Function StrLen

12.02-constexprStrlenCpp111/main.cpp:7–11

#A Define a constexpr function

// #A Define a constexpr function
constexpr size_t StrLen(const char* str)
{
  // #B Use a single return and recursion with the ternary operator
  return *str ? 1 + StrLen(str + 1) : 0;
}

int main()
{