使用位升压灵的,你可以使用一个线:
if (tmp_stream >> std::noskipws >>
qi::phrase_match((+qi::double_) % qi::eol, qi::blank, data))
{
和另一条线路上,显示的结果作为奖励:
std::cout << karma::format((karma::double_ % ", ") % karma::eol, data) << "\n";
}
注意它手柄inf
, -inf
,nan
:)
S ee值它Live on Coliru:
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/karma.hpp>
#include <boost/spirit/include/qi_match.hpp>
namespace qi = boost::spirit::qi;
namespace karma = boost::spirit::karma;
int main()
{
std::vector<std::vector<double>> data;
std::stringstream tmp_stream(
"123 45 inf -inf nan .7e-99\n"
"42\n"
"-1");
if (tmp_stream >> std::noskipws >> qi::phrase_match((+qi::double_) % qi::eol, qi::blank, data))
{
std::cout << karma::format((karma::double_ % ", ") % karma::eol, data) << "\n";
}
}
UPDATE稍微适应您输入的语法,我建议解析成对的载体来代替:
#include <boost/fusion/adapted/std_pair.hpp> // handle std::pair
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/karma.hpp>
#include <boost/spirit/include/qi_match.hpp>
namespace qi = boost::spirit::qi;
namespace karma = boost::spirit::karma;
int main()
{
std::vector<std::pair<double, double>> data;
std::stringstream tmp_stream("{ (132.181,0.683431), (136.886,0.988517), (137.316,0.504297), (133.653,0.602269), (150.86,0.236839) }");
if (tmp_stream >> std::noskipws >> qi::phrase_match(
'{'
>>
('(' >> qi::double_ >> "," >> qi::double_ >> ')')
% ','
>> '}',
qi::space, data))
{
std::cout << karma::format(karma::delimit(" ") [karma::auto_] % karma::eol, data) << "\n";
}
}
它打印:(见Live On Coliru
132.181 0.683
136.886 0.989
137.316 0.504
133.653 0.602
150.86 0.237
注意为了使事情更快,考虑不解析形式的流,但使用
streambuf_iterator
- 底层字节的数据,如果你在内存中有它反正
你将有向我们展示您的data_parser代码。 –
为什么不使用std :: pair? –
UldisK
不确定它是否与问题有关,但如果您始终使用双打对,则使用std :: vector>作为存储可能效率更高。 –
icabod