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POwhere the segmentation fault is generated in this code?
 

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  1. POwhere the segmentation fault is generated in this code?
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    <pre><code>class Transaction //TO store a transaction read from file { public: int maxlenth; int length1,length2; vector&lt;string&gt; *items; vector&lt;int&gt; *share; int tmv; Transaction():maxlenth(Translen),length1(0),length2(0) { items=new vector&lt;string&gt;(maxlenth); share=new vector&lt;int&gt;(maxlenth); } ~Transaction() { delete items; delete share; } void set_tmv() { tmv=0; for(int i=0;i&lt;=length2;i++) tmv=tmv+(*share)[i]; } }; class Data { public: ifstream in; Data(char *filename); ~Data(); Transaction&amp; getnextTransaction(Transaction &amp;Trans); }; Data::Data(char *filename) { ifstream in(filename); assure(in,filename); } Data::~Data() { in.close(); } Transaction&amp; Data::getnextTransaction(Transaction &amp;Trans) { const char* delimiters = " \t;()\"&lt;&gt;:{}[]+-=&amp;*#.,/\\~"; //ifstream in("testdata.txt"); //set&lt;string&gt;Items1; vector&lt;string&gt; v(5); int i=0; string line; getline(in, line); char* s =strtok((char*)line.c_str(), delimiters); while(s) { if(i==v.size()) v.resize(v.size()*2); v[i++]=s; s = strtok(0, delimiters); } vector&lt;string&gt;::iterator it=v.begin(); int j=0; while(j&lt;50) { (*Trans.items)[(Trans.length1)++]=v[j]; j=j+2; } j=1; while(j&lt;=50) { (*Trans.share)[Trans.length2++]=(atoi(v[j].c_str())); j=j+2; } //copy(v.begin(),v.end(),ostream_iterator&lt;string&gt;(cout,"\n"); return Trans; } int main() { Data d("testdata.txt"); Transaction t,q; d.getnextTransaction(t); t.set_tmv(); return 0; } </code></pre> <p>While I am debugging with gdb, I am geting something like:</p> <blockquote> <p>Programm recieved SIGSEGV segmentation fault in std::string::assign(std::string const &amp;)</p> </blockquote> <p>While I am including the line <code>ifstream in("testdata.txt")</code> in function <code>getNexttransaction()</code>, I am not getting any error.</p> <p>What's going wrong?</p>
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    1. USforsvarir
    1. USuser764878
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    1. PO
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      1. POwhere the segmentation fault is generated in this code?
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      1. VTDownMod
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      1. POwhere the segmentation fault is generated in this code?
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      1. VTUpMod
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      1. POwhere the segmentation fault is generated in this code?
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      1. VTDownMod
    1. COI don't think the error comes from there, but make sure to use the `const char*` type for string literals, as in `Data`'s constructor.
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      1. POwhere the segmentation fault is generated in this code?
      1. USBastien Léonard
    2. COwhat does bt (in gdb) prints after the segfault?
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      1. POwhere the segmentation fault is generated in this code?
      1. USGeorge Kastrinis
    3. COYou *really* want to define a copy constructor and assignment operator for this class or they're going to cause you all sorts of headaches when they are implicitly called.
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      1. POwhere the segmentation fault is generated in this code?
      1. USChris Frederick
 

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