[Bug c++/81486] Class template argument deduction fails with (), succeeds with {}
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81486 Marek Polacek changed: What|Removed |Added Status|ASSIGNED|RESOLVED Resolution|--- |FIXED --- Comment #6 from Marek Polacek --- Done.
[Bug c++/81486] Class template argument deduction fails with (), succeeds with {}
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81486 --- Comment #5 from Marek Polacek --- Author: mpolacek Date: Wed Jan 2 22:39:16 2019 New Revision: 267535 URL: https://gcc.gnu.org/viewcvs?rev=267535=gcc=rev Log: PR c++/81486 - CTAD failing with (). * g++.dg/cpp1z/class-deduction60.C: New test. * g++.dg/cpp1z/class-deduction61.C: New test. Added: trunk/gcc/testsuite/g++.dg/cpp1z/class-deduction60.C trunk/gcc/testsuite/g++.dg/cpp1z/class-deduction61.C Modified: trunk/gcc/testsuite/ChangeLog
[Bug c++/81486] Class template argument deduction fails with (), succeeds with {}
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81486 Marek Polacek changed: What|Removed |Added Status|UNCONFIRMED |ASSIGNED Last reconfirmed||2019-01-02 CC||mpolacek at gcc dot gnu.org Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #4 from Marek Polacek --- The examples now compile with my patch for PR 88631. I'll add them to the testsuite. Thanks for reporting them.
[Bug c++/81486] Class template argument deduction fails with (), succeeds with {}
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81486
Ted Lyngmo changed:
What|Removed |Added
CC||ted at lyncon dot se
--- Comment #3 from Ted Lyngmo ---
A comparison between g++ 8.2 and clang++ 6.0.1
g++ -fsanitize=undefined -std=c++17 -Wall -Wextra -Wshadow -Weffc++ -pedantic
-pedantic-errors -Wc++14-compat -Wc++17-compat -c test.cpp
clang++ -fsanitize=undefined -std=c++17 -Wall -Wextra -Wshadow -Weffc++
-pedantic -pedantic-errors -Wc++14-compat -Wc++17-compat -c test.cpp
#include
std::less lt_g;
std::greater gt_g;
// ok in g++ 8.2
// clang++ 6.0.1:
// error: declaration of variable 'lt' with deduced type 'std::less' requires
an initializer
// error: declaration of variable 'gt' with deduced type 'std::greater'
requires an initializer
auto lt_c = std::less();
auto gt_c = std::greater();
// ok in clang++ 6.0.1
// g++ 8.2:
// error: cannot deduce template arguments for ‘less’ from ()
// error: cannot deduce template arguments for ‘greater’ from ()
auto lt_b = std::less{};
auto gt_b = std::greater{};
// ok in both
[Bug c++/81486] Class template argument deduction fails with (), succeeds with {}
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81486
--- Comment #2 from Vittorio Romeo ---
Here's a snippet that seems to reproduce this bug, even without an explicit
deduction guide:
template
struct foo
{
template
foo(Us...) { }
};
int main()
{
auto f = foo();
}
On godbolt:
https://godbolt.org/g/CgqLq5
[Bug c++/81486] Class template argument deduction fails with (), succeeds with {}
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81486 Benjamin Buch changed: What|Removed |Added CC||benni.buch at gmail dot com --- Comment #1 from Benjamin Buch --- I did run into the same problem.
