one line assert to test if STL container is sorted

Question

Is there a way to write a one line condition that would return true if STL container is sorted? The container in question is std::vector

I intend to use it in an assert<

Answer 1

Use adjacent_find in combination with less or greater functor.

Restriction:
You should know whether the container is sorted in ascending or descending.

If the vector is supposed to be sorted in ascending order:

//Checks the first element where adjacent value where elem > nextElem
//returns end if the vector is sorted!
//Complexity is O(n)
vector::iterator pos =  std::adjacent_find (aVec.begin(), aVec.end(),   // range
                                     std::greater());               


if (pos == aVec.end()) 
{
    std::cout<<" sorted"<