C++11 std::transform函数使用小结

std::transform(InputIt first1, InputIt last1, OutputIt d_first, UnaryOperation unary_op);

std::transform(InputIt1 first1, InputIt1 last1, InputIt2 first2, OutputIt d_first, BinaryOperation binary_op);

#include <algorithm>  
#include <vector>  
#include <iostream>  
#include <iterator>
int main() {  
    // int数组处理，每个项乘以10
    std::vector<int> inputs = {1, 2, 3, 4};
    std::vector<int> outputs(inputs.size());
    // 使用transform处理
    std::transform(inputs.begin(), inputs.end(), outputs.begin(), [](int x){return x*10;});
    // 输出
    std::copy(outputs.begin(), outputs.end(), std::ostream_iterator<int>(std::cout, " "));
    std::cout << std::endl;
    std::string str =  "hello world!";
    // 将string转大写
    std::transform(str.begin(), str.end(), str.begin(), [](unsigned char c){return std::toupper(c);});
    // 输出
    std::copy(str.begin(), str.end(), std::ostream_iterator<unsigned char>(std::cout, " "));
    std::cout << std::endl;
    std::vector<std::string> sinputs = {"abc", "jhk", "hello", "workd"};
    std::vector<std::string> soutpus(sinputs.size());
    // 将string数组转大写
    std::transform(sinputs.begin(), sinputs.end(), soutpus.begin(), [](std::string s){ for(auto &el : s)el = std::toupper(el); return s;});
    // 输出
    std::copy(soutpus.begin(), soutpus.end(), std::ostream_iterator<std::string>(std::cout, ","));
    std::cout << std::endl;
    return 0;  
}