xchg.hpp File Reference

A constexpr exchange function. More...

#include "ugmisc/features.hpp"
#include <utility>

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Functions
template<class T, class U = T>
constexpr T	ugmisc::xchg (T &object, U &&new_value)

Detailed Description

A constexpr exchange function.

In C++17 this provides an alternative to std::exchange which is constexpr. In C++20 this just forwards its arguments to std::exchange, which is constexpr anyway.

Function Documentation

xchg()

template<class T, class U = T>

T ugmisc::xchg ( T & object, U && new_value )

constexpr

This is probably worse than std::exchange if you don't need it to be constexpr, but in the case that std::exchange is constexpr anyway, it just forwards the call to it.

Returns

The original value of object.