I would like to split a string along whitespaces, and I know that the tokens represent valid integers. I would like to transform the tokens into integers and populate a vector with them.
I could use boost::split, make a vector of token strings, then use std::transform.
What is your solution? Using boost is acceptable.
Something like this:
std::istringstream iss("42 4711 ");
std::vector<int> results( std::istream_iterator<int>(iss)
, std::istream_iterator<int>() );
?
You can use Boost.Tokenizer . It can easily be wrapped up into an explode_string
function that takes a string and the delimiter and returns a vector of tokens.
Using transform
on the returned vector is a good idea for the transformation from strings to ints; you can also just pass the Boost.Tokenizer iterator into the transform
algorithm.
Use Boost's string algorithm library to split
the string into a vector of strings, then std::for_each
and either atoi
or boost::lexical_cast
to turn them into int
s. It's likely to be far simpler than other methods, but may not have the greatest performance due to the copy (if someone has a way to improve it and remove that, please comment).
std::vector<int> numbers;
void append(std::string part)
{
numbers.push_back(boost::lexical_cast<int>(part));
}
std::string line = "42 4711"; // borrowed from sbi's answer
std::vector<std::string> parts;
split(parts, line, is_any_of(" ,;"));
std::for_each(parts.being(), parts.end(), append);
Roughly.
http://www.boost.org/doc/libs/1_44_0/doc/html/string_algo.html http://www.boost.org/doc/libs/1_44_0/libs/conversion/lexical_cast.htm
你总是可以使用strtok或string.find()。
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