permutation.hpp

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#pragma once
 
#include <algorithm>
 
#include "NumCpp/Core/Internal/StaticAsserts.hpp"
#include "NumCpp/Functions/arange.hpp"
#include "NumCpp/NdArray.hpp"
#include "NumCpp/Random/generator.hpp"
 
namespace nc::random
{
    namespace detail
    {
        //============================================================================
        // Method Description:
        template<typename dtype, typename GeneratorType = std::mt19937>
        NdArray<dtype> permutation(GeneratorType& generator, dtype inValue)
        {
            STATIC_ASSERT_ARITHMETIC(dtype);
 
            NdArray<dtype> returnArray = arange(inValue);
            std::shuffle(returnArray.begin(), returnArray.end(), generator);
            return returnArray;
        }
 
        //============================================================================
        // Method Description:
        template<typename dtype, typename GeneratorType = std::mt19937>
        NdArray<dtype> permutation(GeneratorType& generator, const NdArray<dtype>& inArray)
        {
            STATIC_ASSERT_ARITHMETIC(dtype);
 
            NdArray<dtype> returnArray(inArray);
            std::shuffle(returnArray.begin(), returnArray.end(), generator);
            return returnArray;
        }
    } // namespace detail
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> permutation(dtype inValue)
    {
        return detail::permutation(generator_, inValue);
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> permutation(const NdArray<dtype>& inArray)
    {
        return detail::permutation(generator_, inArray);
    }
} // namespace nc::random