我正在尝试使用write_graphviz_dp()将包含捆绑属性中rectangle_topology<>::point_type实例的Boost图序列化为DOT文件。
这是一个精简的例子：
#include <iostream>
// Boost 1.49
#include <boost/graph/topology.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/property_map/dynamic_property_map.hpp>
using namespace std;
using namespace boost;
typedef rectangle_topology<> Topology;
typedef Topology::point_type Point;
ostream& operator<<( ostream& out, const Point& pt )
{
return out;
}
istream& operator>>( istream& in, Point& pt )
{
return in;
}
struct Foo
{
float value;
};
ostream& operator<<( ostream& out, const Foo& foo )
{
return out;
}
istream& operator>>( istream& in, Foo& foo )
{
return in;
}
struct VertProps
{
Foo foo;
Point pos;
};
typedef adjacency_list< vecS, vecS, undirectedS, VertProps > Graph;
int main( int argc, char** argv )
{
Graph g;
dynamic_properties dp;
// #1: works
dp.property( "foo", get( &VertProps::foo, g ) );
// #2: dies horrible death in the compiler
// despite seemingly valid operator<< overload
dp.property( "pos", get( &VertProps::pos, g ) );
return 0;
}
为自定义类型（“operator<<”）提供operator>>和Foo重载，编译时没有错误（行#1）。
对Point 执行相同的操作无法正常工作（第#2行）：
c:\boost\include\boost\property_map\dynamic_property_map.hpp(198): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'Point' (or there is no acceptable conversion)
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(695): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(742): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(780): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(827): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(953): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(960): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(967): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(974): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(984): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>,T>(std::basic_ostream<_Elem,_Traits> &&,const _Ty &)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>,
T=Point,
_Ty=Point
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(1101): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(201): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ostream<_Elem,_Traits> &(__cdecl *)(std::basic_ostream<_Elem,_Traits> &))'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(207): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ios<_Elem,_Traits> &(__cdecl *)(std::basic_ios<_Elem,_Traits> &))'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(214): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::ios_base &(__cdecl *)(std::ios_base &))'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(221): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::_Bool)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(241): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(short)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(275): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned short)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(295): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(int)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(320): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned int)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(340): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(360): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned long)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(381): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(__int64)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(401): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned __int64)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(422): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(float)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(442): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(double)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(462): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long double)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(482): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(const void *)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
c:\program files (x86)\microsoft visual studio 11.0\vc\include\ostream(502): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_streambuf<_Elem,_Traits> *)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
while trying to match the argument list '(std::ostringstream, Point)'
c:\boost\include\boost\property_map\dynamic_property_map.hpp(189) : while compiling class template member function 'std::string boost::detail::dynamic_property_map_adaptor<PropertyMap>::get_string(const boost::any &)'
with
[
PropertyMap=boost::bundle_property_map<boost::adjacency_list<boost::vecS,boost::vecS,boost::undirectedS,VertProps>,unsigned int,VertProps,Point>
]
c:\boost\include\boost\property_map\dynamic_property_map.hpp(250) : see reference to class template instantiation 'boost::detail::dynamic_property_map_adaptor<PropertyMap>' being compiled
with
[
PropertyMap=boost::bundle_property_map<boost::adjacency_list<boost::vecS,boost::vecS,boost::undirectedS,VertProps>,unsigned int,VertProps,Point>
]
c:\test\main.cpp(53) : see reference to function template instantiation 'boost::dynamic_properties &boost::dynamic_properties::property<boost::bundle_property_map<Graph,Descriptor,Bundle,T>>(const std::string &,PropertyMap)' being compiled
with
[
Graph=boost::adjacency_list<boost::vecS,boost::vecS,boost::undirectedS,VertProps>,
Descriptor=unsigned int,
Bundle=VertProps,
T=Point,
PropertyMap=boost::bundle_property_map<boost::adjacency_list<boost::vecS,boost::vecS,boost::undirectedS,VertProps>,unsigned int,VertProps,Point>
]
我该如何解决这个问题？是否有更好/不同的方式将Point与dynamic_properties一起使用？