Apply a callback to an array
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Apply a callback function to each element of an Array
Ruby
#create the array ary = [1,2,3,4,5] #create the function (print the square) def print_square(i) puts i**2 end #ruby ary.each do |i| print_square(i) end # prints 1,4,9,16,25
C++
Compiler: GNU Compiler Collection gcc/g++ version 4.1.1
Using c-style array
#include <iostream> //cout for printing #include <algorithm> //for_each defined here //create the function (print the square) void print_square(int i) { std::cout << i*i << " "; } int main() { //create the array int ary[]={1,2,3,4,5}; //stl for_each std::for_each(ary,ary+5,print_square); return 0; } //prints 1 4 9 16 25
Using std::vector
#include <iostream> //cout for printing #include <algorithm> //for_each defined here #include <vector> //stl vector class //create the function (print the square) void print_square(int i) { std::cout << i*i << " "; } int main() { //create the array std::vector<int> ary; ary.push_back(1); ary.push_back(2); ary.push_back(3); ary.push_back(4); ary.push_back(5); //stl for_each std::for_each(ary.begin(),ary.end(),print_square); return 0; } //prints 1 4 9 16 25
More tricky with binary function
#include <iostream> //cout for printing #include <algorithm> //for_each defined here #include <vector> //stl vector class #include <functional> //bind and ptr_fun //create a binary function (print any two arguments together) template<class type1,class type2> void print_juxtaposed(type1 x, type2 y) { std::cout << x << y; } int main() { //create the array std::vector<int> ary; ary.push_back(1); ary.push_back(2); ary.push_back(3); ary.push_back(4); ary.push_back(5); //stl for_each, using binder and adaptable unary function std::for_each(ary.begin(),ary.end(),std::bind2nd(std::ptr_fun(print_juxtaposed<int,std::string>),"x ")); return 0; } //prints 1x 2x 3x 4x 5x