To insert code sample from file we need to copy our sample somewere to _includes directory and use include and highlight liquids to refer it.

For example to show _includes/source/main.cpp C++ file content we can write

{% highlight cpp %} {% include source/main.cpp %} {% endhighlight %}

which results in

#include <iostream>
using std::cout;

int main(int argc, char * argv[])
{
	cout << "hello from c++!\n";
	return 0;
}