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# std::function::function

From cppreference.com
< cpp‎ | utility‎ | functional‎ | function

function(); | (1) | (since C++11)
function( std::nullptr_t ); | (2) | (since C++11)
function( const function& other ); | (3) | (since C++11)
function( function&& other ); | (4) | (since C++11)
template< class F > function( F f ); | (5) | (since C++11)
template< class Alloc > function( std::allocator_arg_t, const Alloc& alloc ); | (6) | (since C++11)
template< class Alloc > function( std::allocator_arg_t, const Alloc& alloc, std::nullptr_t ); | (7) | (since C++11)
template< class Alloc > function( std::allocator_arg_t, const Alloc& alloc, const function& other ); | (8) | (since C++11)
template< class Alloc > function( std::allocator_arg_t, const Alloc& alloc, function&& other ); | (9) | (since C++11)
template< class F, class Alloc > function( std::allocator_arg_t, const Alloc& alloc, F f ); | (10) | (since C++11)

Constructs a `std::function` from a variety of sources.

1-2) Creates an empty function.
3-4) Copies (3) or moves (4) the target of `other` to the target of *this. If `other` is empty, *this will be empty after the call too.
5) Initializes 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.
6-10) Same as (1-5) just that `alloc` is used to allocate memory for any internal data structures that the `function` might use.

### [edit] Parameters

other | - | the function object used to initialize *this
f | - | a callable used to initialize *this
alloc | - | an `Allocator` used for internal memory allocation
Type requirements
- `F` must meet the requirements of `Callable` and `CopyConstructible`.
- `Alloc` must meet the requirements of `Allocator`.

### [edit] Exceptions

1-2)
`noexcept` specification:
noexcept
3-5) (none)
6-7)
`noexcept` specification:
noexcept
8-10) (none)

### [edit] Example

| This section is incomplete Reason: no example

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- Todo no example