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#include <string>
/**
* @brief a function with one template arguments
*
* @tparam T this is the template parameter
*
* @param arg1 argument of type T
*
* @return return value of type T
*/
template <typename T>
T function1(T arg1)
{}
/**
* @brief a function with one template argument specialized for `std::string`
*
* @param arg1 argument of type `std::string`
*
* @return return value of type `std::string`
*/
template <>
std::string function1<std::string>(std::string arg1)
{}
/**
* @brief a function with three template arguments
*
* @tparam T this is the first template parameter
* @tparam U this is the second template parameter
* @tparam N this is the third template parameter, it is a non-type parameter
*
* @param arg1 first argument of type T
* @param arg2 second argument of type U
*
* @return return value of type T
*/
template <typename T, typename U, int N>
T function2(T arg1, U arg2)
{}
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