STL向量和具有自定义删除器类的唯一\u ptr 我有一些C++代码，用CLAN 3.2-7和GCC 4.8-1编译，但不是用GCC 4.63.我正在使用c++0x进行编译

我正在实现一个“资源池”，它管理一组固定的资源。它通过提供具有自定义删除器类的唯一_ptr来分配资源；当请求资源的对象退出范围时，删除程序将资源返回到池中

deleter类如下所示：

template <typename T>
class ResourcePoolManager {
public:
    ResourcePoolManager(ResourcePool<T> & pool)
    : pool(pool)
    {
    }

    ~ResourcePoolManager() {};

    void operator()(T* releasedResource) const {
        pool.releaseResource(releasedResource);
    }
private:
    ResourcePool<T> & pool;
};

正如上面提到的，clang和一个更新的版本是gcc，可以使用它。然而，gcc 4.6.3给出了：

/usr/include/c++/4.6/bits/unique_ptr.h: In member function 'std::unique_ptr<_Tp, _Dp>& std::unique_ptr<_Tp, _Dp>::operator=(std::unique_ptr<_Tp, _Dp>&&) [with _Tp = OpenCLDevice, _Dp = ResourcePoolManager<OpenCLDevice>, std::unique_ptr<_Tp, _Dp> = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >]':
/usr/include/c++/4.6/bits/vector.tcc:319:4:   instantiated from 'void std::vector<_Tp, _Alloc>::_M_insert_aux(std::vector<_Tp, _Alloc>::iterator, _Args&& ...) [with _Args = {std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >}, _Tp = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >, _Alloc = std::allocator<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> > >, std::vector<_Tp, _Alloc>::iterator = __gnu_cxx::__normal_iterator<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >*, std::vector<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> > > >, typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type::pointer = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >*]'
/usr/include/c++/4.6/bits/vector.tcc:102:4:   instantiated from 'void std::vector<_Tp, _Alloc>::emplace_back(_Args&& ...) [with _Args = {std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >}, _Tp = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >, _Alloc = std::allocator<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> > >]'
/usr/include/c++/4.6/bits/stl_vector.h:840:9:   instantiated from 'void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >, _Alloc = std::allocator<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> > >, std::vector<_Tp, _Alloc>::value_type = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >]'
trunk/src/dpa/distinguishers/GenericOpenCLDPA.cpp:109:39:   instantiated from here
/usr/include/c++/4.6/bits/unique_ptr.h:176:2: error: use of deleted function 'ResourcePoolManager<OpenCLDevice>& ResourcePoolManager<OpenCLDevice>::operator=(const ResourcePoolManager<OpenCLDevice>&)'

ResourcePool.hpp:30:7 error: 'ResourcePoolManager<OpenCLDevice> & ResourcePoolManager<OpenCLDevice>::operator=(const ResourcePoolManager<OpenCLDevice>&)' 
is implicitly deleted because the default definition would be ill-formed:
ResourcePool.hpp:30:7: error: non-static reference member 'ResourcePool<OpenCLDevice>& ResourcePoolManager<OpenCLDevice>::pool', can't use default assignment operator

/usr/include/c++/4.6/bits/unique\u ptr.h:在成员函数“std:：unique\u ptr&std:：unique\u ptr:：operator=（std:：unique\u ptr&）[with the  \u Tp=OpenCLDevice，_Dp=ResourcePoolManager，std:：unique\u ptr=std:：unique\u ptr&]：
/usr/include/c++/4.6/bits/vector.tcc:319:4：从“void std:：vector:：_M_insert_aux（std:：vector:：iterator，_Args&&…[带_Args={std:：unique_ptr}，_Tp=std:：unique_ptr，_Alloc=std:：Alloc:：分配器，std:：vector:：iterator=u gnu cxx:：：u normal iterator，tyname std:u vector:u-vector基：：u-type=Alloc:：unique:]
/usr/include/c++/4.6/bits/vector.tcc:102:4：从“void std:：vector:：emplace_back”（_Args&&…[带_Args={std:：unique_ptr}，_Tp=std:：unique_ptr，_Alloc=std:：allocator]）实例化
/usr/include/c++/4.6/bits/stl_vector.h:840:9：从“void std:：vector:：push_back（std:：vector:：value_type&&）[with the _Tp=std:：unique_ptr，_Alloc=std:：分配器，std:：vector:：value_type=std:：unique_ptr]实例化
trunk/src/dpa/discrimiters/genericopensldpa.cpp:109:39：从此处实例化
/usr/include/c++/4.6/bits/unique\u ptr.h:176:2:错误：使用已删除的函数“ResourcePoolManager&ResourcePoolManager:：operator=（const ResourcePoolManager&）”
ResourcePool.hpp:30:7错误：“ResourcePoolManager和ResourcePoolManager:：operator=（const ResourcePoolManager&）”
被隐式删除，因为默认定义的格式不正确：
ResourcePool.hpp:30:7:错误：非静态引用成员“ResourcePool&ResourcePoolManager:：pool”，无法使用默认分配运算符

编译器在指针移动到

gpu

向量的最后一行停止，这向我表明某些内容在不应该被复制的情况下被复制。第30行是ResourcePoolManager类

类ResourcePoolManager{

的定义

---

我对自定义删除程序的管理有什么不正确的地方吗？更新的编译器让我可以逍遥法外。

看起来像libstdc++4.6

unique\u ptr中的一个bug，它希望删除程序类型是可复制的

更具体地说，此程序会复制错误：

#include <memory>
#include <vector>

struct deleter {
    deleter() : c(*"") {}
    void operator () (int *) const {}
    deleter(deleter&&) = default;
    deleter& operator = (deleter&&) = default;
    const char& c;
};

int main() {
    std::vector<std::unique_ptr<int, deleter>> vec;
    vec.push_back(std::unique_ptr<int, deleter>{});
}

被指定为只要求
T
是
MoveInsertable
，因此我相信这肯定是libstdc++4.6中的一个错误。
您能标记第30行吗？当然——这是“类资源池管理器{”错误消息还有其他内容吗？编译器想复制删除器对象。这是不可能的，因为成员
ResourcePool&pool；
。我不确定编译器是否需要复制删除器，但似乎可以解决。我猜它想复制这样的行…
return std:：unique\u ptr（资源，管理器）；
您可以使用
std:：unique_ptr（NULL，manager）；
（即使用删除器类型的引用）看起来像libstdc++4.6
unique_ptr中的一个bug，它期望删除器类型是可复制的。
/usr/include/c++/4.6/bits/unique_ptr.h: In member function 'std::unique_ptr<_Tp, _Dp>& std::unique_ptr<_Tp, _Dp>::operator=(std::unique_ptr<_Tp, _Dp>&&) [with _Tp = OpenCLDevice, _Dp = ResourcePoolManager<OpenCLDevice>, std::unique_ptr<_Tp, _Dp> = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >]':
/usr/include/c++/4.6/bits/vector.tcc:319:4:   instantiated from 'void std::vector<_Tp, _Alloc>::_M_insert_aux(std::vector<_Tp, _Alloc>::iterator, _Args&& ...) [with _Args = {std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >}, _Tp = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >, _Alloc = std::allocator<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> > >, std::vector<_Tp, _Alloc>::iterator = __gnu_cxx::__normal_iterator<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >*, std::vector<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> > > >, typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type::pointer = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >*]'
/usr/include/c++/4.6/bits/vector.tcc:102:4:   instantiated from 'void std::vector<_Tp, _Alloc>::emplace_back(_Args&& ...) [with _Args = {std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >}, _Tp = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >, _Alloc = std::allocator<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> > >]'
/usr/include/c++/4.6/bits/stl_vector.h:840:9:   instantiated from 'void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >, _Alloc = std::allocator<std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> > >, std::vector<_Tp, _Alloc>::value_type = std::unique_ptr<OpenCLDevice, ResourcePoolManager<OpenCLDevice> >]'
trunk/src/dpa/distinguishers/GenericOpenCLDPA.cpp:109:39:   instantiated from here
/usr/include/c++/4.6/bits/unique_ptr.h:176:2: error: use of deleted function 'ResourcePoolManager<OpenCLDevice>& ResourcePoolManager<OpenCLDevice>::operator=(const ResourcePoolManager<OpenCLDevice>&)'

ResourcePool.hpp:30:7 error: 'ResourcePoolManager<OpenCLDevice> & ResourcePoolManager<OpenCLDevice>::operator=(const ResourcePoolManager<OpenCLDevice>&)' 
is implicitly deleted because the default definition would be ill-formed:
ResourcePool.hpp:30:7: error: non-static reference member 'ResourcePool<OpenCLDevice>& ResourcePoolManager<OpenCLDevice>::pool', can't use default assignment operator

#include <memory>
#include <vector>

struct deleter {
    deleter() : c(*"") {}
    void operator () (int *) const {}
    deleter(deleter&&) = default;
    deleter& operator = (deleter&&) = default;
    const char& c;
};

int main() {
    std::vector<std::unique_ptr<int, deleter>> vec;
    vec.push_back(std::unique_ptr<int, deleter>{});
}

int main() {
    std::vector<std::unique_ptr<int, deleter>> vec;
    vec.push_back(std::unique_ptr<int, deleter>{new int(42)});
    vec[0] = std::unique_ptr<int, deleter>{new int(42)};
}