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libstdc++: Add default template argument to basic_istream_view 

The standard shows this default template argument in the <ranges>
synopsis, but it was missing in libstdc++.

libstdc++-v3/ChangeLog:

	* include/std/ranges (basic_istream_view): Add default template
	argument.
	* testsuite/std/ranges/istream_view.cc: Check it.
This commit is contained in:
Jonathan Wakely 2021-08-23 16:16:05 +01:00
parent fedadb60b6
commit 1a129376bb
2 changed files with 12 additions and 1 deletions
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3
libstdc++-v3/include/std/ranges
View File

@ -679,7 +679,8 @@ namespace views
= requires(basic_istream<_CharT, _Traits>& is, _Val& t) { is >> t; };
} // namespace __detail
template<movable _Val, typename _CharT, typename _Traits>
template<movable _Val, typename _CharT,
typename _Traits = char_traits<_CharT>>
requires default_initializable<_Val>
&& __detail::__stream_extractable<_Val, _CharT, _Traits>
class basic_istream_view

10
libstdc++-v3/testsuite/std/ranges/istream_view.cc
View File

@ -94,6 +94,15 @@ test05()
;
}
void
test06()
{
// Default template argument
using V = std::ranges::basic_istream_view<int, char>;
using W = std::ranges::basic_istream_view<int, char, std::char_traits<char>>;
static_assert( std::is_same_v<V, W> );
}
int
main()
{
@ -102,4 +111,5 @@ main()
test03();
test04();
test05();
test06();
}