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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_functional_operator.htm below:

C++ Functional Operators

It is used to assign the new target.

Following is the declaration for function::operator=

The following function is assigning a copy of target of other, as if by executing function(other).

function& operator=( const function& other );

none

The following function is moving the target of other to *this. other is in a valid state with an unspecified value.

function& operator=( function&& other );

none

The following function is droping the current target. *this is empty after the call.

function& operator=( std::nullptr_t );

noexcept:noexcept specification.

The following functions are seting the target of *this to the callable f.

template< class F >
function& operator=( F&& f );

template< class F > 
function& operator=( std::reference_wrapper f )

noexcept:noexcept specification.

• other − This function object used to initialize *this.

• f − a callable used to initialize *this.

functional.htm

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