Boost.UnicodeIterator

• Boost.Regexにこっそりあるのを発見
• utf8_codecvt_facetというのもあるらしい
• 以下、UTF-8のxmlファイルからコメントを抽出するコード
  • ところで、をインクルードすると、std::equalがstd::mismatchを'std::'を付けずに呼び出している(実装がある)ので、それによって引き起こされるADLがBoost.RangeExのboost::mismatchに侵入し、コンパイルエラーになります
  • ADLは本当に危険で、エラーの場所を見つけるのも難しいです

[]#include[] []<algorithm>[]

[]#include[] []<fstream>[]

[]#include[] []<iterator>[]

[]#include[] []<string>[]

[]#include[] []<boost/range/iterator_range.hpp>[]

[]// #include <boost/range_ex/algorithm.hpp> killed by std::equal[]

[]#include[] []<boost/regex/pending/unicode_iterator.hpp>[]

[]#include[] []<boost/spirit/iterator/file_iterator.hpp>[]
[]#include[] []<biscuit/biscuit.hpp>[]
[]namespace[] []xml_grammar[][] {[]
  []using[] []namespace[] []biscuit[][];[]
  []struct[] []comment[][] :[]

    []seq[][]<[]

      []chseq[][]<[][]'<'[][],[][]'!'[][],[][]'-'[][],[][]'-'[][]>,[]

      []star[][]<[]

        []or_[][]<[]

          []minus[][]< [][]any[][], [][]chseq[][]<[][]'-'[][]> >,[]

          []seq[][]<[]

            []chseq[][]<[][]'-'[][]>,[]

            []minus[][]< [][]any[][], [][]chseq[][]<[][]'-'[][]> >[]

[]          >[]

[]        >[]

[]      >,[]

      []chseq[][]<[][]'-'[][],[][]'-'[][],[][]'>'[][]>[]

[]    >[]

[]  { };[]
[]} [][]// namespace xml_grammar[]
[]// from Boost.Spirit, random-access iterator[]

[]typedef[] []boost[][]::[][]spirit[][]::[][]file_iterator[][]<> [][]ifiter_t[][];[]
[]// from Boost.Regex, bidirectional iterator[]

[]typedef[] []boost[][]::[][]u8_to_u32_iterator[][]<[][]ifiter_t[][]> [][]uiiter_t[][];[]
[]// from Boost.Regex, output iterator[]

[]typedef[] []boost[][]::[][]utf8_output_iterator[][]< [][]std[][]::[][]ostream_iterator[][]<[][]char[][]> > [][]uoiter_t[][];[]
[]int[] []main[][]([][]int[] []argc[][], [][]char[][] *[][]argv[][][])[]

[]{[]

  []for[][] ([][]int[] []i[][] = [][]1[][]; [][]i[][] < [][]argc[][]; ++[][]i[][]) {[]
    []std[][]::[][]string[] []ifname[][]([][]argv[][][[][]i[][]]);[]

  

    []ifiter_t[] []iffirst[][]([][]ifname[][].[][]c_str[][]());   []

    []boost[][]::[][]iterator_range[][]<[][]uiiter_t[][]> [][]uirng[][]([][]iffirst[][], [][]iffirst[][].[][]make_end[][]());[]

    

    []std[][]::[][]ofstream[] []fout[][](([][]ifname[][] + [][]".comments.xml"[][]).[][]c_str[][](), [][]std[][]::[][]ios[][]::[][]binary[][]);[]
    []fout[][] << [][]"<?xml version=\"1.0\" encoding=\"UTF-8\"?><comments>"[][];[]

[]    {[]

      []biscuit[][]::[][]filter_range[][]<[]

        []xml_grammar[][]::[][]comment[][], [][]boost[][]::[][]iterator_range[][]<[][]uiiter_t[][]>[]

[]      > [][]cmtrng[][]([][]uirng[][]);[]
      []std[][]::[][]copy[][]([]

        []boost[][]::[][]begin[][]([][]cmtrng[][]), [][]boost[][]::[][]end[][]([][]cmtrng[][]),[]

        []uoiter_t[][]([][]std[][]::[][]ostream_iterator[][]<[][]char[][]>([][]fout[][]))[]

[]      );[]

[]    }[]

    []fout[][] << [][]"</comments>"[][];[]
[]  } [][]// for[]
  []return[] []0[][];[]

[]}[]
[]// Another candidate :[]

[]//   http://www.boost.org/libs/serialization/doc/codecvt.html[]