[pair.piecewise]

# 22 General utilities library [[utilities]](./#utilities)

## 22.3 Pairs [[pairs]](pairs#pair.piecewise)

### 22.3.5 Piecewise construction [pair.piecewise]

[🔗](#lib:piecewise_construct_t)

`struct piecewise_construct_t {
  explicit piecewise_construct_t() = default;
};
inline constexpr piecewise_construct_t piecewise_construct{};
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L1497)

The struct piecewise_construct_t is an empty class type
used as a unique type to disambiguate constructor and function overloading[.](#1.sentence-1)

Specifically,pair has a constructor with piecewise_construct_t as the
first argument, immediately followed by two <tuple> arguments used
for piecewise construction of the elements of the pair object[.](#1.sentence-2)