Sorting a vector of objects in C++

Question

struct Keyword
{
    std::string keyword;
    int numUses;
};  

bool sortingVector(const Keyword& key1, const Keyword& key2)
{
    return key1.numUses < key2         


        

Answer 1

This is what a compilable example should look like:

Because you did not provide the exact code that was generating the errors people have given a couple of different types of answer. As a result it is generally a good idea to generate a compilable example the displays the problem.

#include 
#include 
#include 

struct Keyword
{
        std::string keyword;
            int numUses;
};

bool sortingVector(const Keyword& key1, const Keyword& key2)
{
        return key1.numUses < key2.numUses;
}

int main()
{
    std::vector    topKeywords;

    std::sort(topKeywords.begin(), topKeywords.end(), sortingVector);
}

Generally the compiler can do a better job of optimising (I am told) if you use a functor rather than a function pointer.

struct SortingVectorFunctor
{
    bool operator()(const Keyword& key1, const Keyword& key2) const
    {
        return key1.numUses < key2.numUses;
    }
};