How to compare C++ string using qsort in c?

Question

I tried to learn the qsort function of the c-library stdlib. This is provided even in c++. But i dont understand how to use them for sorting

Answer 1

You should use the std::sort template function provided by the C++ standard library (in the header file). By default, std::sort uses the less than comparison operator to order elements (std::string already implements operator<). If you need to specify an ordering condition (for example, case insensitive string compare), std::sort allows you to specify an ordering function object.

Example:

#include 
#include 

bool caseInsensitiveOrdering(const std::string& lhs, const std::string& rhs)
{
   // return true if lowercase lhs is less than lowercase rhs
}

int main()
{
    std::string names[] = {"chuck", "amy", "bob", "donna"};
    size_t nameCount = sizeof(names) / sizeof(names[0]);

    // Sort using built-in operator<
    std::sort(names, names + nameCount);

    // Sort using comparison function
    std::sort(names, names + nameCount, &caseInsensitiveOrdering);
}