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853天前// std::transform 一元、二元函数 |
#include <algorithm> |
#include <string> |
#include <vector> |
#include <deque> |
#include <iostream> |
#include <functional> |
int main() { |
using namespace std; |
string strSample("THIS is a TEst string!"); |
cout << "The sample string is: " << strSample << endl; |
string strLowerCaseCopy; |
strLowerCaseCopy.resize(strSample.size()); |
transform(strSample.begin() // start of source range |
, strSample.end() // end of source range |
, strLowerCaseCopy.begin() // start of destination range |
, tolower); // unary function |
cout << "Result of 'transform' on the string with 'tolower':" << endl; |
cout << "\"" << strLowerCaseCopy << "\"" << endl << endl; |
// Two sample vectors of integers... |
vector<int> vecIntegers1, vecIntegers2; |
for (int nNum = 0; nNum < 10; ++nNum) { |
vecIntegers1.push_back(nNum); |
vecIntegers2.push_back(10 - nNum); |
} |
// A destination range for holding the result of addition |
deque<int> dqResultAddition(vecIntegers1.size()); |
transform(vecIntegers1.begin() // start of source range 1 |
, vecIntegers1.end() // end of source range 1 |
, vecIntegers2.begin() // start of source range 2 |
, dqResultAddition.begin() // start of destination range |
, plus<int>()); // binary function |
cout << "Result of 'transform' using binary function 'plus': " << endl; |
cout << endl << "Index Vector1 + Vector2 = Result (in Deque)" << endl; |
for (size_t nIndex = 0; nIndex < vecIntegers1.size(); ++nIndex) { |
cout << nIndex << " \t " << vecIntegers1[nIndex] << "\t+ "; |
cout << vecIntegers2[nIndex] << " \t = "; |
cout << dqResultAddition[nIndex] << endl; |
} |
return 0; |
} |
