Field Validation

If you're using std::string:



[edit]Simplified check[/edit]

struct notNumber{  //Functor to check if a character isn't a digit.  struct notDigit  {    operator()(char const &c)    {         return c < '0' || c > '9';    }  };  //Return true if field is not a number.  bool operator()(string const &field)  {     return find_if(field.begin(), field.end(), notDigit()) != field.end();  }};

The above notNumber functor will check if a std::string meets contains any character other than [0-9].

Quote:

Original post by gisdev If you're using std::string: *** Source Snippet Removed *** [edit]Simplified check[/edit]

I like that better.

it doesn't work with -5 or 3.142 or 1e-7

If you want to deal with those properly you'll need to look into locales. For example some countries would have 3,142 instead of 3.142.

Personally I would use boost.lexical_cast and let it worry about whether the conversion is correct.