---
name: "std::mergeable"
section: "3cxx"
platform: "linux"
package: "libstdc++-12-doc"
version: "12.4.0-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/std::mergeable/3cxx"
---

# std::mergeable(3cxx)

\[alg.req.mergeable\], concept mergeable

## NAME

std::mergeable - \[alg.req.mergeable\], concept `mergeable`

## SYNOPSIS

`#include <iterator>`

## Concept definition

```
template<typename _I1, typename _I2, typename _Out, typename _Rel ranges::less, typename _P1 identity, typename _P2 identity>
concept std::mergeable =  input_iterator<_I1> && input_iterator<_I2>
      && weakly_incrementable<_Out> && indirectly_copyable<_I1, _Out>
      && indirectly_copyable<_I2, _Out>
      && indirect_strict_weak_order<_Rel, projected<_I1, _P1>,
                                    projected<_I2, _P2>>
```

## Detailed Description

\[alg.req.mergeable\], concept `mergeable`

## Author

Generated automatically by Doxygen for libstdc++ from the source code.