提升的向量
我试图使用boost :: variant
std::vector<boost::variant<mesh::Entity&, mesh::Vertex, mesh::Edge> >
xField::getZeros(const mesh::Region& s, char *EntityS) const
{
//Vertex
if( EntityS == "V" )
{
std::vector<mesh::Vertex> zeros;
for(Region::vertexIterator itv = s.beginVertex();
itv != s.endVertex(); ++itv )
{
if( abs(getVal(*itv)) < 1.e-12 )
zeros.push_back(*itv);
}
return zeros;
}
else if ..
但我收到错误：错误：从'std :: vector'转换为非标量类型'std :: vector>'请求
编辑：
zeroVector xField::getZeros(const mesh::Region& s, char *EntityS) const
{
//Vertex
if( EntityS == "V" )
{
zeroVector zeros;
for(Region::vertexIterator itv = s.beginVertex(); itv != s.endVertex(); ++itv )
{
if( abs(getVal(*itv)) < 1.e-12 )
zeros.push_back( zeroVariant(*itv) );
}
return zeros;
我在.h文件中定义了typedef
typedef boost::variant<mesh::Entity&, mesh::Vertex, mesh::Edge> zeroVariant;
typedef std::vector<zeroVariant> zeroVector;
现在我有以下错误：
/softs/boost/1.53.0/64/gcc/4.5.1/include/boost/detail/reference_content.hpp：在成员函数'void boost :: detail :: variant :: assign_storage :: internal_visit（T＆，int） const [with T = boost :: detail :: reference_content]'：/softs/boost/1.53.0/64/gcc/4.5.1/include/boost/variant/detail/visitation_impl.hpp:130:9：实例化自'typename Visitor :: result_type boost :: detail :: variant :: visitation_impl_invoke_impl（int，Visitor＆，VoidPtrCV，T *，mpl _ :: true_）[with Visitor = boost :: detail :: variant :: assign_storage，VoidPtrCV = void * ，T = boost :: detail :: reference_content，typename Visitor :: result_type = void，mpl _ :: true_ = mpl _ :: bool_]'/softs/boost/1.53.0/64/gcc/4.5.1/include/boost /variant/detail/visitation_impl.hpp:173:9：从'typename Visitor :: result_type boost :: detail :: variant :: visitation_impl_invoke（int，Visitor＆，VoidPtrCV，T *，NoBackupFlag，int）实例化[with Visitor = boost :: detail :: variant :: assign_storage，VoidPtrCV = void *，T = boost :: detail :: reference_content，NoBackupFlag = boost :: v ariant :: has_fallback_type_，typename Visitor :: result_type = void]'/softs/boost/1.53.0/64/gcc/4.5.1/include/boost/variant/detail/visitation_impl.hpp:260:1：从' typename Visitor :: result_type boost :: detail :: variant :: visitation_impl（int，int，Visitor＆，VoidPtrCV，mpl _ :: false_，NoBackupFlag，其中*，step0 *）[其中= mpl _ :: int_ <0>，step0 = boost :: detail :: variant :: visitation_impl_step，boost :: detail :: reference_content，boost :: mpl :: l_item，mesh :: Vertex，boost :: mpl :: l_item，mesh :: Edge，boost :: mpl :: l_end>>>>，boost :: mpl :: l_iter>，Visitor = boost :: detail :: variant :: assign_storage，VoidPtrCV = void *，NoBackupFlag = boost :: variant :: has_fallback_type_，typename Visitor :: result_type = void，mpl _ :: false_ = mpl _ :: bool_]'/softs/boost/1.53.0/64/gcc/4.5.1/include/boost/variant/variant.hpp:2326:13：从静态类型名实例化Visitor :: result_type boost :: variant :: internal_apply_visitor_impl（int，int，Visitor＆，VoidPtrCV）[Visitor = boost :: detail :: variant :: assign_storage， VoidPtrCV = void *，T0_ = mesh :: Entity＆，T1 = mesh :: Vertex，T2 = mesh :: Edge，T3 = boost :: detail :: variant :: void_，T4 = boost :: detail :: variant :: void_，T5 = boost :: detail :: variant :: void_，T6 = boost :: detail :: variant :: void_，T7 = boost :: detail :: variant :: void_，T8 = boost :: detail :: variant :: void_，T9 = boost :: detail :: variant :: void_，T10 = boost :: detail :: variant :: void_，T11 = boost :: detail :: variant :: void_，T12 = boost :: detail： ：variant :: void_，T13 = boost :: detail :: variant :: void_，T14 = boost :: detail :: variant :: void_，T15 = boost :: detail :: variant :: void_，T16 = boost :: detail :: variant :: void_，T17 = boost :: detail :: variant :: void_，T18 = boost :: detail :: variant :: void_，T19 = boost :: detail :: variant :: void_，typename Visitor： ：result_type = void]'/softs/boost/1.53.0/64/gcc/4.5.1/include/boost/variant/variant.hpp:2337:13：从'typename Visitor :: result_type boost :: variant： ：internal_apply_visitor（Visitor＆）[带访问者= boost :: detail :: variant :: assign_storage，T0_ = mesh :: Entity＆，T1 = mesh :: 顶点，T2 = mesh :: Edge，T3 = boost :: detail :: variant :: void_，T4 = boost :: detail :: variant :: void_，T5 = boost :: detail :: variant :: void_，T6 = boost :: detail :: variant :: void_，T7 = boost :: detail :: variant :: void_，T8 = boost :: detail :: variant :: void_，T9 = boost :: detail :: variant :: void_， T10 = boost :: detail :: variant :: void_，T11 = boost :: detail :: variant :: void_，T12 = boost :: detail :: variant :: void_，T13 = boost :: detail :: variant :: void_，T14 = boost :: detail :: variant :: void_，T15 = boost :: detail :: variant :: void_，T16 = boost :: detail :: variant :: void_，T17 = boost :: detail :: variant :: void_，T18 = boost :: detail :: variant :: void_，T19 = boost :: detail :: variant :: void_，typename Visitor :: result_type = void]'/softs/boost/1.53.0/64/ gcc / 4.5.1 / include / boost / variant / variant.hpp：2085：13：从'void boost :: variant :: variant_assign（const boost :: variant＆）'实例化[with T0_ = mesh :: Entity＆，T1 = mesh :: Vertex，T2 = mesh :: Edge，T3 = boost :: detail :: variant :: void_，T4 = boost :: detail :: variant :: void_，T5 = boost :: detail :: varia nt :: void_，T6 = boost :: detail :: variant :: void_，T7 = boost :: detail :: variant :: void_，T8 = boost :: detail :: variant :: void_，T9 = boost :: detail :: variant :: void_，T10 = boost :: detail :: variant :: void_，T11 = boost :: detail :: variant :: void_，T12 = boost :: detail :: variant :: void_，T13 = boost： ：detail :: variant :: void_，T14 = boost :: detail :: variant :: void_，T15 = boost :: detail :: variant :: void_，T16 = boost :: detail :: variant :: void_，T17 = boost :: detail :: variant :: void_，T18 = boost :: detail :: variant :: void_，T19 = boost :: detail :: variant :: void_，boost :: variant = boost :: variant]'/ softs /boost/1.53.0/64/gcc/4.5.1/include/boost/variant/variant.hpp:2175:9：从'boost :: variant＆boost :: variant :: operator =（const boost :: variant＆ ）[with T0_ = mesh :: Entity＆，T1 = mesh :: Vertex，T2 = mesh :: Edge，T3 = boost :: detail :: variant :: void_，T4 = boost :: detail :: variant :: void_， T5 = boost :: detail :: variant :: void_，T6 = boost :: detail :: variant :: void_，T7 = boost :: detail :: variant :: void_，T8 = boost :: detail :: variant :: void_，T9 = boost :: detail :: variant :: void_，T10 = boost :: detail :: variant :: void_，T11 = boost :: detail :: variant :: void_，T12 = boost :: detail :: variant :: void_ ，T13 = boost :: detail :: variant :: void_，T14 = boost :: detail :: variant :: void_，T15 = boost :: detail :: variant :: void_，T16 = boost :: detail :: variant： ：void_，T17 = boost :: detail :: variant :: void_，T18 = boost :: detail :: variant :: void_，T19 = boost :: detail :: variant :: void_，boost :: variant = boost ::变体]'/usr/include/c++/4.5/bits/vector.tcc:312:4：从'void std :: vector <_Tp，_Alloc> :: _ M_insert_aux（std :: vector <_Tp，_Alloc> :: iterator，const _Tp＆）[with _Tp = boost :: variant，_Alloc = std :: allocator>，std :: vector <_Tp，_Alloc> :: iterator = __gnu_cxx :: __ normal_iterator *，std :: vector >>>，typename std :: _ Vector_base <_Tp，_Alloc> :: _ Tp_alloc_type :: pointer = boost :: variant *]'/usr/include/c++/4.5/bits/stl_vector.h:749:4：从'void std :: vector < _Tp，_Alloc> :: push_back（const value_type＆）[with _Tp = boost :: variant，_Alloc = std :: allocator>，va lue_type = boost :: variant]'/home/mycode.cc:128:42：从这里实例化/softs/boost/1.53.0/64/gcc/4.5.1/include/boost/detail/reference_content.hpp:62 ：24：error：'boost :: detail :: reference_content＆boost :: detail :: reference_content :: operator =（const boost :: detail :: reference_content＆）[with RefT = mesh :: Entity＆，boost :: detail :: reference_content = boost :: detail :: reference_content]'是private /softs/boost/1.53.0/64/gcc/4.5.1/include/boost/variant/variant.hpp:526:9：error：within this context
提前致谢！！！！！
你需要改变'零'的类型 - 它不能从std::vector<mesh::Vertex>转换为你的变体类型的向量。 使用一些typedefs来减少代码冗长：
typedef boost::variant<mesh::Entity&, mesh::Vertex, mesh::Edge> EvVariant;
typedef std::vector<EvVariant> EvVariantVector;
EvVariantVector xField::getZeros(const mesh::Region& s, char *EntityS) const
{
//Vertex
if( EntityS == "V" ) // This line is probably a bug!
{
EvVariantVector zeros; // Use the return type here!
for(Region::vertexIterator itv = s.beginVertex(); itv != s.endVertex(); ++itv )
{
if( abs(getVal(*itv)) < 1.e-12 )
zeros.push_back(EvVariant(*itv));
}
return zeros;
}
else if ..
另外，行if (EntityS == "V")不正确，可能会失败。 使用strcmp或只比较字符串的第一个字符。
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