STL member variable initalization issue with windows API

Question

I am creating a windows app that uses a vector of stings as a member variable. For some reason, I can compile but when it tries to get at any of the vectors members is crashes. the error is 0xC0000005: Access violation reading location 0xcdcdcdd9. in the member function of the vector class.

this is the size() function where it breaks.

size_type capacity() const
{ // return current length of allocated storage
  return (this->_Myend - this->_Myfirst);
}

I am using visual studios 2010.

thank you Django

Answer 1

The problem is not with the STL code but with your code.

Since you didn't paste your code I'll show you an example of how you should be using a vector of strings.

std::vector<std::string> v;
v.push_back("hello");
v.push_back("world!");
//Note the above 2 string literals get implicitly converted to std::string
assert(v.size() == 2);
assert(v[0] == "hello");

Answer 2

in the header.

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

using namespace std;


class Chat
{
protected:
    vector<string> m_buffers;

public:
    Chat();
    ~Chat();
};

in the cpp

Chat::Chat(){
    string init = "test";
    m_buffers.push_back(init); //crash
}
Chat::~Chat(){

}

sorry about the lack of code.... what wa I thinking (face palm)

Answer 3

I've come across this kind of thing before. Most likely cause is a corrupt heap.