Boost regex运行时错误 [英] Boost regex runtime error

问题描述

我试图使用我在另一台计算机上编写的将字符串拆分为令牌的代码。这段代码编译得很好。该代码还在其他计算机上工作。我已经设法将代码减少到以下：

  #include< string> 
 #include< boost / regex.hpp> 
 
 typedef std :: vector< std :: string> token_t; 
 
 token_t generate_tokens（std :: string raw_input）{
 //此函数将输入字符串拆分为标记。所以测试100进入2个令牌测试和100。 
 
 boost :: regex re_splitter（\\s +）; //这使用正则表达式\s +来查找空格。 +查找一个或多个空格字符。 
 
 boost :: sregex_token_iterator iter（raw_input.begin（），raw_input.end（），re_splitter，-1）; 
 //这会打破字符串使用regex re_splitter分裂成令牌时，找到。 
 boost :: sregex_token_iterator j; //这实际上是在Boost的例子中，j是等效的end。是的，这也似乎对我来说很奇怪... 
 
 token_t token_vector; 
 unsigned int count = 0; 
 while（iter！= j）
 {
 token_vector.push_back（* iter）; 
 std :: cout<< * iter ++<< std :: endl; 
 ++ count; 
} 
 return token_vector; 
} 
 
 int main（）{
 std :: string in; 
 int amount = -1; 
 
 std :: cout<< action：; 
 std :: getline（std :: cin，in）; 
 
 boost :: regex EXPR（^ test \\d *（\\.\\d {1,2}）？$）; 
 bool format_matches = boost :: regex_match（in，EXPR）; 
 
 token_t tokens = generate_tokens（in）; 
 
 if（format_matches）{
 amount = atoi（tokens.at（1）.c_str（））; 
} 
 std :: cout<< amount：<量< \\\
; 
 return 0; 
} 
  

使用以下命令编译没有错误或警告： g ++ - Wall test.cpp -lboost_regex
但是在运行时使用时提供输入 test 100 程序失败。

action：test 100

a.out：/ usr / local / include / boost / smart_ptr / shared_ptr.hpp：412：typename boost :: detail :: shared_ptr_traits :: reference boost :: shared_ptr :: operator *（）const [with T = boost :: regex_traits_wrapper>>]：Assertion`px！= 0'failed。 / p>

已中止

。这是一个错误在我的代码或在库中？

解决方案

由于您不使用 shared_ptr 在代码中，我可以看到没有其他的东西看起来错误，它在其他机器上工作，我会说这可能是Boost.Regex的一个错误。

我敢打赌其他机器都安装了其他版本的boost？

如果我不得不猜测，我会尝试更改 std :: cout < * iter ++<< std :: endl; 行首。 - > std :: cout<< * iter<< std :: endl; ++ iter; 。

然后，在像Swiss建议的调试器中运行它，看看断言触发的地方。 >

I'm trying to use some code that I wrote on another computer that splits a string into tokens. This code compiles fine. The code also works as intended on some other computers. I've managed to reduce the code down to the following:

#include <string>
#include <boost/regex.hpp>

typedef std::vector<std::string> token_t ;

token_t generate_tokens(std::string raw_input){ 
//this function breaks a input string into tokens. So test 100 goes to 2 tokens "test" and "100".

    boost::regex re_splitter("\\s+"); //this uses the regex \s+ to find whitespace. The + finds one or more whitespace characters.

    boost::sregex_token_iterator iter(raw_input.begin(), raw_input.end(), re_splitter, -1);
    //this breaks the string using the regex re_splitter to split into tokens when that is found. 
    boost::sregex_token_iterator j; //This is actually in the Boost examples, j is the equivalent of end. Yes this did also seem weird to me at first...

    token_t token_vector;
    unsigned int count = 0;
    while(iter != j)
    {
        token_vector.push_back(*iter);
        std::cout << *iter++ << std::endl;
        ++count;
    }
    return token_vector;
}

int main(){
    std::string in;
    int amount = -1;

    std::cout << "action: ";
    std::getline(std::cin, in);

    boost::regex EXPR("^test \\d*(\\.\\d{1,2})?$");
    bool format_matches = boost::regex_match(in, EXPR);

    token_t tokens = generate_tokens(in);

    if(format_matches){
        amount = atoi(tokens.at(1).c_str());
    }
    std::cout << "amount: " << amount << "\n";
    return 0;
}

This compiles without errors or warnings using: g++ -Wall test.cpp -lboost_regex but when used at runtime providing the input test 100 the program fails.

action: test 100

a.out: /usr/local/include/boost/smart_ptr/shared_ptr.hpp:412: typename boost::detail::shared_ptr_traits::reference boost::shared_ptr::operator*() const [with T = boost::regex_traits_wrapper > >]: Assertion `px != 0' failed.

Aborted

I'm completely lost as to what is going on here. Is this a bug in in my code or in the library? Any advice for debugging this is greatly appreciated!

解决方案

Since you're not using shared_ptr in your code, and I can see no other stuff that looks wrong AND it works on other machines, I'd say it's probably a bug in Boost.Regex.

I bet the other machines have other versions of boost installed?

If I had to guess I'd try changing the std::cout << *iter++ << std::endl; line first. -> std::cout << *iter << std::endl; ++iter;.

And yeah, run it in a debugger like Swiss suggested, and see where the assertion is triggered.

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