---
name: "std::relation"
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::relation"
---

# std::relation(3)

\[concept.relation\], concept relation

## NAME

std::relation - \[concept.relation\], concept relation

## SYNOPSIS

\#include \<concepts\>

## Concept definition

```
    template<typename _Rel, typename _Tp, typename _Up>
    concept relation = predicate<_Rel, _Tp, _Tp> && predicate<_Rel, _Up, _Up>
      && predicate<_Rel, _Tp, _Up> && predicate<_Rel, _Up, _Tp>
```

## Detailed Description

\[concept.relation\], concept relation

## Author

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