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From: "henrik.nortamo at csc dot fi" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/106214] New: Vector template argument deduction fails for
 templated function element
Date: Wed, 06 Jul 2022 12:33:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106214

            Bug ID: 106214
           Summary: Vector template argument deduction fails for templated
                    function element
           Product: gcc
           Version: 11.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: henrik.nortamo at csc dot fi
  Target Milestone: ---

Created attachment 53262
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53262&action=3Dedit
full compiler error message

The following code fails to compile with the command
g++ -Wall -Wextra --std=3Dc++17 minimal.cpp

minimal.cpp
"""
#include <vector>

template<typename T>=20
void foo() {}=20

int main(){
    std::vector V{foo<float>};
    return 0;
}
"""

The error emitted is (full error as an attachment ):

"""
minimal.cpp: In function =E2=80=98int main()=E2=80=99:
minimal.cpp:7:29: error: class template argument deduction failed:
     std::vector V{foo<float>};
                             ^
minimal.cpp:7:29: error: no matching function for call to =E2=80=98vector(<=
unresolved
overloaded function type>)=E2=80=99
In file included from /usr/include/c++/8/vector:64
"""

Tested to fail in the same way for the following g++ versions:

7.4.0=20=20
8.3.0=20=20
8.5.0=20=20
9.1.0=20=20
9.4.0=20=20
11.2.0=20
11.3.0=20

Code compiles using Clang 13.0.0, icpc (ICC) 19.0.4 and=20
"Intel(R) oneAPI DPC++/C++ Compiler 2022.1.0"=