解析错误示例 [英] Example parsing error
问题描述
我正尝试在该示例之后解析一个示例,其中包含增强精神(2.5.2).我的代码如下
I'm trying to parse an example of boost spirit (2.5.2) following the example. My code is the following
#include <boost\spirit\home\qi.hpp>
#include <iostream>
#include <string>
#include <utility>
int main()
{
// Parsing two numbers
std::string input("1.0 2.0");
std::pair<double, double> p;
boost::spirit::qi::phrase_parse(
input.begin(),
input.end(),
boost::spirit::qi::double_ >> boost::spirit::qi::double_ , // Parse grammar
boost::spirit::qi::space,
p
);
return 0;
}
这几乎等于找到的示例此处,但是当我使用Visual Studio 2010(32位,调试)进行编译时,出现以下错误:
It's almost equal to the example found here, but when I compile it with Visual studio 2010 (32 bit, debug) I obtain the following error:
error C2440: 'static_cast': unable to convert from 'const double' to 'std::pair<_Ty1,_Ty2>'
(错误可能略有不同,我已将其翻译为意大利语)
(the error can be slighty different, I've translated it from italian)
我在做错什么,如何成功编译示例?
What I'm doing wrong and how can I compile successfully the example?
预先感谢您的答复.
推荐答案
您缺少一个包含项:
#include <boost/fusion/adapted/std_pair.hpp>
它定义了属性分配规则,以使Fusion序列(vector2<>)可以分配给std :: pair.
It defines the attribute assignment rules to make Fusion sequences (vector2<>) assignable to std::pair.
实时查看代码: liveworkspace.org
See the code live: liveworkspace.org
#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/adapted/std_pair.hpp>
#include <iostream>
#include <string>
#include <utility>
int main()
{
// Parsing two numbers
std::string input("1.2 3.4");
std::pair<double, double> p;
namespace qi = boost::spirit::qi;
qi::phrase_parse(
input.begin(),
input.end(),
qi::double_ >> qi::double_ , // Parse grammar
qi::space, p);
std::cout << "Lo: " << p.first << "\n"
<< "Behold: " << p.second << "\n";
}
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