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

C++ Functional Constructor

It constructs a std::function from a variety of sources.

Following is the declaration for std::function.

The following are creating an empty function.

function();
function( std::nullptr_t );

noexcept:noexcept specification.

The following functions are Copying or moving the target of other to the target of *this. If other is empty, *this will be empty after the call too.

function( const function& other );
function( function&& other );

noexcept:noexcept specification.

The following functions is initializing the target with a copy of f. If f is a null pointer to function or null pointer to member, *this will be empty after the call. This constructor does not participate in overload resolution unless f is Callable for argument types Args and return type R

template< class F > 
function( F f );

noexcept:noexcept specification.

The following functions are same as just that alloc is used to allocate memory for any internal data structures that the function might use.

template< class Alloc > 
function( std::allocator_arg_t, const Alloc& alloc );

template< class Alloc > 
function( std::allocator_arg_t, const Alloc& alloc, 
          std::nullptr_t );

template< class Alloc >
function( std::allocator_arg_t, const Alloc& alloc, 
          const function& other );
		  
template< class Alloc > 
function( std::allocator_arg_t, const Alloc& alloc, 
          function&& other );
		  
template< class F, class Alloc > 
function( std::allocator_arg_t, const Alloc& alloc, F f );

noexcept:noexcept specification.

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

• f − a callable used to initialize *this.

• alloc − It is used for internal memory allocation.

functional.htm

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