1

我不知道该怎么做；它快把我逼疯了。

#include <iostream>
#include <memory>
#include <map>

int main()
{
    std::map<std::string, std::unique_ptr<std::string>> map;
    std::unique_ptr<std::string> bar(new std::string("bar"));
    map["foo"] = std::move(bar);

    std::cout << "foo: " << *(map["foo"]) << std::endl;
}

这在 gcc v4.9.2 上编译得很好：

$ g++ -std=c++0x test.cc -o test

不幸的是，我可以使用的只有 gcc v4.4.7，它会产生一个可怕的错误消息，我将把它贴在底部。

我可以push_back unique_ptr进入vectors 就好了；我不明白为什么有问题map。

我也尝试过使用insert：

int main()
{
    std::map<std::string, std::unique_ptr<std::string>> map;
    std::unique_ptr<std::string> bar(new std::string("bar"));
    auto pair = std::make_pair("foo", std::move(bar));
    map.insert(std::move(pair));

    std::cout << "foo: " << *(map["foo"]) << std::endl;
}

我可以做得pair很好，但是当我尝试move进入时，insert我得到了错误。它似乎出于某种原因试图调用复制构造函数，但我不明白为什么，因为我正在调用move它。

emplace有相同的结果：

int main()
{
    std::map<std::string, std::unique_ptr<std::string>> map;
    std::unique_ptr<std::string> bar(new std::string("bar"));
    auto pair = std::make_pair("foo", std::move(bar));
    map.emplace(std::move(pair));

    std::cout << "foo: " << *(map["foo"]) << std::endl;
}

这两个都在 g++ v4.9.2 中编译得很好，但在 v4.4.7 中没有。

任何人都对另一种方法有任何想法（在 v4.4.7 中）？

完整的错误消息输出（来自第一个示例）：

In file included from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_algobase.h:66,
                 from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/char_traits.h:41, 
                 from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ios:41,                
                 from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ostream:40,            
                 from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iostream:40,           
                 from test.cc:1:
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/unique_ptr.h: In copy constructor 'std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::pair(const std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&)':
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_pair.h:68:   instantiated from 'std::_Rb_tree_node<_Val>::_Rb_tree_node(_Args&& ...) [with _Args = const std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, _Val = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >]'
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/ext/new_allocator.h:111:   instantiated from 'void __gnu_cxx::new_allocator<_Tp>::construct(_Tp*, _Args&& ...) [with _Args = const std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, _Tp = std::_Rb_tree_node<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >]'
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h:394:   instantiated from 'std::_Rb_tree_node<_Val>* std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_create_node(_Args&& ...) [with _Args = const std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Val = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, _KeyOfValue = std::_Select1st<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >]'
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h:881:   instantiated from 'std::_Rb_tree_iterator<_Val> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_(const std::_Rb_tree_node_base*, const std::_Rb_tree_node_base*, const _Val&) [with _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Val = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, _KeyOfValue = std::_Select1st<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >]'
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h:1215:   instantiated from 'std::_Rb_tree_iterator<_Val> std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::_M_insert_unique_(std::_Rb_tree_const_iterator<_Val>, const _Val&) [with _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Val = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, _KeyOfValue = std::_Select1st<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >]'
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_map.h:540:   instantiated from 'typename std::_Rb_tree<_Key, std::pair<const _Key, _Tp>, std::_Select1st<std::pair<const _Key, _Tp> >, _Compare, typename _Alloc::rebind<std::pair<const _Key, _Tp> >::other>::iterator std::map<_Key, _Tp, _Compare, _Alloc>::insert(typename std::_Rb_tree<_Key, std::pair<const _Key, _Tp>, std::_Select1st<std::pair<const _Key, _Tp> >, _Compare, typename _Alloc::rebind<std::pair<const _Key, _Tp> >::other>::iterator, const std::pair<const _Key, _Tp>&) [with _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Tp = std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >]'
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_map.h:450:   instantiated from '_Tp& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const _Key&) [with _Key = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Tp = std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, _Compare = std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, _Alloc = std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >]'
test.cc:9:   instantiated from here
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/unique_ptr.h:214: error: deleted function 'std::unique_ptr<_Tp, _Tp_Deleter>::unique_ptr(const std::unique_ptr<_Tp, _Tp_Deleter>&) [with _Tp = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Tp_Deleter = std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >]'
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_pair.h:68: error: used here
In file included from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/map:60,
                 from test.cc:3:
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h: In constructor 'std::_Rb_tree_node<_Val>::_Rb_tree_node(_Args&& ...) [with _Args = const std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&, _Val = std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >]':
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h:136: note: synthesized method 'std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::pair(const std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::default_delete<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&)' first required here
4

2 回答 2

4

GCC 4.4.7 不提供对 C++ 11 功能的完全支持，因此期望所有 C++ 11 功能都能正常工作是不现实的。在这种特殊情况下，编译器不会为您生成移动分配和移动复制方法。因此，当std::map尝试分配或复制时，它会使用常规的默认值，这些默认值在unique_ptr.

如果你只需要一个智能指针，你可以shared_ptr改用。

std::map<std::string, std::shared_ptr<std::string>> map;
std::shared_ptr<std::string> bar = std::make_shared<std::string>("bar");
map["foo"] = bar;
于 2015-12-31T16:54:50.273 回答
1

我已经调查了这个问题。map 的 STL 实现正确地定义了一个移动构造函数：

#ifdef __GXX_EXPERIMENTAL_CXX0X__
      template<typename... _Args>
        _Rb_tree_node(_Args&&... __args)
    : _Rb_tree_node_base(),
      _M_value_field(std::forward<_Args>(__args)...) { }
#endif
    };

此外，如错误输出中所述，这被调用。std::pair也定义了移动构造函数，但是没有调用这个构造函数。

我相信，std::forward并且推断的 Args 类型是错误的：

usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h：在构造函数'std::_Rb_tree_node< _Val>::_Rb_tree_node(_Args&& ...) [with _Args = const std::pair<..., std::unique_ptr<...> >&,

如您所见，_Args 的类型是一个 const 引用，由 forward 转发，并调用常规 pair 构造函数。

我假设，有人可能会摆弄 stl_tree.h 来修复它 - 例如，通过删除 std::forward 并将 arg 转换为右值引用。当然，这是不正确的，但可能适用于特定情况。

于 2015-12-31T17:01:46.253 回答