] make std::ignore const
- From: Jonathan Wakely <jwakely dot gcc at gmail dot com>
- To: "libstdc++" <libstdc++ at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 11 Jun 2010 16:03:13 +0100
- Subject: [v3] make std::ignore const
The FCD requires std::ignore to be a const instance of some
unspecified type, which the patch below implements by making
_Swallow_assign::operator= work on const objects.
The unnamed namespace is not needed because namespace-scope const
objects are static by default.
Test x86_64/Linux and committed to trunk.
* include/std/tuple (_Swallow_assign::operator=): Add const.
(ignore): Replace anonymous namespace member with const instance.
Index: include/std/tuple
===================================================================
--- include/std/tuple ? (revision 160324)
+++ include/std/tuple ? (working copy)
@@ -690,16 +690,12 @@ namespace std
? struct _Swallow_assign
? {
? ? template<class _Tp>
- ? ? ?_Swallow_assign&
- ? ? ?operator=(const _Tp&)
+ ? ? ?const _Swallow_assign&
+ ? ? ?operator=(const _Tp&) const
? ? ? { return *this; }
? };
- ?// TODO: Put this in some kind of shared file.
- ?namespace
- ?{
- ? ?_Swallow_assign ignore;
- ?}; // anonymous namespace
+ ?const _Swallow_assign ignore{};
? /**
? ?* Stores a tuple of indices. Used by bind() to extract the elements