[Bug c++/66670] "template argument deduction/substitution failed" with function pointers and multiple parameter packs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66670
schlaffi at users dot sourceforge.net changed:
What|Removed |Added
CC||schlaffi at users dot
sourceforge.
||net
--- Comment #3 from schlaffi at users dot sourceforge.net ---
This still affects g++ 9.2.1.
clang fixed this between 6.0.0 and 7.0.0, icc 13 and msvc 19 also work.
This has nothing to do with class functions:
static void foo( int, int ) { }
template
void bar1( void ( * )( int, T... ) ) { }
template
void bar2( void ( * )( T..., int ) ) { }
int main() {
bar1( foo );
bar2( foo );
}
Because we have twice "int" in foo, the error message is slightly different:
arg_deduct.cc: In function ‘int main()’:
arg_deduct.cc:11:18: error: no matching function for call to ‘bar2(void
(&)(int, int))’
11 | bar2( foo );
| ^
arg_deduct.cc:7:6: note: candidate: ‘template void bar2(void (*)(T
..., int))’
7 | void bar2( void ( * )( T..., int ) ) { }
| ^~~~
arg_deduct.cc:7:6: note: template argument deduction/substitution failed:
arg_deduct.cc:11:18: note: candidate expects 1 argument, 2 provided
11 | bar2( foo );
| ^
The analogous construction with classes works like charm:
template
struct Foo {};
static Foo foo;
template typename C>
void bar1( C ) {}
template typename C>
void bar2( C ) {}
int main() {
bar1( foo );
bar2( foo );
}
[Bug c++/84045] New: ICE when is_nothrow_default_constructible is used before #include
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84045
Bug ID: 84045
Summary: ICE when is_nothrow_default_constructible is used
before #include
Product: gcc
Version: 7.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: schlaffi at users dot sourceforge.net
Target Milestone: ---
The following valid code
#include
template
struct dummy{
typedef std::is_nothrow_default_constructible dc;
void fu()noexcept(dc::value){}
};
#include
int main(){
std::set bar;
return 0;
}
causes the ICE:
In file included from /usr/include/c++/7/set:60:0,
from ice.cc:9:
/usr/include/c++/7/bits/stl_tree.h: In instantiation of
‘std::_Rb_tree_key_compare<_Key_compare>::_Rb_tree_key_compare() [with
_Key_compare = std::less]’:
ice.cc:12:16: required from here
/usr/include/c++/7/bits/stl_tree.h:146:7: internal compiler error: Segmentation
fault
_Rb_tree_key_compare()
The following changes make the code compile without error:
- include before struct dummy
- force dc::value to be bool (e.g. not not dc::value or bool(dc::value))
- expand the typedef in dc::value
- have only one template parameter
But, it took me quite a while to find what line causes the error.
My gcc is
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object --enable-linker-build-id
--with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin
--enable-initfini-array --with-isl --enable-libmpx
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686
--build=x86_64-redhat-linux
Thread model: posix
gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)
[Bug libstdc++/57674] wrong distribution for std::binomial_distribution::operator()(g,param)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57674 --- Comment #5 from schlaffi at users dot sourceforge.net --- yes, it's fixed :) I tested various examples (also large param.t).
[Bug c++/57679] New: c++11: ICE on template type alias to enum
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57679
Bug ID: 57679
Summary: c++11: ICE on template type alias to enum
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: schlaffi at users dot sourceforge.net
struct B{ enum C{}; };
template using A=typename T::C;
A d;
triggers an ICE:
y.cc:3:4: internal compiler error: Segmentation fault
I would expect that this is even valid code? The "struct B" embedding is not
needed --- I just thought that "using A=T" look very wired. llvm compiles
without complains.
[Bug libstdc++/57674] wrong distribution for std::binomial_distribution::operator()(g,param)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57674 --- Comment #2 from schlaffi at users dot sourceforge.net --- Created attachment 30338 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30338&action=edit corrected version of the example file sorry, forgot one line, the output should be distribution 1: p = 0.8, f = 0.798828 distribution 2: p = 0.3, f = 0.206055 (bad) vs. distribution 1: p = 0.8, f = 0.793945 distribution 2: p = 0.3, f = 0.308594 (good)
[Bug libstdc++/57674] wrong distribution for std::binomial_distribution::operator()(g,param)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57674 schlaffi at users dot sourceforge.net changed: What|Removed |Added Version|4.7.2 |lno --- Comment #1 from schlaffi at users dot sourceforge.net --- i mean v4.7.2 :o
[Bug libstdc++/57674] New: wrong distribution for std::binomial_distribution::operator()(g,param)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57674 Bug ID: 57674 Summary: wrong distribution for std::binomial_distribution::operator()(g,param) Product: gcc Version: 4.7.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: schlaffi at users dot sourceforge.net Created attachment 30337 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30337&action=edit example where bindist(gen,param) fails std::binomial_distribution::operator()(g,param) produces an invalid statistic. It uses the old probability p_old if param.p<.5 and otherwise 1-p_old. Looks like a typo. That is, dist(gen,para2); gives distribution 1: p = 0.8, f = 0.798828 distribution 2: p = 0.3, f = 0.206055 while dist.param(para2);dist(gen); gives distribution 1: p = 0.8, f = 0.324219 distribution 2: p = 0.3, f = 0.295898 I briefly checked the SVN, there does not seem to be a change since v2.7.8.
