https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85883
Bug ID: 85883
Summary: class template argument deduction fails in
new-expression
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: barry.revzin at gmail dot com
Target Milestone: ---
Slightly reduced from https://stackoverflow.com/q/50478019/2069064:
template <typename T1, typename T2>
struct Bar
{
Bar(T1, T2) { }
};
int main()
{
auto x = Bar(1, 2);
auto y = new Bar(3, 4);
}
The declaration of x works, the declaration of y fails with:
<source>: In function 'int main()':
<source>:10:26: error: class template argument deduction failed:
auto y = new Bar(3, 4);
^
<source>:10:26: error: no matching function for call to 'Bar()'
<source>:4:5: note: candidate: 'template<class T1, class T2> Bar(T1, T2)->
Bar<T1, T2>'
Bar(T1, T2) { }
^~~
<source>:4:5: note: template argument deduction/substitution failed:
<source>:10:26: note: candidate expects 2 arguments, 0 provided
auto y = new Bar(3, 4);
^
