Hi,
> On 11/05/2010 09:03 PM, Gabriel Dos Reis wrote:
>> I'm looking into std::bitset with respect to constexpr issue.
>> My understanding has always been that one can use the
>> syntax `member()' to value-initialize an array data member
>> `member'.
> I believe so.
Thanks Gaby and Jason.
I wanted to apply the below patch, which seems correct to me in the
light of your exchange and triggered ICEs, for
23_containers/bitset/cons/constexpr.cc for example I got:
In file included from
/home/paolo/Gcc/svn-dirs/trunk/libstdc++-v3/testsuite/23_containers/bitset/cons/constexpr.cc:21:0:
/home/paolo/Gcc/svn-dirs/trunk-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/bitset:
In constructor 'constexpr std::_Base_bitset<_Nw>::_Base_bitset() [with
long unsigned int _Nw = 4ul]':
/home/paolo/Gcc/svn-dirs/trunk-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/bitset:814:7:
instantiated from 'constexpr std::bitset<_Nb>::bitset() [with long
unsigned int _Nb = 256ul]'
/home/paolo/Gcc/svn-dirs/trunk/libstdc++-v3/testsuite/util/testsuite_common_types.h:627:20:
instantiated from 'void
__gnu_test::constexpr_default_constructible::operator()()::_Concept::__constraint()
[with _Tp = std::bitset<256ul>]'
/home/paolo/Gcc/svn-dirs/trunk/libstdc++-v3/testsuite/util/testsuite_common_types.h:631:17:
instantiated from 'void
__gnu_test::constexpr_default_constructible::operator()() [with _Tp =
std::bitset<256ul>]'
/home/paolo/Gcc/svn-dirs/trunk/libstdc++-v3/testsuite/23_containers/bitset/cons/constexpr.cc:29:38:
instantiated from here
/home/paolo/Gcc/svn-dirs/trunk-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/bitset:76:18:
internal compiler error: in build_data_member_initialization, at
cp/semantics.c:5499
Can you have a look?
Thanks,
Paolo.
//////////////////////
Index: include/std/bitset
===================================================================
--- include/std/bitset (revision 166384)
+++ include/std/bitset (working copy)
@@ -72,9 +72,10 @@
/// 0 is the least significant word.
_WordT _M_w[_Nw];
-#ifdef __GXX_EXPERIMENTAL_CXX0X__
- constexpr _Base_bitset() : _M_w({ }) { }
+ _GLIBCXX_CONSTEXPR _Base_bitset()
+ : _M_w() { }
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
constexpr _Base_bitset(unsigned long long __val)
: _M_w({ _WordT(__val)
#if __SIZEOF_LONG_LONG__ > __SIZEOF_LONG__
@@ -82,14 +83,9 @@
#endif
}) { }
#else
- _Base_bitset()
- { _M_do_reset(); }
-
_Base_bitset(unsigned long __val)
- {
- _M_do_reset();
- _M_w[0] = __val;
- }
+ : _M_w()
+ { _M_w[0] = __val; }
#endif
static _GLIBCXX_CONSTEXPR size_t
