partitioning - Error with C++ array partition compilation -

i have problem when trying compile code:

#include <iostream> #include <functional> using namespace std;  template <typename t> size_t partition(t arr[], size_t size, function<bool(t)> lambda) {               int index = 0;               for(int = 0; < size; i++) {                       if(fun(arr[i]) == true) {                                      //jeśli element spełnia predykat zamien go z     arr[index] ustaw index na 'i'                             int tmp = arr[index];                             arr[index] = arr[i];                             arr[i] = tmp;                             index = i;                       }                           else { //na początku gdy index = 0, powiększ                            if(index == 0)                                  index = i;                       }                   }     return index;           }  template <typename t> void printtable(t arr[], size_t size) {  cout << "[ ";  for(int = 0; < size; i++) {          cout << arr[i] << " ";  }  cout << "] "; }  template <typename t> bool less10(t a) { return < 10; }  int main() { int arri[] = {1,20,3,50,6,7}; size_t sizi = sizeof(arri)/sizeof(arri[0]); printtable(arri, sizi); size_t fi = partition(arri,sizi, (function<bool(int)>)less10<int>); printtable(arri,sizi); cout << "index: " << fi << endl; cout << endl; double arrd[] = {1,20,3,50,6,7}; size_t sizd = sizeof(arrd)/sizeof(arrd[0]); printtable(arrd, sizd); function<bool(double)> lambda =  [] (double x) -> bool {return x > 10;}; size_t fd = partition(arrd,sizd,lambda); printtable(arrd,sizd); cout << "index: " << fd << endl; } 

here have error output:

6 c:\documents , settings\grzegorz\pulpit\funkcje.cpp `function' has not been declared  6 c:\documents , settings\grzegorz\pulpit\funkcje.cpp expected `,' or `...' before '<' token  6 c:\documents , settings\grzegorz\pulpit\funkcje.cpp iso c++ forbids declaration of `parameter' no type   c:\documents , settings\grzegorz\pulpit\funkcje.cpp in function `int main()':  43 c:\documents , settings\grzegorz\pulpit\funkcje.cpp `function' undeclared (first use function)    (each undeclared identifier reported once each function appears in.)  43 c:\documents , settings\grzegorz\pulpit\funkcje.cpp expected primary-expression before "bool"  43 c:\documents , settings\grzegorz\pulpit\funkcje.cpp expected `)' before "bool"  50 c:\documents , settings\grzegorz\pulpit\funkcje.cpp expected primary-expression before "bool"  50 c:\documents , settings\grzegorz\pulpit\funkcje.cpp expected `;' before "bool"  51 c:\documents , settings\grzegorz\pulpit\funkcje.cpp `lambda' undeclared (first use function)