#include <iostream>
#include <algorithm>
#include <functional>
 
template<typename T>
void tripleElements(T& container)
{
	typedef decltype(*std::begin(container)) value_type;
	typedef typename std::remove_reference<value_type>::type value_type_decayed;
 
	std::transform(std::begin(container), std::end(container),std::begin(container),
				  std::bind(std::multiplies<value_type_decayed>{}, std::placeholders::_1, 3));
}
 
int main()
{
	int t[] = { 3, 4, 5 };
	tripleElements(t);
 
	for(auto e : t)
		std::cout << e << " ";
 
	return 0;
}
 

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