c++ max float from vector code example

Example 1: c++ max and min of vector

auto it = max_element(std::begin(cloud), std::end(cloud)); // c++11

Example 2: c++ max and min of vector

template <typename T, size_t N> const T* mybegin(const T (&a)[N]) { return a; }    
template <typename T, size_t N> const T* myend  (const T (&a)[N]) { return a+N; }