https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126427
Bug ID: 126427
Summary: Pair comparisons assume same types
Product: gcc
Version: 15.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: asdfsddf1 at outlook dot com
Target Milestone: ---
Created attachment 65138
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65138&action=edit
The compiler fails with no match for operator== of pair<long long, int> and
pair<int, long long>
According to https://en.cppreference.com/cpp/utility/pair/operator_cmp,
std::pair has comparison for different types in a pair, so logically this code
should compile:
```
#include <utility>
#include <iostream>
int main() {
std::pair<long long, int> a{1LL, 2};
std::pair<int, long long> b{1, 2LL};
std::cout << (a == b); // OK, prints 1
}
```
For reference, MSVC and clang (with libc++) compiles fine with C++14, while g++
using the libstdc++ version tested does not provide the C++14 heterogeneous
std::pair comparison overloads, while other standard library implementations
do. (https://godbolt.org/z/T9efnn9zW)
I have attached the preprocessed source file just in case.
