From a Vector of string to an array of ints
Author
I have a tile map with comma delimited tile codes in it.
Ive read the file, broke it down into its correct numbers
i.e 123,44,67 into ->
123
44
67
And stored them in vector i want to take them out of the vector and bung them in an array of ints, but whats the best way to cast them to ints? i tried a stringstream in a for(0 -> vector.size) loop but it seemed to just spit out the first number it converted over and over.
What the best way of going about this?
Try boost::lexical_cast, or make sure that you clear() the flags on the stringstream after every extraction.
Author
Quote:Original post by SiCrane
.... or make sure that you clear() the flags on the stringstream after every extraction.
2 things....
1)Thanks.
&
2)Whoops, whats a silly thing for me to overlook.
Try reading them directly into an vector of ints (and then creating an array from that without any "casting", if you *really* need to make such an array).
Better yet, separate the values in your file with whitespace instead of commas so that you don't have to worry about that part of the parsing.
vector<int> result;int current;char comma;while(file >> current) { result.push_back(current); file >> comma; // optionally check if it actually was a comma.}Better yet, separate the values in your file with whitespace instead of commas so that you don't have to worry about that part of the parsing.
Author
Zahlman, so if i whitespace delimit can I read directly into a an int?
How is this done?
At the moment im doing:
To read into a string(ReadIn) but if i could just read the delimited numbers into an int it would save time and coding.
Cheers.
How is this done?
At the moment im doing:
while ((getline(ReadMap,ReadIn,',')) != NULL) { LevelList.push_back(ReadIn); }To read into a string(ReadIn) but if i could just read the delimited numbers into an int it would save time and coding.
Cheers.
Let's assume you have a file that has nothing but integers in it. You can read it into a vector like so:
This will be equivalent to using operator>> to read in every int. Of course this isn't appropriate if your file has any structure further than just being a list of ints.
std::ifstream ifs("filename");std::istream_iterator begin(ifs);std::istream_iterator end;std::vector<int> int_vector(begin, end);This will be equivalent to using operator>> to read in every int. Of course this isn't appropriate if your file has any structure further than just being a list of ints.
Quote:Original post by JDUK
Zahlman, so if i whitespace delimit can I read directly into a an int?
How is this done?
For a single int, with the usual stream extraction operator:
(stream object) >> (int variable);This topic is closed to new replies.
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