在构建时成功但在没有调试的情况下运行失败

Question

Q值。有人能指出这段代码中的错误吗？

也许周期出现了错误？

 for (; it != reg_end; ++it)

代码应该读取文本并查找具有相同开头和结尾字母的单词数（例如，“runner”，“streets”等）。用于数据的文本位于同一文件夹中。代码在构建时成功但在没有调试的情况下运行失败，出现错误......这是完整的代码：

#include <fstream>  
#include <iostream>   // first error was here
#include <iomanip>
#include <string>
#include <regex>  
using namespace std;   
const string Cdfv = "Data.txt";
//------------------------------------------------------------
/** Class for counting words with the same begin 
  and end letters.
  Inherits string. */
class row: public string {
public:
    int equalBE(regex & re);
};
//------------------------------------------------------------
/** Finds and returns a number in a row of words, which begin 
  and end with the same letter. */
int row::equalBE(regex & re)
{
  int equalQuantity = 0;
  string word;
  sregex_token_iterator it(begin(), end(), re, -1);
  sregex_token_iterator reg_end;
  for (; it != reg_end; ++it) {
   word = it->str();           // second error was here, there was no ; mark 
   cout << word << endl;
   if (word[0] == word[word.length()-1])
      equalQuantity++;
  }
  return equalQuantity;
}
//------------------------------------------------------------
int AnalyseText(string dfv, regex & re);
//------------------------------------------------------------
int main()
{
  string punct = "[\\s,.;:-!?()]+";    // punctuation marks between words in a row
  regex re(punct);
  cout << "Number of words: " << AnalyseText(Cdfv, re) << endl;
  return 0;
}
//------------------------------------------------------------
/** Counts and return number of words in a text,
  which begin and end with the same letter */
int AnalyseText(string dfv, regex & re)
{
  int equalQuantity = 0;
  ifstream fd(dfv.c_str());
  row rw;         
  while (!fd.eof()) {
    getline(fd, rw);
    equalQuantity += rw.equalBE(re);
  }
  fd.close();
  return equalQuantity;
}
//------------------------------------------------------------

编辑：这是我得到的错误：

  

---

     

Microsoft Visual C ++运行时库

     

调试错误！

     

程序：... klaidos pavyzdy \ Zodziu_isskyrimas \ Debug \ Zodziu_isskyrimas.exe

     

R6010

     

  
• abort（）被称为
  

     

（按“重试”调试应用程序）

     

---

     

中止重试忽略

编辑：这是我在“调用堆栈”窗口中获得的内容：

    KernelBase.dll!761ec42d()   Unknown
    [Frames below may be incorrect and/or missing, no symbols loaded for KernelBase.dll]    
>   msvcr110d.dll!_CxxThrowException(void * pExceptionObject, const _s__ThrowInfo * pThrowInfo) Line 152    C++
    msvcp110d.dll!std::_Xregex_error(std::regex_constants::error_type _Code) Line 50    C++
    Zodziu_isskyrimas.exe!std::_Parser<std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > >,char,std::regex_traits<char> >::_Error(std::regex_constants::error_type _Code) Line 4757   C++
    Zodziu_isskyrimas.exe!std::_Parser<std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > >,char,std::regex_traits<char> >::_ClassRanges() Line 5093   C++
    Zodziu_isskyrimas.exe!std::_Parser<std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > >,char,std::regex_traits<char> >::_CharacterClass() Line 5117    C++
    Zodziu_isskyrimas.exe!std::_Parser<std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > >,char,std::regex_traits<char> >::_Alternative() Line 5420   C++
    Zodziu_isskyrimas.exe!std::_Parser<std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > >,char,std::regex_traits<char> >::_Disjunction() Line 5466   C++
    Zodziu_isskyrimas.exe!std::_Parser<std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > >,char,std::regex_traits<char> >::_Compile() Line 5498   C++
    Zodziu_isskyrimas.exe!std::basic_regex<char,std::regex_traits<char> >::_Reset<std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > > >(std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > > _First, std::_String_const_iterator<std::_String_val<std::_Simple_types<char> > > _Last, std::regex_constants::syntax_option_type _Flags, std::forward_iterator_tag __formal) Line 2515 C++
    Zodziu_isskyrimas.exe!std::basic_regex<char,std::regex_traits<char> >::basic_regex<char,std::regex_traits<char> ><std::char_traits<char>,std::allocator<char> >(const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & _Str, std::regex_constants::syntax_option_type _Flags) Line 2292   C++
    Zodziu_isskyrimas.exe!main() Line 42    C++
    Zodziu_isskyrimas.exe!__tmainCRTStartup() Line 536  C
    Zodziu_isskyrimas.exe!mainCRTStartup() Line 377 C
    kernel32.dll!772a338a() Unknown
    ntdll.dll!77eb9f72()    Unknown
    ntdll.dll!77eb9f45()    Unknown

Answer 1

如果您查看for循环，则it无法在任何地方启动表单。它应该有一个起点，例如it = 0或其他。

  for (; it != reg_end; ++it) { // The prog. is failing dying for this
   word = it->str();           
   cout << word << endl;
   if (word[0] == word[word.length()-1])
      equalQuantity++;
  }

此外，如果您的reg_end未正确初始化（仅因某人的评论而被注意到），则可能导致＆＃34;未定义的行为＆＃34;这可能会导致问题。好像你正在开始一个for循环来自＆＃34; Somewhere＆＃34;并运行它直到＆＃34;某些东西不满意＆＃34;每增加一步......

Answer 2

这是因为字符串

"[\\s,.;:-!?()]+"

不是ECMAScript syntax中的有效正则表达式。所以代码：

    string punct = "[\\s,.;:-!?()]+";    // punctuation marks between words in a row
  regex re(punct);

抛出一个std :: regex_error，而没有代码捕获它，所以它崩溃了。它与调试或发布版本无关。

类型regex是basic_regex，默认情况下，它使用ECMAScript语法构造正则表达式。如果您只是删除＆＃34;！？＆＃34;在字符串中，它修复了错误。