C++ Variadics


Problem Statement :


A template parameter pack is a template parameter that accepts zero or more template arguments (non-types, types, or templates). To read more about parameter pack, click here.

Create a template function named reversed_binary_value. It must take an arbitrary number of bool values as template parameters. These booleans represent binary digits in reverse order. Your function must return an integer corresponding to the binary value of the digits represented by the booleans. For example: reversed_binary_value<0,0,1>() should return 4 .

Input Format

The first line contains an integer, t , the number of test cases. Each of the t subsequent lines contains a test case. A test case is described as 2 space-separated integers, x and y , respectively.

x is the value to compare against.
y represents the range to compare: 64 * y  to  64 * y + 63.

Constraints

   0  <=  x <=  65535
   0  <=  y <=   1023

The number of template parameters passed to reversed_binary_value will be  <= 16.

Output Format

Each line of output contains 64 binary characters (i.e.,0 's and 1's). Each character represents one value in the range. The first character corresponds to the first value in the range. The last character corresponds to the last value in the range. The character is 1 if the value in the range matches  X; otherwise, the character is 0.


Solution :



title-img 


                            Solution in C :

template <bool... digits>
struct Solver;
    
template <bool Head, bool... Tail>
struct Solver<Head, Tail...>
{
    static int value()
    {
        return Head + 2 * Solver<Tail...>::value();
    }
};

template <>
struct Solver<>
{
    static int value()
    {
        return 0;
    }
};

template <bool... digits>
int reversed_binary_value()
{
    return Solver<digits...>::value();
}








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