[Copy string] copy string #C++ #string

copy-string.cpp

// with stl
int a[] = { 1, 2, 3, 4, 5 };
int b[5];
std::copy(std::begin(a),std::end(a),std::begin(b));
for(auto e:b) cout << e << " ";         // 1 2 3 4 5

// array container (C++11)
std::array<int,5> arr = { 1, 2, 3, 4, 5 };
std::array<int,5> copy;
copy = arr;      
arr[0] = 100;
for(auto e:copy) cout << e << " ";      // 1 2 3 4 5

// C style - memcpy
int arr[] = {1,2,3,4,5};
int copy[5];
int len = sizeof(arr) / sizeof(arr[0]);
// void* memcpy(void* destination,const void* source,size_t num);
memcpy(copy, arr, len * sizeof(int));   
for(auto e:copy) cout<< e << " ";       // 1 2 3 4 5

// C style - memmove
int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
memmove(arr + 3, arr + 1, sizeof(int) * 5);
for(auto e:arr) cout<< e << " ";        // 1 2 3 2 3 4 5 6