crtp_cast

C++ Grammar ATL/WTL
  • ATL/WTLではCRTPというテクニックを多用している
    • これはtemplateを使ったTemplate Methodパターンである(ややこしい)
  • static_castが使えるが意味が多すぎるので避けたい、そこで・・・ダウンロード
  • キャストさえ面倒な人にはauto_derived

[]#include[] []<pstade/crtp_cast.hpp>[]




[]template[][]< [][]class[] []Derived[][] >[]

[]struct[] []WindowBase[]

[]{[]

  []void[] []create[][]()[]

[]  {[]

    []pstade[][]::[][]crtp_cast[][]<[][]Derived[][]>([][]this[][]).[][]create_impl[][]();[]
    []Derived[][]& [][]d[][] = [][]pstade[][]::[][]auto_derived[][]([][]this[][]);[]

    []d[][].[][]create_impl[][]();[]
    []Derived[][]* [][]pd[][] = [][]pstade[][]::[][]auto_derived[][]([][]this[][]);[]

    []pd[][]->[][]create_impl[][]();[]

[]  }[]
  []void[] []show[][]() [][]const[]

[]  {[]

    []pstade[][]::[][]crtp_cast[][]<[][]const[] []Derived[][]>([][]this[][]).[][]show_impl[][]();[]
    []const[] []Derived[][]& [][]d[][] = [][]pstade[][]::[][]auto_derived[][]([][]this[][]);[]

    []d[][].[][]show_impl[][]();[]
    []const[] []Derived[][]* [][]pd[][] = [][]pstade[][]::[][]auto_derived[][]([][]this[][]);[]

    []pd[][]->[][]show_impl[][]();[]

[]  }[]

[]};[]
[]struct[] []Window[][] : [][]WindowBase[][]< [][]Window[][] >[]

[]{[]

  []void[] []create_impl[][]()[]

[]  {[]

    []pstade[][]::[][]print[][]([][]"Window::create_impl"[][]);[]

[]  }[]
  []void[] []show_impl[][]() [][]const[]

[]  {[]

    []pstade[][]::[][]print[][]([][]"Window::show_impl"[][]);[]

[]  }[]

[]};[]
[]struct[] []Dialog[][] : [][]WindowBase[][]< [][]Dialog[][] >[]

[]{[]

  []void[] []create_impl[][]()[]

[]  {[]

    []pstade[][]::[][]print[][]([][]"Dialog::create_impl"[][]);[]

[]  }[]
  []void[] []show_impl[][]() [][]const[]

[]  {[]

    []pstade[][]::[][]print[][]([][]"Dialog::show_impl"[][]);[]

[]  }[]

[]};[]