A Constant Struggle

Test your C++ programming skills by solving the given puzzle about template argument deduction.

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Puzzle code

Carefully read the code given below:

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#include <iostream>
#include <type_traits>
template <typename T>
void byValue(T t)
{
    std::cout << std::is_const_v<T>; // true if T is const
}
template <typename T>
void byReference(T &t)
{
    std::cout << std::is_const_v<T>; // true if T is const
}
int main()
{
    int nonConstInt = 0;
    const int constInt = 0;
    byValue(nonConstInt);
    byValue(constInt);
    byReference(nonConstInt);
    byReference(constInt);
}

Your task: Guess the output

Try to guess the output of the above code. Attempt the following quiz to assess your understanding.

Q

What is the expected output of the above code?

A)

0000

B)

0001

C)

0101

D)

1010

Let’s discuss this code and output together in the next lesson.

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