| Issue |
90884
|
| Summary |
`<numeric>`: `std::reduce` is missing `static_assert` for _Mandates_
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
hewillk
|
```cpp
#include <vector>
#include <string>
#include <numeric>
#include <execution>
struct Op {
int operator()(int, std::string);
};
int main() {
std::vector<std::string> v;
return std::reduce(v.begin(), v.end(), 0, Op{});
}
```
https://godbolt.org/z/5T4cn95nv
According to the current wording, the above should be rejected as `std::reduce` has the following _Mandates_ ([[reduce]](https://eel.is/c++draft/reduce#5)):
> _Mandates_: All of
> (5.1) - `binary_op(init, *first)`,
> (5.2) - `binary_op(*first, init)`,
> (5.3) - `binary_op(init, init)`, and
> (5.4) - `binary_op(*first, *first)`
> are convertible to `T`.
>
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