Class template any<Concept, T &>

boost::type_erasure::any<Concept, T &>

Synopsis

// In header: <boost/type_erasure/any.hpp>

template<typename Concept, typename T> 
class any<Concept, T &> {
public:
  // construct/copy/destruct
  template<typename U> any(U &);
  template<typename U, typename Map> any(U &, const static_binding< Map > &);
  any(const any &);
  any(any< Concept, T > &);
  template<typename Concept2, typename Tag2> 
    any(const any< Concept2, Tag2 & > &);
  template<typename Concept2, typename Tag2> any(any< Concept2, Tag2 > &);
  template<typename Concept2, typename Tag2, typename Map> 
    any(const any< Concept2, Tag2 & > &, const static_binding< Map > &);
  template<typename Concept2, typename Tag2, typename Map> 
    any(any< Concept2, Tag2 > &, const static_binding< Map > &);
  template<typename Concept2, typename Tag2> 
    any(const any< Concept2, Tag2 & > &, const binding< Concept > &);
  template<typename Concept2, typename Tag2> 
    any(any< Concept2, Tag2 > &, const binding< Concept > &);
  template<typename U> any & operator=(U &&);
};

Description

`any` public construct/copy/destruct

template<typename U> any(U & arg);

Constructs an any from a reference.

Parameters:

arg

The object to bind the reference to.

Requires:

U is a model of Concept.

Requires:

Concept must not refer to any non-deduced placeholder besides T.

Throws:

Nothing.

template<typename U, typename Map> 
  any(U & arg, const static_binding< Map > & binding);

Constructs an any from a reference.

Parameters:

`arg`	The object to bind the reference to.
`binding`	Specifies the actual types that all the placeholders should bind to.

Requires:

U is a model of Concept.

Requires:

Map is an MPL map with an entry for every non-deduced placeholder referred to by Concept.

Throws:

Nothing.

```
any(const any & other);
```
Constructs an any from another reference.

Parameters:

other

The reference to copy.

Throws:
Nothing.
```
any(any< Concept, T > & other);
```
Constructs an any from another any.

Parameters:

other

The object to bind the reference to.

Throws:
Nothing.

template<typename Concept2, typename Tag2> 
  any(const any< Concept2, Tag2 & > & other);

Constructs an any from another reference.

Parameters:

other

The reference to copy.

Requires:

Concept must not refer to any non-deduced placeholder besides T.

Requires:

After substituting T for Tag2, the requirements of Concept2 must be a superset of the requirements of Concept.

Throws:

std::bad_alloc

template<typename Concept2, typename Tag2> any(any< Concept2, Tag2 > & other);

Constructs an any from another any.

Parameters:

other

The object to bind the reference to.

Requires:

Concept must not refer to any non-deduced placeholder besides T.

Requires:

After substituting T for Tag2, the requirements of Concept2 must be a superset of the requirements of Concept.

Throws:

std::bad_alloc

template<typename Concept2, typename Tag2, typename Map> 
  any(const any< Concept2, Tag2 & > & other, 
      const static_binding< Map > & binding);

Constructs an any from another reference.

Parameters:

`binding`	Specifies the mapping between the two concepts.
`other`	The reference to copy.

Requires:

Map must be an MPL map with keys for all the non-deduced placeholders used by Concept and values for the corresponding placeholders in Concept2.

Requires:

After substituting placeholders according to Map, the requirements of Concept2 must be a superset of the requirements of Concept.

Throws:

std::bad_alloc

template<typename Concept2, typename Tag2, typename Map> 
  any(any< Concept2, Tag2 > & other, const static_binding< Map > & binding);

Constructs an any from another any.

Parameters:

`binding`	Specifies the mapping between the two concepts.
`other`	The object to bind the reference to.

Requires:

Map must be an MPL map with keys for all the non-deduced placeholders used by Concept and values for the corresponding placeholders in Concept2.

Requires:

After substituting placeholders according to Map, the requirements of Concept2 must be a superset of the requirements of Concept.

Throws:

std::bad_alloc

template<typename Concept2, typename Tag2> 
  any(const any< Concept2, Tag2 & > & other, 
      const binding< Concept > & binding);

Constructs an any from another reference.

Parameters:

`binding`	Specifies the bindings of placeholders to actual types.
`other`	The reference to copy.

Requires:

The type stored in other must match the type expected by binding.

Postconditions:

binding_of(*this) == binding

Throws:

Nothing.

template<typename Concept2, typename Tag2> 
  any(any< Concept2, Tag2 > & other, const binding< Concept > & binding);

Constructs an any from another any.

Parameters:

`binding`	Specifies the bindings of placeholders to actual types.
`other`	The object to bind the reference to.

Requires:

The type stored in other must match the type expected by binding.

Postconditions:

binding_of(*this) == binding

Throws:

Nothing.

template<typename U> any & operator=(U && other);

Assigns to an any.

If an appropriate overload of assignable is not available and relaxed is in Concept, falls back on constructing from other.

Throws:

Whatever the assignment operator of the contained type throws. When falling back on construction, can only throw std::bad_alloc if U is an any that uses a different Concept. In this case assignment provides the strong exception guarantee. When calling the assignment operator of the contained type, the exception guarantee is whatever the contained type provides.

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