...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Test ranges to see if only one element matches a value or predicate.
Marshall Clow
namespace boost { namespace algorithm { template<typename InputIterator, typename Predicate> BOOST_CXX14_CONSTEXPR bool one_of(InputIterator, InputIterator, Predicate); template<typename Range, typename Predicate> BOOST_CXX14_CONSTEXPR bool one_of(const Range &, Predicate); template<typename InputIterator, typename V> BOOST_CXX14_CONSTEXPR bool one_of_equal(InputIterator, InputIterator, const V &); template<typename Range, typename V> BOOST_CXX14_CONSTEXPR bool one_of_equal(const Range &, const V &); } }