std::tuple<Types...>::operator=
| (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();
| (since C++11)
(until C++20) |
constexpr tuple& operator=( tuple&& other ) noexcept();
| (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).
Example
See also