Range adapters

C++ Boost.Range
  • Rangeを受け取りRangeを返す関数を連続で呼び出すとき h(g(f(rng))) を rng | f | g | h のように"手続き的に"書ける
  • Boost.RangeExのboost::adaptor名前空間にあります
    • 名前が提案と違って過去分詞ではないので注意
  • 見た目に反して、あるRangeへの実装はすぐにできます
  • 正式にadapterなのかadaptorなのか不明



[]{[]

  []using[] []namespace[] []biscuit[][];[]


  []// functional and lazy![]

  []BOOST_ASSERT[][](([]

    []match[][]< [][]repeat[][]< [][]char_[][]<[][]'D'[][]>, [][]3[][] > >([]

      []boost[][]::[][]make_transform_range[][](                [][]// from Boost.RangeEx[]

        []make_filter_range[][]< [][]not_[][]< [][]char_[][]<[][]'c'[][]> > >([]

          []make_filter_range[][]< [][]not_[][]< [][]char_[][]<[][]'b'[][]> > >([]

            []make_filter_range[][]< [][]not_[][]< [][]char_[][]<[][]'a'[][]> > >([][]"abcdabcdabcd"[][])[]

[]          )[]

[]        ),[]

        []toupper_fun[][]()[]

[]      )[]

[]    )[]

[]  ));[]

  

  []// monad!?[]

  []BOOST_ASSERT[][](([]

    []match[][]< [][]repeat[][]< [][]char_[][]<[][]'D'[][]>, [][]3[][] > >([]

      []"abcdabcdabcd"[][] |[]

        []filtered[][]< [][]not_[][]< [][]char_[][]<[][]'a'[][]> > >() |[]

        []filtered[][]< [][]not_[][]< [][]char_[][]<[][]'b'[][]> > >() |[]

        []filtered[][]< [][]not_[][]< [][]char_[][]<[][]'c'[][]> > >() |[]

        []boost[][]::[][]adaptor[][]::[][]transform[][]([][]toupper_fun[][]())  [][]// from Boost.RangeEx[]

[]    )[]

[]  ));[]

[]}[]