sumvalue.h

C++编程思想第二版第一册答案

//: C25:sumValue.h
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Sums the value of Trash in any type of STL
// container of any specific type of Trash:
#ifndef SUMVALUE_H
#define SUMVALUE_H
#include <typeinfo>
#include <vector>

template<typename Cont>
void sumValue(Cont& bin) {
  double val = 0.0f;
  typename Cont::iterator tally = bin.begin();
  while(tally != bin.end()) {
    val +=(*tally)->weight() * (*tally)->value();
    out << "weight of "
        << typeid(*(*tally)).name()
        << " = " << (*tally)->weight() 
        << endl;
    tally++;
  }
  out << "Total value = " << val << endl;
}
#endif // SUMVALUE_H ///:~