矢量的助推变体

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

EDIT:

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）中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[与Visitor = boost :: detail :: variant :: assign_storage，VoidPtrCV = void *，T = boost :: detail :: reference_content，NoBackupFlag = boost :: variant :: 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 ：实例化'typename Visitor :: result_type boost :: detail :: variant :: visitation_impl（int，int，Visitor＆，VoidPtrCV，mpl _ :: false_，NoBackupFlag，which *，step0 *）[with Which = 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：instantiated来自'static typename Visitor :: result_type boost :: variant :: internal_apply_visitor_impl（int，int，Visitor＆，VoidPtrCV）[with Visitor = boost :: detail :: varian t :: 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实例化boost :: variant :: internal_apply_visitor（Visitor＆）[与Visitor = boost :: detail :: variant :: assign_storage，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:2085:13：从'void boost :: variant :: variant_assign（const boost :: variant＆）实例化[含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 :: variant]'/softs/boost/1.53.0/64/gcc/4.5.1/include/boost/variant/variant.hpp:2175:9：从'boost :: variant＆boost :: variant ::实例化运算符=（const的boost :: variant＆）[与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 :: variant]'/ usr / include / c /4.5/bits/vector.tcc:312:4：从'void std :: vector <_Tp，_Alloc> :: _ M_insert_aux（std :: vector）实例化<_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＆）[与_Tp = boost :: variant，_Alloc = std :: allocator>，value_type = boost :: variant]'/ home实例化/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：错误：'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]'是私人/softs/boost/1.53.0/64/gcc/4.5.1/include/boost/variant/variant.hpp:526:9：错误：在此上下文中

提前致谢！！！！！