C++深度複製一個指針指向具有指針值的映射

Question

深入複製指針指向指針值映射的指針有點麻煩。

std::map<string, TH1D*>* m_hist_split; 

我目前的方法：

我使用的是類模板副本地圖對和初始化一對堆的價值。模板然後返回一個地圖:: type_value

#ifndef DEEPCOPY_H 
#define DEEPCOPY_H 

#include <map> 
#include <algorithm> 

namespace DeepCopy{ 

    template<class A, class B> 
    struct MapPointerValue{ 
     typedef typename std::map< A, B* >::value_type map_t; 
     map_t operator() (map_t p){ 
     return std::make_pair(p.first, new B(*p.second)); 
     } 
    }; 

... 
... 

} 
#endif 

我的拷貝構造函數裏面我再嘗試深拷貝我的指針地圖指針的值。

Cutflow::Cutflow(const Cutflow& cpy){ 

m_hist_split = new map<string, TH1D*>; 
transform(cpy.m_hist_split->begin(),cpy.m_hist_split->end(), inserter(m_hist_split, m_hist_split->begin()), DeepCopy::MapPointerValue<string, TH1D>()); 

... 
... 

} 

當編譯然後我得到一個醜陋的錯誤:-(：

Compiling src/Cutflow.cxx to obj/Cutflow.o 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_iterator.h: In instantiation of 'std::insert_iterator<std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*>': 
src/Cutflow.cxx:42: instantiated from here 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_iterator.h:562: error: 'std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*' is not a class, struct, or union type 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_iterator.h:572: error: 'std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*' is not a class, struct, or union type 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_iterator.h:599: error: 'std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*' is not a class, struct, or union type 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_iterator.h:608: error: 'std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*' is not a class, struct, or union type 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_iterator.h: In function 'std::insert_iterator<_Container> std::inserter(_Container&, _Iterator) [with _Container = std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*, _Iterator = std::_Rb_tree_iterator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> >]': 
src/Cutflow.cxx:42: instantiated from here 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_iterator.h:648: error: 'std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*' is not a class, struct, or union type 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_algo.h: In function '_OIter std::transform(_IIter, _IIter, _OIter, _UnaryOperation) [with _IIter = std::_Rb_tree_iterator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> >, _OIter = std::insert_iterator<std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*>, _UnaryOperation = DeepCopy::MapPointerValue<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D>]': 
src/Cutflow.cxx:42: instantiated from here 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_algo.h:4281: error: no match for 'operator=' in '__result.std::insert_iterator<_Container>::operator* [with _Container = std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*]() = DeepCopy::MapPointerValue<A, B>::operator()(typename std::map<A, B*, std::less<_Key>, std::allocator<std::pair<const A, B*> > >::value_type) [with A = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, B = TH1D](std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*>(((const std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*>&)((const std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*>*)__first.std::_Rb_tree_iterator<_Tp>::operator* [with _Tp = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*>]()))))' 
x86_64-slc5-gcc34-opt/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.3.2/../../../../include/c++/4.3.2/bits/stl_iterator.h:559: note: candidates are: std::insert_iterator<std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*>& std::insert_iterator<std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*>::operator=(const std::insert_iterator<std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TH1D*> > >*>&) 

任何想法，我做錯了

此外，

是我在做什麼正確的？

:-D

Answer 1

在下面的行

transform(cpy.m_hist_split->begin(),cpy.m_hist_split->end(), inserter(m_hist_split, m_hist_split->begin()), DeepCopy::MapPointerValue<string, TH1D>()); 

你已經錯誤地稱爲inserter函數與一個指向map作爲第一個參數，而不是一個參考。

爲了完整起見，inserter在§24.5.2.6.5定義是這樣的：

template <class Container> 
    insert_iterator<Container> inserter(Container& x, typename Container::iterator i); 

返回： insert_iterator（X，I）

在這種情況下，一個簡單的錯字引起了很大的頭痛。