Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Header <boost/algorithm/cxx11/all_of.hpp>

Test ranges to see if all elements match a value or predicate.

Marshall Clow

namespace boost {
  namespace algorithm {
    template<typename InputIterator, typename Predicate> 
      BOOST_CXX14_CONSTEXPR bool 
      all_of(InputIterator, InputIterator, Predicate);
    template<typename Range, typename Predicate> 
      BOOST_CXX14_CONSTEXPR bool all_of(const Range &, Predicate);
    template<typename InputIterator, typename T> 
      BOOST_CXX14_CONSTEXPR bool 
      all_of_equal(InputIterator, InputIterator, const T &);
    template<typename Range, typename T> 
      BOOST_CXX14_CONSTEXPR bool all_of_equal(const Range &, const T &);
  }
}