Created
November 20, 2018 03:57
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map and zip function in c++
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// Example program | |
#include <iostream> | |
#include <string> | |
#include <vector> | |
using std::vector; | |
template<typename P, typename Iterator, typename Mapper> | |
void map(Iterator current, Iterator end, Mapper mapper, vector<P>& ret) { | |
if (current == end) return; | |
ret.push_back(mapper(*current)); | |
map(++current, end, mapper, ret); | |
}; | |
template<typename IteratorA, typename IteratorB, typename Zipper, typename P> | |
void zip(IteratorA a, IteratorA aEnd, IteratorB b, IteratorB bEnd, Zipper zipper, vector<P>& ret) { | |
if (a == aEnd || b == bEnd) return; | |
ret.push_back(zipper(*a, *b)); | |
zip(++a, aEnd, ++b, bEnd, zipper, ret); | |
} | |
int main() | |
{ | |
vector<int> a{1,2,3,4,5}; | |
vector<int> ret; | |
map(a.begin(), a.end(), [](int i){return i*i;}, ret); | |
vector<float> ret2; | |
zip(a.begin(), a.end(), ret.begin(), ret.end(), [](int a, int b){ return (float)a + (float)b;}, ret2); | |
for (auto& i : ret2) { | |
std::cout << i << ","; | |
} | |
} |
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