what are tempkates in c++ and how to use templates code example

Example 1: how to write a template c++

template <class myType>
myType GetMax (myType a, myType b) {
 return (a>b?a:b);
}

Example 2: templates of templates c++

namespace std {
  template<typename t> struct hash<MyClass<t>>
  {
  	size_t operator() (const MyClass<t>& c) const;
  }
}

// You can also do things like

template<template<typename t> class type> func_name<type<t>>();