---
name: "std::mergeable"
section: "3"
platform: "linux"
package: "gcc"
version: "16.2.1+r23+gd564253eb6c8-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/std::mergeable"
---

# std::mergeable(3)

\[alg.req.mergeable\], 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 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.