e02-05.cpp

游戏开发数据结构Data Structures for Game Programmers

// =======================================================
//  Chapter 2, Example 5
//  Using values of template parameters.
// =======================================================
#include <iostream.h>


// -------------------------------------------------------
// Name:        Array
// Description: A simple static array class
// -------------------------------------------------------
template< class Datatype, int size, Datatype zero >
class Array
{
public:

    // set function, sets an index
    void Set( Datatype p_item, int p_index )
    {
        m_array[p_index] = p_item;
    }

    // get function, gets an index
    Datatype Get( int p_index )
    {
        return m_array[p_index];
    }


    void Clear( int p_index )
    {
        m_array[p_index] = zero;
    }

    
private:

    // the array.
    Datatype m_array[size];
};


void main()
{
    Array< int, 5, 0 > array1;
    Array< int, 10, 42 > array2;
    Array< float, 5, 0.5f > array3;

    array1.Clear( 0 );
    array2.Clear( 0 );
    array3.Clear( 0 );

    cout << "array1.Get( 0 ) = " << array1.Get( 0 ) << endl;
    cout << "array2.Get( 0 ) = " << array2.Get( 0 ) << endl;
    cout << "array3.Get( 0 ) = " << array3.Get( 0 ) << endl;
}