_value.h File Reference

#include <algorithm>
#include <typeinfo>
#include <cassert>

Go to the source code of this file.

Classes
class	value_store_type< T >
class	value
	Abstraction of the concept of a generic value. More...
struct	value::contentholder
class	value::holder< T >
class	bad_value_cast
Functions
template<typename ValueType>
ValueType *	value_cast (value *v)
template<typename ValueType>
const ValueType *	value_cast (const value *v)
template<typename ValueType>
ValueType	value_cast (const value &v)

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Function Documentation

template<typename ValueType> ValueType* value_cast (  value *  v  )

Returns a pointer to the desired value type if the value_type and the internal binary format agree (mediated by using the value_store_type class), otherwise it returns 0. See also: value_store_type Definition at line 199 of file _value.h. References value::content, and value::type().

template<typename ValueType> const ValueType* value_cast (  const value *  v  )

Same as above except tweaked to allow const cast (possibly for purposes involving type agreement... if const impacts a typeid call I do not know...) Definition at line 212 of file _value.h.

template<typename ValueType> ValueType value_cast (  const value &  v  )

Extract a copy of the internal object and will throw a bad_value_cast exception if the types do not agree. Note: I'm not sure why boost::any didn't use a reference here... there must be a reason... See also: bad_value_cast Definition at line 225 of file _value.h.

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