unique.hpp

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#pragma once
 
#include <complex>
#include <vector>
 
#include "NumCpp/Core/Internal/StaticAsserts.hpp"
#include "NumCpp/Core/Internal/StlAlgorithms.hpp"
#include "NumCpp/Functions/sort.hpp"
#include "NumCpp/NdArray.hpp"
 
namespace nc
{
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> unique(const NdArray<dtype>& inArray)
    {
        STATIC_ASSERT_ARITHMETIC_OR_COMPLEX(dtype);
 
        const auto comp = [](const dtype lhs, const dtype rhs) noexcept -> bool
        { return utils::essentiallyEqual(lhs, rhs); };
 
        const auto sorted = sort(inArray);
 
        std::vector<dtype> res(sorted.size());
        const auto         last = stl_algorithms::unique_copy(sorted.begin(), sorted.end(), res.begin(), comp);
 
        return NdArray<dtype>(res.begin(), last);
    }
} // namespace nc