multidim

multidim::unique_copy

template <typename InputIt, typename OutputIt>
constexpr inline OutputIt unique_copy(InputIt first, InputIt last, OutputIt d_first);

template <typename InputIt, typename OutputIt, typename BinaryPredicate>
constexpr inline OutputIt unique_copy(InputIt first, InputIt last, OutputIt d_first, BinaryPredicate p);

These functions are similar to std::unique_copy, but they are guaranteed not to construct any temporary elements. Because of this, multidim::unique_copy has the following requirements:

• InputIt must meet the requirements of LegacyInputIterator
• OutputIt must meet the requirements of LegacyOutputIterator
• *std::declval<OutputIt>() = *std::declval<InputIt>() must be valid
• If InputIt does not meet the requirements of LegacyForwardIterator, then OutputIt must meet the requirements of LegacyForwardIterator and *std::declval<OutputIt>() == *std::declval<InputIt>() (or p(*std::declval<OutputIt>(), *std::declval<InputIt>()) for predicate version) must be valid and convertible to bool
  Otherwise *std::declval<InputIt>() == *std::declval<InputIt>() (or p(*std::declval<InputIt>(), *std::declval<InputIt>()) for predicate version) must be valid and convertible to bool

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