Boost Semantic Actionの関数からコンテナ（今回はベクター）にアクセスすることができる。
11std::vector<string> v;
13struct AddrParse : grammar<AddrParse>
14{
15 struct MyAction
16 {
17 template<typename Ite>
18 void operator()( Ite i1, Ite i2 ) const
19 { cout << "文字数：" << i2 - i1 << endl
20 << " 内容：" << string(i1,i2) << endl;
21 v.push_back(string(i1,i2));
22 }
23 };
24
25 template<typename ScannerT>
26 struct definition
27 {
28 typedef rule<ScannerT> rule_t;
29 rule_t r;
30 definition( const AddrParse& self )
31 {
32 // r = 'a' >> (*ch_p('b'))[MyAction()] >> 'c';
33 r = (int_p >> '.' >> int_p >> '.' >> int_p >> '.' >> int_p)[MyAction()]; // >> +( '*' >> int_p );
34 }
35 const rule_t& start() const { return r; }
36 };
37};
+c++ 21 v.push_back(string(i1,i2)); 33 r = (int_p >> '.' >> int_p >> '.' >> int_p >> '.' >> int_p)[MyAction()]; // >> +( '*' >> int_p ); +
33行目で、セマンティックアクションの関数MyAction()を呼び出し、21行目でベクトルにパースした文字列を格納している。
パース後のベクターの表示は、よくやる方法で、イテレータを使う。
+c++ 103 for(auto itr = v.begin(); itr != v.end(); ++itr) { 104 cout << string(*itr) << endl; 105 } +
コードを見てみる。。。
1#include <iostream>
2#include <fstream>
3#include <sstream>
4#include <string>
5#include <boost/spirit.hpp> 6#include <boost/tokenizer.hpp>
7
8using namespace std;
9using namespace boost::spirit;
10
11std::vector<string> v;
12
13struct AddrParse : grammar<AddrParse>
14{
15 struct MyAction
16 {
17 template<typename Ite>
18 void operator()( Ite i1, Ite i2 ) const
19 { cout << "文字数：" << i2 - i1 << endl
20 << " 内容：" << string(i1,i2) << endl;
21 v.push_back(string(i1,i2));
22 }
23 };
24
25 template<typename ScannerT>
26 struct definition 27 {
28 typedef rule<ScannerT> rule_t;
29 rule_t r;
30 definition( const AddrParse& self )
31 {
32 // r = 'a' >> (*ch_p('b'))[MyAction()] >> 'c';
33 r = (int_p >> '.' >> int_p >> '.' >> int_p >> '.' >> int_p)[MyAction()]; // >> +( '*' >> int_p );
34 }
35 const rule_t& start() const { return r; }
36 };
37};
38
39std::vector < std::vector< std::string > > parse_csv(const char* filepath)
40{
41 std::vector< std::vector< std::string > > cells;
42 std::string line;
43 std::ifstream ifs(filepath);
44
45 while (std::getline(ifs, line)) {
46
47 std::vector< std::string > data;
48
49 boost::tokenizer< boost::escaped_list_separator< char > > tokens(line);
50 for (const std::string& token : tokens) {
51 data.push_back(token);
52 }
53
54 cells.push_back(data);
55 }
56
57 return cells;
58}
実行してみる（IPアドレスの値はランダムに生成）
$ g++ -o random_data random_data.cpp
$ ./random_data 3
$ cat random_data.txt
"2019/07/02 02:02:00.839","2019/07/02 02:02:00","2019/07/02 02:02:00","841","*.178.167.132","25846","iy","*.215.218.225","51321","bu","8MP","VX13Gpdkt","drN","deETa","gyAY4gdZ","8","TJoPPQuOKvrxzAjCd11rpqqSqs","912","198","336","769","278","554","rand-pa1"
"2019/07/02 02:02:52.006","2019/07/02 02:02:52","2019/07/02 02:02:52","478","*.40.197.93","41214","ol","*.213.36.241","23907","Vu","OYF","H6zQlnN5X","yV3","P2VPw","9D3viFsS","5","cogAhSIycmvdYl7RaZNjGCsWqj","953","917","636","718","142","607","rand-pa1"
"2019/07/02 12:12:16.086","2019/07/02 12:12:16","2019/07/02 12:12:16","17","*.175.225.23","15918","Hk","*.156.36.246","8994","u1","Tt2","hihIKl4xd","OX5","uj8uP","hKwtE4iF","8","9EuzqcBTUrBjAago2vY5MMugKb","157","401","130","109","999","219","rand-pa1"
$ ./a.out random_data.txt
文字数：15
内容：255.178.167.132
line:0 255.178.167.132
文字数：14
内容：69.215.218.225
line:0 69.215.218.225
文字数：13
内容：104.40.197.93
line:1 104.40.197.93
文字数：13
内容：76.213.36.241
line:1 76.213.36.241
文字数：14
内容：120.175.225.23
line:2 120.175.225.23
文字数：13
内容：55.156.36.246
line:2 55.156.36.246
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