<utility>

• Pairs: objects that can hold two values of different types: pair, make_pair, piecewise_construct, piecewise_construct_t.
• Generic relational operators: Standard definitions for the relational operators !=, >, <= and >= under a specific namespace: rel_ops.
• Rvalue casts (C++11): Allow the generation of rvalue references: forward, move, move_if_noexcept, declval.
• Generic swap function: definition used by default by the components of the standard library for all types that do not provide their own overload: swap.

函数

swap

交换两个对象的值 （函数模板）

make_pair

构造 pair 对象 (function template)

forward

转发参数 (函数模板)

move

作为右值移动 (函数模板)

move_if_noexcept

Move if noexcept (function template)

declval

Declaration value (function template)

类型

pair

Pair of values (class template)

piecewise_construct_t

Piecewise construct type (type)

常量

piecewise_construct

Piecewise construct constant (constant)

命名空间

rel_ops

Relational Operators (namespace)