Visual Studio 2010中'getline'的无限循环

Question

我正在通过Visual Studio 2010中的一些C++练习工作，并且当我尝试使用“CTRL-Z”终止标准流时出现无限循环“，当使用getline()功能。这里是不是不要我了while循环的代码的相关位....

// find all the lines that refer to each word in the input 
map<string, vector<int> > 
    xref(istream& in, 
     vector<string> find_words(const string&) = split) 
{ 
    string line; 
    int line_number = 0; 
    map<string, vector<int> > ret; 

    // read the next line 
    while (getline(in, line)) { 
     ++line_number; 

     // break the input line into words 
     vector<string> words = find_words(line); 

     // remember that each word occurs on the current line 
     for (vector<string>::const_iterator it = words.begin(); 
      it != words.end(); ++it) 
      ret[*it].push_back(line_number); 
    } 
    return ret; 
} 

...，程序进入无限循环打印随机整数。我很确定这是我缺少的Windows环境特有的东西。这里是整个代码...

#include <algorithm> 
#include <cctype> 
#include <string> 
#include <vector> 

#include "split.h" 

using std::find_if; 
using std::string; 
using std::vector; 

using std::isspace; 

// `true' if the argument is whitespace, `false' otherwise 
bool space(char c) 
{ 
    return isspace(c); 
} 

// `false' if the argument is whitespace, `true' otherwise 
bool not_space(char c) 
{ 
    return !isspace(c); 
} 

vector<string> split(const string& str) 
{ 
    typedef string::const_iterator iter; 
    vector<string> ret; 

    iter i = str.begin(); 
    while (i != str.end()) { 

     // ignore leading blanks 
     i = find_if(i, str.end(), not_space); 

     // find end of next word 
     iter j = find_if(i, str.end(), space); 

     // copy the characters in `[i,' `j)' 
     if (i != str.end()) 
      ret.push_back(string(i, j)); 
     i = j; 
    } 
    return ret; 
} 

#include <map> 
#include <iostream> 
#include <string> 
#include <vector> 

#include "split.h" 

using std::cin;   using std::cout; 
using std::endl;   using std::getline; 
using std::istream;  using std::string; 
using std::vector;   using std::map; 

// find all the lines that refer to each word in the input 
map<string, vector<int> > 
    xref(istream& in, 
     vector<string> find_words(const string&) = split) 
{ 
    string line; 
    int line_number = 0; 
    map<string, vector<int> > ret; 

    // read the next line 
    while (getline(in, line)) { 
     ++line_number; 

     // break the input line into words 
     vector<string> words = find_words(line); 

     // remember that each word occurs on the current line 
     for (vector<string>::const_iterator it = words.begin(); 
      it != words.end(); ++it) 
      ret[*it].push_back(line_number); 
    } 
    return ret; 
} 

int main() 
{ 
    // call `xref' using `split' by default 
    map<string, vector<int> > ret = xref(cin); 

    // write the results 
    for (map<string, vector<int> >::const_iterator it = ret.begin(); 
     it != ret.end(); ++it) { 
     // write the word 
     cout << it->first << " occurs on line(s): "; 

     // followed by one or more line numbers 
     vector<int>::const_iterator line_it = it->second.begin(); 
     cout << *line_it; // write the first line number 

     ++line_it; 
     // write the rest of the line numbers, if any 
     while (line_it != it->second.end()) { 
      cout << ", " << *line_it; 
      ++line_it; 
     } 
     // write a new line to separate each word from the next 
     cout << endl; 
    } 

    return 0; 
} 

Answer 1

我想，而不是试图使这项工作，我想通过编写代码，我可以理解开始（和我的理解，代码必须是相当简单） ：

#include <map> 
#include <iostream> 
#include <string> 
#include <vector> 
#include <sstream> 
#include <iterator> 
#include "infix_iterator.h" 

typedef std::map<std::string, std::vector<unsigned> > index; 

namespace std { 
ostream &operator<<(ostream &os, index::value_type const &i) { 
    os << i.first << ":\t"; 
    std::copy(i.second.begin(), i.second.end(), 
     infix_ostream_iterator<unsigned>(os, ", ")); 
    return os; 
} 
} 

void add_words(std::string const &line, size_t num, index &i) { 
    std::istringstream is(line); 
    std::string temp; 

    while (is >> temp) 
     i[temp].push_back(num); 
} 

int main() { 
    index i; 
    std::string line; 
    size_t line_number = 0; 

    while (std::getline(std::cin, line)) 
     add_words(line, ++line_number, i); 

    std::copy(i.begin(), i.end(), 
     std::ostream_iterator<index::value_type>(std::cout, "\n")); 
    return 0; 
} 

由于（或多或少）通常，这需要我已经张贴elsewhere的infix_ostream_iterator。