sortby.cpp

本程序给出了SSD5实验课中Exercise6的参考程序 内附有详细的注释 下载后请仔细参照源代码进行分析 切莫完全搬照

#include "SortBy.h"

using namespace std;

SortBy::SortBy(string keyField) : keyField(keyField) {}  

bool SortBy::operator()(Advertisement *a1, Advertisement *a2) {
    
    if (keyField == "email") {
      return (a1->getEmail() < a2->getEmail());
    }
    
    if (keyField == "start") {
      return (a1->getStart() < a2->getStart());
    }
    
    if (keyField == "close") {
      return (a1->getClose() < a2->getClose());
    }

    if (keyField == "quantity") {
      return (a1->getQuantity() < a2->getQuantity());
    }

    return false;
}