Collection of C++ snippets
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11 years ago
#include <vector>
#include <map>
#include <iostream>
#include "counting_iterator.hpp"
#include "tuple_element.hpp"
void counting_iterator(){
std::vector<int> v{1,3,37,1337,7};
for(auto x : counted(v)){
std::cout << "v[" << x.index << "] = " << x.value << std::endl;
}
for(auto x : counted(v)){
x.value *= x.index;
}
for(auto x : counted(v)){
std::cout << "v[" << x.index << "] = " << x.value << std::endl;
}
}
void tuple_element (){
std::map<int, int> m1;
for(int i = -5; i <= 5; ++i)
m1[i] = i*i;
for(auto & p : values(m1)){
p -= 5;
}
auto const & m = m1;
for(auto & p : values(m)){ // p is a const ref
std::cout << p << "\t";
}
std::cout << std::endl;
for(auto & p : keys(m1)){ // p is a const ref, because keys in a map are const
std::cout << p << "\t";
}
std::cout << std::endl;
}
int main(){
counting_iterator();
tuple_element();
}