CODEWITHSUNDEEP
c++
StudentX
StudentX

Reputation: 2323

std::string related errors and handling them, c++

Alright, it might be a stupid question, but I will go ahead and ask anyway.

So, I was wondering, what are all the possible errors associated with std::string usage ? I know a few, for example accessing char at location greater then the std::string size in various std::string functions.

While programming what errors should I keep in mind and place checks on ?

And is there an another way to do following for example, efficiently ?

std::string s("some string.");

int i = s.find ( "." );


if (  i != std::string::npos    &&  i + 3 < s.length (  )  ) // <<== this check is what I am talking about
    s.erase ( i + 3 );

I have a program, which requires hundreds of such checks, so I was wondering, there was an another way then to do if( some_condition ) each time.

Upvotes: 0

Views: 122

Answers (2)

P0W
P0W

Reputation: 47794

If i greater than the string length, an out_of_range exception is thrown

Ref:- std::string::erase

So you can always catch it !

std::string s("some string.");
int i = s.find ( "." );

if (i != std::string::npos)
try 
{
   s.erase ( i + 3 );
}
catch (const std::out_of_range& err) 
{
  std::cerr << "Out of Range error: " << err.what() << std::endl;
}

Upvotes: 0

Lightness Races in Orbit
Lightness Races in Orbit

Reputation: 385144

You don't need to list every error case for the whole class; just look up the documentation for the functions that you use, which typically lists preconditions.

For example, cppreference.com's page on std::string::erase.

Upvotes: 2

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