( ﾉ╹◡◡╹)ﾉ Raku の `.pick` と `.roll` を C++ で再現してみた

random_extensions.hxx

#pragma once

#include <random>

int32_t pick( std::mt19937_64 &engine, int32_t min, int32_t max ) {
    std::uniform_int_distribution<> dist( min, max );

    return dist( engine );
}

template <class _Populate_Iterator, class _Sample_Iterator, class _Distance, class _Uniform_Random_Bit_Generator>
_Sample_Iterator roll( _Populate_Iterator            first,
                       _Populate_Iterator            last,
                       _Sample_Iterator              dest,
                       _Distance                     count,
                       _Uniform_Random_Bit_Generator randomizer ) {
    size_t                                max = std::distance( first, last );
    std::uniform_int_distribution<size_t> dist( 0, max - 1 );

    for ( _Distance i = 0; i < count; i++ ) {
        auto offset = dist( randomizer );

        *dest       = *( first + offset );

        dest++;
    }
    return dest;
}