October 01, 2000
An Improved Variant Type Based on Member Templates
October 2000/An Improved Variant Type Based on Member Templates/Listing 2
// This variant copies the original
// value into its own data to
// preserve the value when the
// original variable goes out of scope.
struct variant1_t
{
variant1_t():data(NULL){}
~variant1_t(){ free(data); }
template<typename T> variant1_t ( T v )
:data(malloc(sizeof(T)))
{ memcpy ( data , &v , sizeof(T)); }
template<typename T> operator T () const
{ return * reinterpret_cast<T*>(data); }
void* data ;
} ;
// usage:
variant1_t _int ( 2 ) ;
variant1_t _dbl ( 3.14 ) ;
cout << (int) _int << endl ;
cout << (double)_dbl << endl ;
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