的boost :: circular_buffer <的unique_ptr <T>> :: set_capacity（）沒有建立

我試圖用boost::circular_buffer在我的代碼是這樣的：的boost :: circular_buffer <的unique_ptr <T>> :: set_capacity（）沒有建立

class EventRegistry 
{ 
public: 
    EventRegistry() 
    { 
     pendingEvents_.set_capacity(MAX_PENDING_EVENTS); 
    } 

private: 
    boost::circular_buffer<boost::movelib::unique_ptr<EventData>> pendingEvents_; 
}

但是，我得到一個構建失敗（摘錄）：

... 
boost/build/binaries/include/boost/circular_buffer/details.hpp:470:12: note: in instantiation of function template specialization 'boost::cb_details::uninitialized_move_if_noexcept_impl<boost::cb_details::iterator<boost::circular_buffer<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >, boost::cb_details::nonconst_traits<boost::container::allocator_traits<std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > > > >, boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > *, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >' requested here 
    return uninitialized_move_if_noexcept_impl(first, last, dest, a, tag_t()); 
     ^
boost/build/binaries/include/boost/circular_buffer/base.hpp:955:37: note: in instantiation of function template specialization 'boost::cb_details::uninitialized_move_if_noexcept<boost::cb_details::iterator<boost::circular_buffer<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >, boost::cb_details::nonconst_traits<boost::container::allocator_traits<std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > > > >, boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > *, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >' requested here 
      reset(buff, cb_details::uninitialized_move_if_noexcept(e - (std::min)(new_capacity, size()), 
            ^
events/event_registry.cc:22:18: note: in instantiation of member function 'boost::circular_buffer<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >::rset_capacity' requested here 
    pendingEvents_.rset_capacity(MAX_PENDING_EVENTS); 
...

但是，如果我在構造函數中使用的初始化：

EventRegistry() 
    : pendingEvents_(MAX_PENDING_EVENTS)

然後它編譯好。任何線索？

UPDATE：下面是完整的輸出（遺憾的長度）

boost/build/binaries/include/boost/container/allocator_traits.hpp:408:51: error: no matching constructor for initialization of 'boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >' 
     { ::new((void*)p, boost_container_new_t()) T(::boost::forward<Args>(args)...); } 
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
boost/build/binaries/include/boost/container/allocator_traits.hpp:353:28: note: in instantiation of function template specialization 'boost::container::allocator_traits<std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >::priv_construct<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > >' requested here 
     allocator_traits::priv_construct(flag, a, p, ::boost::forward<Args>(args)...); 
         ^
boost/build/binaries/include/boost/circular_buffer/details.hpp:439:56: note: in instantiation of function template specialization 'boost::container::allocator_traits<std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >::construct<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > >' requested here 
      boost::container::allocator_traits<Alloc>::construct(a, boost::addressof(*dest), *first); 
                ^
boost/build/binaries/include/boost/circular_buffer/details.hpp:460:12: note: in instantiation of function template specialization 'boost::cb_details::uninitialized_copy<boost::cb_details::iterator<boost::circular_buffer<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >, boost::cb_details::nonconst_traits<boost::container::allocator_traits<std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > > > >, boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > *, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >' requested here 
    return uninitialized_copy(first, last, dest, a); 
     ^
boost/build/binaries/include/boost/circular_buffer/details.hpp:470:12: note: in instantiation of function template specialization 'boost::cb_details::uninitialized_move_if_noexcept_impl<boost::cb_details::iterator<boost::circular_buffer<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >, boost::cb_details::nonconst_traits<boost::container::allocator_traits<std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > > > >, boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > *, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >' requested here 
    return uninitialized_move_if_noexcept_impl(first, last, dest, a, tag_t()); 
     ^
boost/build/binaries/include/boost/circular_buffer/base.hpp:880:29: note: in instantiation of function template specialization 'boost::cb_details::uninitialized_move_if_noexcept<boost::cb_details::iterator<boost::circular_buffer<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >, boost::cb_details::nonconst_traits<boost::container::allocator_traits<std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > > > >, boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > *, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >' requested here 
       cb_details::uninitialized_move_if_noexcept(b, b + (std::min)(new_capacity, size()), buff, m_alloc), 
          ^
.../events/event_registry.cc:22:18: note: in instantiation of member function 'boost::circular_buffer<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, std::allocator<boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> > > >::set_capacity' requested here 
    pendingEvents_.set_capacity(MAX_EVENTS_PER_TIMEWINDOW); 
       ^
boost/build/binaries/include/boost/move/unique_ptr.hpp:360:35: note: candidate constructor not viable: 1st argument ('const boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >') would lose const qualifier 
    BOOST_MOVABLE_BUT_NOT_COPYABLE(unique_ptr) 
           ^
boost/build/binaries/include/boost/move/core.hpp:242:46: note: expanded from macro 'BOOST_MOVABLE_BUT_NOT_COPYABLE' 
     BOOST_MOVE_IMPL_NO_COPY_CTOR_OR_ASSIGN(TYPE)\ 
              ^
boost/build/binaries/include/boost/move/core.hpp:35:7: note: expanded from macro 'BOOST_MOVE_IMPL_NO_COPY_CTOR_OR_ASSIGN' 
     TYPE(TYPE &);\ 
    ^
boost/build/binaries/include/boost/move/unique_ptr.hpp:401:20: note: candidate constructor not viable: no known conversion from 'const boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >' to 'bmupd::nullptr_type' (aka 'int (boost::move_upd::bool_conversion::*)()') for 1st argument 
    BOOST_CONSTEXPR unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type)) BOOST_NOEXCEPT 
       ^
boost/build/binaries/include/boost/move/unique_ptr.hpp:527:4: note: candidate constructor not viable: no known conversion from 'const boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >' to '::boost::rv<unique_ptr<EventData, default_delete<EventData> > > &' for 1st argument 
    unique_ptr(BOOST_RV_REF(unique_ptr) u) BOOST_NOEXCEPT 
^
boost/build/binaries/include/boost/move/unique_ptr.hpp:424:13: note: candidate template ignored: substitution failure [with Pointer = boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >]: no type named 'type' in 'boost::move_upd::enable_up_ptr<appd::agent::EventData, boost::movelib::unique_ptr<appd::agent::EventData, boost::movelib::default_delete<appd::agent::EventData> >, appd::agent::EventData *, boost::move_upmu::nat>' 
    explicit unique_ptr(Pointer p 
      ^
boost/build/binaries/include/boost/move/unique_ptr.hpp:462:4: note: candidate constructor template not viable: requires at least 2 arguments, but 1 was provided 
    unique_ptr(Pointer p, BOOST_MOVE_SEEDOC(deleter_arg_type1) d1 
^
boost/build/binaries/include/boost/move/unique_ptr.hpp:500:4: note: candidate constructor template not viable: requires at least 2 arguments, but 1 was provided 
    unique_ptr(Pointer p, BOOST_MOVE_SEEDOC(deleter_arg_type2) d2 
^
boost/build/binaries/include/boost/move/unique_ptr.hpp:547:4: note: candidate template ignored: instantiation would take its own class type by value 
    unique_ptr(BOOST_RV_REF_BEG_IF_CXX11 unique_ptr<U, E> BOOST_RV_REF_END_IF_CXX11 u 
^
boost/build/binaries/include/boost/move/unique_ptr.hpp:390:20: note: candidate constructor not viable: requires 0 arguments, but 1 was provided 
    BOOST_CONSTEXPR unique_ptr() BOOST_NOEXCEPT 
       ^
boost/build/binaries/include/boost/move/unique_ptr.hpp:475:4: note: candidate constructor not viable: requires 2 arguments, but 1 was provided 
    unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), BOOST_MOVE_SEEDOC(deleter_arg_type1) d1) BOOST_NOEXCEPT 
^
boost/build/binaries/include/boost/move/unique_ptr.hpp:513:4: note: candidate constructor not viable: requires 2 arguments, but 1 was provided 
    unique_ptr(BOOST_MOVE_DOC0PTR(bmupd::nullptr_type), BOOST_MOVE_SEEDOC(deleter_arg_type2) d2) BOOST_NOEXCEPT 
^
1 error generated.

來源

2016-06-10 andrei

您包含的錯誤消息的一部分不包含錯誤，它只包含導致它的實例化鏈的一部分。 – zneak

用完整輸出更新了帖子。 – andrei

這兩者之間的一個明顯區別是，當您在構造函數中設置容量時，'circular_buffer'不需要費心嘗試移動/複製現有元素。這似乎是失敗的部分，但我不明白爲什麼它無法移動'unique_ptr's。你使用的是什麼版本的Boost，因爲[this]（http://coliru.stacked-crooked.com/a/9e316b94d0b34287）編譯。也許你正在使用'boost :: move :: unique_ptr'的移動構造函數未標記爲'noexcept'的舊版本？ – Praetorian

下編譯就好了......

#include <boost/circular_buffer.hpp> 
#include <boost/move/unique_ptr.hpp> 

class EventRegistry 
{ 
public: 
    EventRegistry() 
    { 
     pendingEvents_.set_capacity(10); 
    } 

private: 
    boost::circular_buffer<boost::movelib::unique_ptr<int>> pendingEvents_; 
}; 

int main() 
{ 
    return 0; 
}

請注意，我已經放在一個int，你有EventData。你的問題可能與EventData有關。

（我沒有足夠的積分，評論...）

編輯：哦，檢查什麼樣的構造函數的EventData了！你有一個默認的構造函數嗎？

來源

2016-06-10 22:28:33 ajneu

不，EventData沒有默認構造函數，因爲它需要使用特定值進行初始化。我想這就是它失敗的原因。我可以考慮的用於調整循環緩衝區大小的唯一解決方法是創建另一個緩衝區，將原始內容移動到它並刪除原始文件。 – andrei

的boost :: circular_buffer <的unique_ptr <T>> :: set_capacity（）沒有建立

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