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Jonathan Wakely 97271bd88f P0935R0 Eradicating unnecessarily explicit default constructors 
This is the last remaining piece of P0935R0. This adds a default
constructor to each of the streambuf and stream types in <sstream> so
that default construction does not use the 'explicit' constructor that
has a single, defaulted argument.

	P0935R0 Eradicating unnecessarily explicit default constructors
	* config/abi/pre/gnu.ver: Tighten existing patterns and export new
	default constructor symbols.
	* include/std/sstream (basic_stringbuf, basic_istringstream)
	(basic_ostringstream, basic_stringstream): Remove default arguments
	from explicit constructors taking ios_base::openmode and add separate
	non-explicit default constructors.
	* testsuite/27_io/basic_istringstream/cons/default.cc: New.
	* testsuite/27_io/basic_ostringstream/cons/default.cc: New.
	* testsuite/27_io/basic_stringstream/cons/default.cc: New.
	* testsuite/27_io/basic_stringbuf/cons/char/default.cc: New.
	* testsuite/27_io/basic_stringbuf/cons/wchar_t/default.cc: New.

From-SVN: r262474
 		2018-07-06 13:39:02 +01:00
..
backward P0935R0 Eradicating unnecessarily explicit default constructors 2018-06-14 15:12:24 +01:00
bits PR libstdc++/58265 add noexcept to basic_string::assign(basic_string&&) 2018-07-05 18:03:05 +01:00
c Update copyright years. 2018-01-03 11:03:58 +01:00
c_compatibility Update copyright years. 2018-01-03 11:03:58 +01:00
c_global PR libstdc++/85729 add linkage specifications to headers 2018-05-10 13:35:45 +01:00
c_std Update copyright years. 2018-01-03 11:03:58 +01:00
debug re PR libstdc++/86272 (__gnu_debug::string uses undefined __glibcxx_check_insert_range2) 2018-07-04 18:13:11 +00:00
decimal Update copyright years. 2018-01-03 11:03:58 +01:00
experimental Add experimental::sample and experimental::shuffle from N4531 2018-06-25 17:23:49 +01:00
ext LWG 3035. std::allocator's constructors should be constexpr 2018-06-18 16:47:07 +01:00
parallel Update copyright years. 2018-01-03 11:03:58 +01:00
precompiled P0556R3 Integral power-of-2 operations, P0553R2 Bit operations 2018-07-03 22:04:45 +01:00
profile Update copyright years. 2018-01-03 11:03:58 +01:00
std P0935R0 Eradicating unnecessarily explicit default constructors 2018-07-06 13:39:02 +01:00
tr1 PR libstdc++/83140 - assoc_legendre returns negated value when m is odd 2018-05-10 13:59:52 +00:00
tr2 Update copyright years. 2018-01-03 11:03:58 +01:00
Makefile.am P0556R3 Integral power-of-2 operations, P0553R2 Bit operations 2018-07-03 22:04:45 +01:00
Makefile.in P0556R3 Integral power-of-2 operations, P0553R2 Bit operations 2018-07-03 22:04:45 +01:00