std::tuple::operator=

 

C++

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Technical Specifications

 

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rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=

optional, any and variant (C++17)

optional

any

variant

in_placein_place_typein_place_indexin_place_tin_place_type_tin_place_index_t

Pairs and tuples

pair

tuple (C++11)

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std::tuple

Member functions

tuple::tuple

tuple::operator=

tuple::swap

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make_tuple

tie

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tuple_cat

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

std::swap

get

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tuple_size

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uses_allocator

ignore

 

tuple& operator=( const tuple& other );	(1)	(since C++11)
tuple& operator=( tuple&& other );	(2)	(since C++11)
template< class... UTypes > tuple& operator=( const tuple<UTypes...>& other );	(3)	(since C++11)
template< class... UTypes > tuple& operator=( tuple<UTypes...>&& other );	(4)	(since C++11)
template< class U1, class U2 > tuple& operator=( const pair<U1,U2>& p );	(5)	(since C++11)
template< class U1, class U2 > tuple& operator=( pair<U1,U2>&& p );	(6)	(since C++11)

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

1) Copy assignment operator. Replaces each element with a copy of the corresponding element of other.

2) Move assignment operator. Replaces each element with the corresponding element of other using move semantics.

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)