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852天前// 使用一个函数对象来保存状态 |
#include <algorithm> |
#include <iostream> |
#include <vector> |
#include <list> |
using namespace std; |
template<typename elementType> |
struct DisplayElementKeepCount { |
// Hold the count in a member variable |
int m_nCount; |
// Constructor |
DisplayElementKeepCount() { |
m_nCount = 0; |
} |
// Display the element, hold count! |
void operator ()(const elementType& element) { |
++m_nCount; |
cout << element << ' '; |
} |
}; |
int main() { |
vector<int> vecIntegers; |
for (int nCount = 0; nCount < 10; ++nCount) |
vecIntegers.push_back(nCount); |
cout << "Displaying the vector of integers: " << endl; |
// Display the array of integers |
DisplayElementKeepCount<int> mResult; |
mResult = for_each(vecIntegers.begin() // Start of range |
, vecIntegers.end() // End of range |
, DisplayElementKeepCount<int>()); // function object |
cout << endl << endl; |
// Use the state stores in the return value of for_each! |
cout << "'" << mResult.m_nCount << "' elements were displayed!" << endl; |
return 0; |
} |
