std::out_of_range error

[smeaglegolum]

Hi,

I'm trying to code a programme and I'm getting this code when compiling

terminate called after throwing an instance of 'std::out_of_range'
what(): basic_string::replace
Aborted (core dumped)

And the problem arising in due to this part of code

result.replace(pos, key.size(), nkey)

This is part of a larger code.

Can anyone help with me what could be problem.

PS: I had no issue with this code on another Linux machine.

int ApplicationHandler::CountStrings(const string input, const string key)
{

        unsigned int start = 0;
        int c = 0;

        while(true)
        {
                start = input.find(key.c_str(), start + 1)  ;
                if (start == string::npos)
                        break;
        c++;
        }
        return c  ;

}

string ApplicationHandler::ReplaceString(const string input, const string key, const string nkey)
{
        string result = input;
        unsigned int pos;
        while(true)
        {
                pos = result.find(key);
                if (pos == string::npos)
                        break;
                result.replace(pos, key.size(), nkey);
        }
        return result;
}

[vlad from moscow]

I do not see any problem with ReplaceString except that it would be better to define pos as

std::string::size_type pos;

because it is possible that sizeof( unsigned int ) < sizeof( std::string::size_type )

Try to check

std::cout << sizeof( unsigned int ) << std::endl;
std::cout << sizeof( std::string::size_type ) << std::endl;

[clanmjc]

What is the size of result, the actual value of pos, the size of key and size of nkey when this error occurs? Have you looked?

[smeaglegolum]

Hi Vlad,

I have used the std::string::size_type pos; instead of unsigned int pos;

The program runs fine without the error but it doesn't quit out of the program itself. It just hangs in there. I have to do Ctrl-C to quit the program.

Any idea?.

[vlad from moscow]

Could you show what is the result of executing these statemenets?

std::cout << sizeof( unsigned int ) << std::endl;
std::cout << sizeof( std::string::size_type ) << std::endl;

Also it is interesting what compiler are you using?

As for hanging of the program you should show the relevant code.

[smeaglegolum]

Hi,

When I execute the following statements

std::cout << sizeof( unsigned int ) << std::endl;
std::cout << sizeof( std::string::size_type ) << std::endl;

I get

4
8

respectively.

I'm using latest g++ compiler in Ubuntu.

PS: I had no problem with this program in another linux machine with same set up. So, I cannot understand what is the problem in this machine.