I have a template class that needs to parse a string into the user-defined type.
void parse(const std::string& value)
{
_Template_defined_type data;
std::stringstream stream_value(value, std::stringstream::in);
stream_value >> data;
}
This works like a charm for everything except, ironically, strings. Strings end at the first space instead of the end of the passed string.
Obviously I can't use getline since the data may not be a strings (it could be an int, float, or user-defined class) so I either need a way to serialize the whole line for strings or a different general-purpose way to parse the data.
Thanks.
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Nope, the string is user-entered. I don't serialize it out at all. And since the template may be based on a primitive type I can't even spec out that the user defined class have certain functions.
I suppose I could create a string-specific version of the template, but trusting whoever uses the template to use it right may be a bit over-hopeful. Templates don't seem to offer any way to switch on the type they use, do they?
Hmm, so better yet would be to rewrite the parse function as
void MyTemplate<_Tdt>::parse(co
{
_Tdt data;
parse(data, value);
// Do what I need to do.
}
template<class T>
void parse<T& data, const std::string& value)
{
std::stringstream stream_value(value, std::stringstream::in);
stream_value >> data;
}
Then allow the user to override the template function as desired!
void parse(std::string& data, const std::string& value)
{
std::stringstream stream_value(value, std::stringstream::in);
getline(stream_value, data);
}
Okay, I officially feel stupid for not thinking of function templates.
Okay, the function tamplates with specialized string handling works like a charm. I didn't expect it not to, I just was worried some issue would crop up.
Better yet, I can use this in a few other places where an issue hasn't cropped up, but could.
I'm giddy as a schoolgirl, which is not in the least dignified, I might add.
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by: jkrPosted on 2008-02-07 at 10:05:21ID: 20843189
What about escaping the spaces upon saving (or replacing them with e.g. an underscore)? .... just playing with ideas...