C++ - "replace" 和 "replace_copy" 区别

"replace" 和 "replace_copy" 区别

 
两个函数"replace"和"replace_copy"都是标准库算法中的函数.
replace是替代某一个元素, replace_copy是复制并且替代某一个元素.
 
示例(VS2012):#include <iostream> // std::cout
#include <algorithm> // std::replace
#include <vector> // std::vector

int main () {
int myints[] = { 10, 20, 30, 30, 20, 10, 10, 20 };

/*replace*/
std::vector<int> myvector1 (myints, myints+8); // 10 20 30 30 20 10 10 20
std::replace (myvector1.begin(), myvector1.end(), 20, 99); // 10 99 30 30 99 10 10 99
std::cout << "replace() myvector1:";
for(const auto i : myvector1)
std::cout << i << " ";
std::cout << std::endl;

/*replace_copy*/
std::vector<int> myvector2 (8);
std::replace_copy (myints, myints+8, myvector2.begin(), 20, 78);
std::cout << "replace_copy() myvector2:";
for(const auto i : myvector2)
std::cout << i << " ";
std::cout << std::endl;

return 0;
}