Boost.Futures - p

Herb Sutterの講演に出てきた物がもうあった
マルチスレッドプログラミングをモダンなシンタックスで支援する
実装にBoost.Fusionを使っている



[]#include[] []<iostream>[] []// for std::cin[]

[]#include[] []<boost/assert.hpp>[]

[]#include[] []<boost/bind.hpp>[]

[]#include[] []<boost/concept_check.hpp>[] []// for ignore_unused_variable_warning[]

[]#include[] []<boost/cstdlib.hpp>[] []// for exit_success[]



[]#pragma[][] warning(push)[]

  []#pragma[][] warning(disable: 4100 4180 4355 4511 4512)[]

  []#include[] []<boost/futures.hpp>[]

  []#include[] []<boost/spirit/fusion/sequence/get.hpp>[]

  []#include[] []<boost/spirit/fusion/sequence/tuple.hpp>[]

[]#pragma[][] warning(pop)[]
[]int[] []factorial[][]([][]int[] []n[][]) {[]

  []return[] []n[][] == [][]0[][] ? [][]0[][] : ([][]n[][] == [][]1[][] ? [][]1[][] : [][]n[][] * [][]factorial[][]([][]n[][]-1[][]));[]

[]}[]
[]namespace[] []futures[][] = [][]boost[][]::[][]futures[][];[]

[]namespace[] []fusion[][] = [][]boost[][]::[][]fusion[][];[]
[]int[] []main[][]([][]int[] []argc[][], [][]char[][] *[][]argv[][][])[]

[]{[]

  []futures[][]::[][]simple_future[][]<[][]int[][]> [][]f1[][] = [][]boost[][]::[][]bind[][]([][]factorial[][], [][]4[][]);[]

  []futures[][]::[][]simple_future[][]<[][]int[][]> [][]f2[][] = [][]boost[][]::[][]bind[][]([][]factorial[][], [][]6[][]);[]

  []futures[][]::[][]simple_future[][]<[][]int[][]> [][]f3[][] = [][]boost[][]::[][]bind[][]([][]factorial[][], [][]8[][]);[]
  []typedef[] []fusion[][]::[][]tuple[][]<[][]int[][], [][]int[][], [][]int[][]> [][]result_t[][];[]

  []futures[][]::[][]future[][]<[][]result_t[][]> [][]f_and[][] = [][]f1[][] && [][]f2[][] && [][]f3[][];[]

  []result_t[] []result[][] = [][]f_and[][]();[]

  

  []BOOST_ASSERT[][]([]

    []fusion[][]::[][]get[][]<[][]0[][]>([][]result[][]) == [][]24[][] &&[]

    []fusion[][]::[][]get[][]<[][]1[][]>([][]result[][]) == [][]720[][] &&[]

    []fusion[][]::[][]get[][]<[][]2[][]>([][]result[][]) == [][]40320[]

[]  );[]
  []std[][]::[][]cin[][].[][]ignore[][](); [][]// makes ~visitor_registry succeed...[]
  []boost[][]::[][]ignore_unused_variable_warning[][](([][]argc[][], [][]argv[][]));[]

  []return[] []boost[][]::[][]exit_success[][];[]

[]}[]