Any

Class dp::any provides type-safe storage for an instance of any copy-constructible type. An instance of dp::any may be constructed with and reassigned a value as many times as needed. Default-constructed instances of any are considered empty, and do not contain anything. The value can be retrieved via templated free function dp::any_cast. If dp::any_cast is called on an empty any, or with a type on an any which does not contain that type, an exception will be thrown.

List of Features

reset	Destroys the contained object
swap	Swaps the held values of two objects
has_value	Checks if an any currently has a value
type	Retrieves a std::type_info corresponding to the held type
any_cast	Retrieves the held value

Sample Code

#include "cpp98/any.h"

int main(){
 dp::any an(10); //Any now contains an int
 an = 50.5;      //Any now contains a double
 an = UnicodeString("Hello world"); //Any now contains a UnicodeString

 try{
    int x = dp::any_cast<int>(an); //Any does not currently contain an int, exception thrown
 }
 catch(dp::bad_any_cast& e){
    Print(e.what());  //NB: See borland compatibility on exceptions if on Borland
 }
 
 Print(dp::any_cast<UnicodeString>(an)); //Prints "Hello world"
}