如何将向量中插入队列元素？ [英] How do I insert queue elements into a vector?
问题描述
我有
typedef std :: queue< MyObject *> InputQueue;
std :: vector< InputQueue> inp_queue;
现在我想做的是在运行时定义5个队列并将数据放在这些队列上，例如
inp_queue [1] .push（new MyObject
等。
编译，但它的核心转储立即。我想我需要实际添加队列到向量首先（他们不会像地图一样自动创建）。如何添加队列，而不是指向队列的指针？
编辑：
已经指出，我使用的队列类不是std :: queue，但是这一个： http://www.justsoftwaresolutions.co.uk/threading/implementing-a-thread-safe-queue-using-condition-variables.html
我没想到编译器会抱怨，否则我会说出来。
我编译应用程序，得到这个编译错误。
g ++ test.cpp
在/ usr / include /c++/4.4/deque:63，
来自/usr/include/c++/4.4/queue:61，
来自concurrentqueue.h：3，
来自test.cpp：1：
/usr/include/c++/4.4/bits/stl_construct.h：在函数'void std :: _Construct（_T1 *，const _T2&）[with _T1 = concurrent_queue< Packet *>，_T2 = concurrent_queue< Packet *>]'：
/usr/include/c++/4.4/bits/stl_uninitialized.h:187：实例化为'static void std :: __ uninitialized_fill_n<< anonymous> > :: uninitialized_fill_n（_ForwardIterator，_Size，const _Tp&）[with _ForwardIterator = concurrent_queue< Packet *> *，_Size = long unsigned int，_Tp = concurrent_queue< Packet *>，bool< anonymous> = false]'
/usr/include/c++/4.4/bits/stl_uninitialized.h:223：实例化为'void std :: uninitialized_fill_n（_ForwardIterator，_Size，const _Tp&）[with _ForwardIterator = concurrent_queue& > *，_Size = long unsigned int，_Tp = concurrent_queue< Packet *>]
/usr/include/c++/4.4/bits/stl_uninitialized.h:318：实例化为'void std :: __ uninitialized_fill_n_a _ForwardIterator，_Size，const _Tp& std :: allocator <_Tp2>&）[with _ForwardIterator = concurrent_queue< Packet *> *，_Size = long unsigned int，_Tp = concurrent_queue< Packet *> _Tp2 = concurrent_queue& *]'
/usr/include/c++/4.4/bits/stl_vector.h:1035：从'void std :: vector< _Tp，_Alloc> :: _ M_fill_initialize（size_t，const _Tp&与_Tp = concurrent_queue< Packet *>，_Alloc = std :: allocator< concurrent_queue< Packet *> >]'
/usr/include/c++/4.4/bits/stl_vector.h:230：从'std :: vector <_Tp，_Alloc> :: vector（size_t，const_Tp& const_Alloc& ）[with _Tp = concurrent_queue< Packet *>，_Alloc = std :: allocator< concurrent_queue< Packet *> >]'
test.cpp：18：从这里实例化
/usr/include/c++/4.4/bits/stl_construct.h:74：错误：没有匹配函数调用'concurrent_queue< Packet *> :: concurrent_queue（const concurrent_queue< Packet *>&）'
concurrentqueue.h：12：note：候选者是：concurrent_queue< Packet *> :: concurrent_queue（）
concurrentqueue。 h：12：note：concurrent_queue< Packet *> :: concurrent_queue（concurrent_queue< Packet *&）
您尚未分配任何5个队列。尝试：
typedef std :: queue< MyObject *>输入队列;
std :: vector< InputQueue> inp_queue（5）;
inp_queue [1] .push（new MyObject（））;
也不是 std :: vector 从0开始的索引，因此插入到第一个队列：
inp_queue [0] .push（new MyObject
编辑的后续：并发队列似乎有一个复制构造函数。这意味着您不能将其放在任何标准容器中，因为它不满足要求。容器的值类型必须是可复制构造的和可复制分配的。
I have
typedef std::queue<MyObject*> InputQueue;
std::vector<InputQueue> inp_queue;
Now what I want to do is define at runtime say 5 queues and place data on those queues like
inp_queue[1].push(new MyObject());
etc.
I got it to compile, but it core dumps right away. I guess I need to actually add the queues to the vector first (they don't get created automatically like a map). How do I add a queue without it being a pointer to a queue?
EDIT:
I should really have pointed out that the queue class I am using is not std::queue but this one: http://www.justsoftwaresolutions.co.uk/threading/implementing-a-thread-safe-queue-using-condition-variables.html
I didn't expect the compiler to complain about it otherwise I would have stated it up front.
Unfortunately when I compile the application I get this compilation error.
g++ test.cpp
In file included from /usr/include/c++/4.4/deque:63,
from /usr/include/c++/4.4/queue:61,
from concurrentqueue.h:3,
from test.cpp:1:
/usr/include/c++/4.4/bits/stl_construct.h: In function ‘void std::_Construct(_T1*, const _T2&) [with _T1 = concurrent_queue<Packet*>, _T2 = concurrent_queue<Packet*>]’:
/usr/include/c++/4.4/bits/stl_uninitialized.h:187: instantiated from ‘static void std::__uninitialized_fill_n<<anonymous> >::uninitialized_fill_n(_ForwardIterator, _Size, const _Tp&) [with _ForwardIterator = concurrent_queue<Packet*>*, _Size = long unsigned int, _Tp = concurrent_queue<Packet*>, bool <anonymous> = false]’
/usr/include/c++/4.4/bits/stl_uninitialized.h:223: instantiated from ‘void std::uninitialized_fill_n(_ForwardIterator, _Size, const _Tp&) [with _ForwardIterator = concurrent_queue<Packet*>*, _Size = long unsigned int, _Tp = concurrent_queue<Packet*>]’
/usr/include/c++/4.4/bits/stl_uninitialized.h:318: instantiated from ‘void std::__uninitialized_fill_n_a(_ForwardIterator, _Size, const _Tp&, std::allocator<_Tp2>&) [with _ForwardIterator = concurrent_queue<Packet*>*, _Size = long unsigned int, _Tp = concurrent_queue<Packet*>, _Tp2 = concurrent_queue<Packet*>]’
/usr/include/c++/4.4/bits/stl_vector.h:1035: instantiated from ‘void std::vector<_Tp, _Alloc>::_M_fill_initialize(size_t, const _Tp&) [with _Tp = concurrent_queue<Packet*>, _Alloc = std::allocator<concurrent_queue<Packet*> >]’
/usr/include/c++/4.4/bits/stl_vector.h:230: instantiated from ‘std::vector<_Tp, _Alloc>::vector(size_t, const _Tp&, const _Alloc&) [with _Tp = concurrent_queue<Packet*>, _Alloc = std::allocator<concurrent_queue<Packet*> >]’
test.cpp:18: instantiated from here
/usr/include/c++/4.4/bits/stl_construct.h:74: error: no matching function for call to ‘concurrent_queue<Packet*>::concurrent_queue(const concurrent_queue<Packet*>&)’
concurrentqueue.h:12: note: candidates are: concurrent_queue<Packet*>::concurrent_queue()
concurrentqueue.h:12: note: concurrent_queue<Packet*>::concurrent_queue(concurrent_queue<Packet*>&)
You have not allocated any of the 5 queues. Try:
typedef std::queue<MyObject*> InputQueue;
std::vector<InputQueue> inp_queue(5);
inp_queue[1].push(new MyObject());
Also not that std::vector uses indices starting from 0, so to insert into the first queue:
inp_queue[0].push(new MyObject());
Follow-up to your edit: The concurrent queue does not seem to have a copy constructor. This means you can not put it in any standard container because it does not satisfy the requirements. The container's value-type must be copy-constructible and copy-assignable.
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