std::copyable_function::operator= - cppreference.com
From cppreference.com
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(1) | (since C++26) |
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(2) | (since C++26) |
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(3) | (since C++26) |
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(4) | (since C++26) |
Assigns a new target to std::copyable_function or destroys its target.
1) Assigns a copy of the target of other to *this as if by executing auto(other).swap(*this).
2) Moves the target of other to *this or destroys the target of *this (if any) if other is empty, by auto(std::move(other)).swap(*this). other is in a valid state with an unspecified value after move assignment.
3) Destroys the current target if it exists. *this is empty after the call.
4) Sets the target of *this to the callable f, or destroys the current target if f is a null function pointer, a null pointer to member function, or an empty std::copyable_function, as if by executing copyable_function(std::forward<F>(f)).swap(*this);. This overload participates in overload resolution only if the constructor of copyable_function from F participates in overload resolution. The program is ill-formed or has undefined behavior if the selected constructor call is ill-formed or has undefined behavior.
Parameters
| other | - | another std::copyable_function object to copy or move the target of
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| f | - | a callable object to initialize the new target with |
Return value
*this
Example
See also
| assigns a new target (public member function of std::function<R(Args...)>) [edit]
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| replaces or destroys the target (public member function of std::move_only_function) [edit]
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