| Issue |
131708
|
| Summary |
[clang] no viable conversion from '_Bind_front_t<int (&)(int), int>' (aka '_Bind_front<int (*)(int), int>') to 'std::function<int ()>'
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
vient
|
Clang 20.1.0, GCC 14.2
```cpp
#include <functional>
int f(int x) {
return x;
}
int main() {
std::function<int()> fn = std::bind_front(f, 0);
return fn();
}
```
results in
```
<source>:8:24: error: no viable conversion from '_Bind_front_t<int (&)(int), int>' (aka '_Bind_front<int (*)(int), int>') to 'std::function<int ()>'
8 | std::function<int()> fn = std::bind_front(f, 0);
| ^ ~~~~~~~~~~~~~~~~~~~~~
/opt/compiler-explorer/gcc-14.2.0/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../include/c++/14.2.0/bits/std_function.h:375:7: note: candidate constructor not viable: no known conversion from '_Bind_front_t<int (&)(int), int>' (aka '_Bind_front<int (*)(int), int>') to 'nullptr_t' (aka 'std::nullptr_t') for 1st argument
375 | function(nullptr_t) noexcept
| ^ ~~~~~~~~~
/opt/compiler-explorer/gcc-14.2.0/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../include/c++/14.2.0/bits/std_function.h:386:7: note: candidate constructor not viable: no known conversion from '_Bind_front_t<int (&)(int), int>' (aka '_Bind_front<int (*)(int), int>') to 'const function<int ()> &' for 1st argument
386 | function(const function& __x)
| ^ ~~~~~~~~~~~~~~~~~~~
/opt/compiler-explorer/gcc-14.2.0/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../include/c++/14.2.0/bits/std_function.h:404:7: note: candidate constructor not viable: no known conversion from '_Bind_front_t<int (&)(int), int>' (aka '_Bind_front<int (*)(int), int>') to 'function<int ()> &&' for 1st argument
404 | function(function&& __x) noexcept
| ^ ~~~~~~~~~~~~~~
/opt/compiler-explorer/gcc-14.2.0/lib/gcc/x86_64-linux-gnu/14.2.0/../../../../include/c++/14.2.0/bits/std_function.h:435:2: note: candidate template ignored: requirement '_Callable<std::_Bind_front<int (*)(int), int>, std::_Bind_front<int (*)(int), int>, std::__invoke_result<std::_Bind_front<int (*)(int), int> &>>::value' was not satisfied [with _Functor = _Bind_front_t<int (&)(int), int>]
435 | function(_Functor&& __f)
| ^
1 error generated.
```
Clang 19 does not produce this error. Clang 20 with GCC 15 also does not produce this error, so it is specific to Clang 20 + GCC 14.
https://godbolt.org/z/1Msv6fo9M
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