std::tuple<Types...>::operator=

 

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Technical Specifications

 

Utilities library

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rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=
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std::tuple

Member functions

tuple::tuple

tuple::operator=

tuple::swap

Non-member functions

make_tuple

tie

forward_as_tuple

tuple_cat

operator==operator!=operator<operator<=operator>operator>=

std::swap

get

Deduction guides(C++17)

Helper classes

tuple_size

tuple_element

uses_allocator

ignore

 

	(1)
tuple& operator=( const tuple& other );			(since C++11) (until C++20)
constexpr tuple& operator=( const tuple& other );			(since C++20)
		(2)
tuple& operator=( tuple&& other ) noexcept(/* see below */);				(since C++11) (until C++20)
constexpr tuple& operator=( tuple&& other ) noexcept(/* see below */);				(since C++20)
			(3)
template< class... UTypes > tuple& operator=( const tuple<UTypes...>& other );					(since C++11) (until C++20)
template< class... UTypes > constexpr tuple& operator=( const tuple<UTypes...>& other );					(since C++20)
				(4)
template< class... UTypes > tuple& operator=( tuple<UTypes...>&& other );						(since C++11) (until C++20)
template< class... UTypes > constexpr tuple& operator=( tuple<UTypes...>&& other );						(since C++20)
					(5)
template< class U1, class U2 > tuple& operator=( const pair<U1,U2>& p );							(since C++11) (until C++20)
template< class U1, class U2 > constexpr tuple& operator=( const pair<U1,U2>& p );							(since C++20)
						(6)
template< class U1, class U2 > tuple& operator=( pair<U1,U2>&& p );								(since C++11) (until C++20)
template< class U1, class U2 > constexpr tuple& operator=( pair<U1,U2>&& p );								(since C++20)

Replaces the contents of the tuple with the contents of another tuple or a pair.

1) Copy assignment operator. Assigns each element of other to the corresponding element of *this.

2) Move assignment operator. For all i, assigns std::forward<Ti>(get<i>(other)) to get<i>(*this).

3) For all i, assigns std::get<i>(other) to std::get<i>(*this).

4) For all i, assigns std::forward<Ui>(std::get<i>(other)) to std::get<i>(*this).

5) Assigns p.first to the first element of *this and p.second to the second element of *this.

6) Assigns std::forward<U1>(p.first) to the first element of *this and std::forward<U2>(p.second) to the second element of *this.

The behavior of these functions is undefined unless: For (1), std::is_copy_assignable<T_i>::value is true for all T_i in Types. For (2), std::is_move_assignable<T_i>::value is true for all T_i in Types. For (3), sizeof...(UTypes) == sizeof...(Types) and std::is_assignable<T_i&, const U_i&>::value is true for all corresponding pairs of types T_i in Types and U_i in UTypes. For (4), sizeof...(UTypes) == sizeof...(Types) and std::is_assignable<T_i&, U_i&&>::value is true for all corresponding pairs of types T_i in Types and U_i in UTypes. For (5), sizeof...(Types) == 2 and std::is_assignable<T_0&, const U1&>::value and std::is_assignable<T_1&, const U2&>::value are both true, where T_0 and T_1 are the two types constituting Types. For (6), sizeof...(Types) == 2 and std::is_assignable<T_0&, U1&&>::value and std::is_assignable<T_1&, U2&&>::value are both true, where T_0 and T_1 are the two types constituting Types.

(until C++17)

These functions do not participate in overload resolution (or, for the copy assignment operator, is defined as deleted) if any required assignment operation is invalid or if there is a size mismatch. Specifically: (1) is defined as deleted unless std::is_copy_assignable<T_i>::value is true for all T_i in Types. (2) does not participate in overload resolution unless std::is_move_assignable<T_i>::value is true for all T_i in Types. (3) does not participate in overload resolution unless sizeof...(UTypes) == sizeof...(Types) and std::is_assignable<T_i&, const U_i&>::value is true for all corresponding pairs of types T_i in Types and U_i in UTypes. (4) does not participate in overload resolution unless sizeof...(UTypes) == sizeof...(Types) and std::is_assignable<T_i&, U_i&&>::value is true for all corresponding pairs of types T_i in Types and U_i in UTypes. (5) does not participate in overload resolution unless sizeof...(Types) == 2, std::is_assignable<T_0&, const U1&>::value and std::is_assignable<T_1&, const U2&>::value are both true, where T_0 and T_1 are the two types constituting Types. (6) does not participate in overload resolution unless std::is_assignable<T_0&, U1&&>::value and std::is_assignable<T_1&, U2&&>::value are both true, where T_0 and T_1 are the two types constituting Types.

(since C++17)

Parameters

other	-	tuple to replace the contents of this tuple
p	-	pair to replace the contents of this 2-tuple

Return value

*this

Exceptions

1) (none)

2)

noexcept specification:  

noexcept(

    is_nothrow_move_assignable<T0>::value &&
    is_nothrow_move_assignable<T1>::value &&
    is_nothrow_move_assignable<T2>::value &&
    ...

)

3-6) (none)