constoverload.cpp

来自「压缩包里有教材<<C++模式设计-基于QT4开源跨平台开发框架&gt」· C++ 代码 · 共 41 行

#include "constoverload.h"
#include <iostream>
using namespace std ;

inline static double& zero(int index) { /** Returned when there is an index error */
    static double _zero = 0 ;
    _zero = 0 ;
    cerr << "index out of bounds: "  << index<< endl ; 
    return _zero;
}


ostream& operator<<(ostream& out, const Point3& v) {
    out << '(' << v[0] << ", " << v[1] << ", " << v[2] <<  ')';
    return out;
}

Point3::Point3(double x, double y, double z) {
    m_Coord[0] = x;
    m_Coord[1] = y;
    m_Coord[2] = z;
}

//start
const double& Point3::operator[](int index) const {
    if ((index >= 0) && (index < cm_Dim))
        return m_Coord[index];
    else
        return zero(index);
}

double& Point3::operator[](int index) {
    if ((index >= 0) && (index < cm_Dim))
        return m_Coord[index];
    else
        return zero(index);
 }
 
//end