/boost/lockfree/Quee.hpp: error:静态断言失败：(boost::has_trivial_destructor<T>::value)
/boost/lockfree/Quee.hpp: error:静态断言失败：(boost::has_trivial_destructor<T>::value)
提问于 2013-03-18 01:07:23
我试图在这个文件中用boost::lockfree::queue代替std::queue，server.cpp
我添加了#include <boost/lockfree/queue.hpp>；将行130、std::queue<action> m_actions;更改为boost::lockfree::queue<action> m_actions;；删除了与锁定相关的所有行；并将行103、m_actions.pop();更改为m_actions.pop(a);。
在将scons broadcast_server_lockfree添加到项目根的SConstruct并在broadcast_server_lockfree目录中使用broadcast_server的SConstruct后，当我在项目根目录中使用broadcast_server的SConstruct时，会得到以下错误：
root@server:~/websocketpp-experimental# scons broadcast_server_lockfree
scons: Reading SConscript files ...
C++11 build environment partially enabled
scons: done reading SConscript files.
scons: Building targets ...
scons: building associated VariantDir targets: build/release/broadcast_server_lockfree
g++ -o build/release/broadcast_server_lockfree/broadcast_server_lockfree.o -c -std=c++0x -Wall -Wcast-align -isystem /root/boost_1_53_0 -DNDEBUG -D_WEBSOCKETPP_CPP11_MEMORY_ -D_WEBSOCKETPP_CPP11_FUNCTIONAL_ -D_WEBSOCKETPP_CPP11_SYSTEM_ERROR_ -D_WEBSOCKETPP_CPP11_RANDOM_DEVICE_ -D_WEBSOCKETPP_NOEXCEPT_ -I. broadcast_server_lockfree/broadcast_server_lockfree.cpp
In file included from broadcast_server_lockfree/broadcast_server_lockfree.cpp:10:0:
/root/boost_1_53_0/boost/lockfree/queue.hpp: In instantiation of 'class boost::lockfree::queue<action>':
broadcast_server_lockfree/broadcast_server_lockfree.cpp:139:36: required from here
/root/boost_1_53_0/boost/lockfree/queue.hpp:79:5: error: static assertion failed: (boost::has_trivial_destructor<T>::value)
/root/boost_1_53_0/boost/lockfree/queue.hpp:83:5: error: static assertion failed: (boost::has_trivial_assign<T>::value)
broadcast_server_lockfree/broadcast_server_lockfree.cpp: In member function 'void broadcast_server::process_messages()':
broadcast_server_lockfree/broadcast_server_lockfree.cpp:111:34: error: 'class boost::lockfree::queue<action>' has no member named 'front'
broadcast_server_lockfree/broadcast_server_lockfree.cpp:117:55: error: 'm_connection_lock' was not declared in this scope
broadcast_server_lockfree/broadcast_server_lockfree.cpp:120:55: error: 'm_connection_lock' was not declared in this scope
broadcast_server_lockfree/broadcast_server_lockfree.cpp:123:55: error: 'm_connection_lock' was not declared in this scope
In file included from broadcast_server_lockfree/broadcast_server_lockfree.cpp:10:0:
/root/boost_1_53_0/boost/lockfree/queue.hpp: In instantiation of 'boost::lockfree::queue<T, A0, A1, A2>::~queue() [with T = action; A0 = boost::parameter::void_; A1 = boost::parameter::void_; A2 = boost::parameter::void_]':
broadcast_server_lockfree/broadcast_server_lockfree.cpp:41:24: required from here
/root/boost_1_53_0/boost/lockfree/queue.hpp:229:11: error: no matching function for call to 'action::action()'
/root/boost_1_53_0/boost/lockfree/queue.hpp:229:11: note: candidates are:
broadcast_server_lockfree/broadcast_server_lockfree.cpp:32:5: note: action::action(action_type, websocketpp::endpoint<websocketpp::connection<websocketpp::config::asio>, websocketpp::config::asio>::message_ptr)
broadcast_server_lockfree/broadcast_server_lockfree.cpp:32:5: note: candidate expects 2 arguments, 0 provided
broadcast_server_lockfree/broadcast_server_lockfree.cpp:31:5: note: action::action(action_type, websocketpp::connection_hdl)
broadcast_server_lockfree/broadcast_server_lockfree.cpp:31:5: note: candidate expects 2 arguments, 0 provided
broadcast_server_lockfree/broadcast_server_lockfree.cpp:30:8: note: action::action(const action&)
broadcast_server_lockfree/broadcast_server_lockfree.cpp:30:8: note: candidate expects 1 argument, 0 provided
In file included from broadcast_server_lockfree/broadcast_server_lockfree.cpp:10:0:
/root/boost_1_53_0/boost/lockfree/queue.hpp: In instantiation of 'boost::lockfree::queue<T, A0, A1, A2>::node::node(boost::lockfree::queue<T, A0, A1, A2>::node::handle_type) [with T = action; A0 = boost::parameter::void_; A1 = boost::parameter::void_; A2 = boost::parameter::void_; boost::lockfree::queue<T, A0, A1, A2>::node::handle_type = boost::lockfree::queue<action>::node*]':
/root/boost_1_53_0/boost/lockfree/detail/freelist.hpp:82:13: required from 'T* boost::lockfree::detail::freelist_stack<T, Alloc>::construct(const ArgumentType&) [with bool ThreadSafe = true; bool Bounded = false; ArgumentType = boost::lockfree::queue<action>::node*; T = boost::lockfree::queue<action>::node; Alloc = std::allocator<boost::lockfree::queue<action>::node>]'
/root/boost_1_53_0/boost/lockfree/queue.hpp:126:75: required from 'void boost::lockfree::queue<T, A0, A1, A2>::initialize() [with T = action; A0 = boost::parameter::void_; A1 = boost::parameter::void_; A2 = boost::parameter::void_]'
/root/boost_1_53_0/boost/lockfree/queue.hpp:166:9: required from 'boost::lockfree::queue<T, A0, A1, A2>::queue() [with T = action; A0 = boost::parameter::void_; A1 = boost::parameter::void_; A2 = boost::parameter::void_]'
broadcast_server_lockfree/broadcast_server_lockfree.cpp:41:24: required from here
/root/boost_1_53_0/boost/lockfree/queue.hpp:109:52: error: no matching function for call to 'action::action()'
/root/boost_1_53_0/boost/lockfree/queue.hpp:109:52: note: candidates are:
broadcast_server_lockfree/broadcast_server_lockfree.cpp:32:5: note: action::action(action_type, websocketpp::endpoint<websocketpp::connection<websocketpp::config::asio>, websocketpp::config::asio>::message_ptr)
broadcast_server_lockfree/broadcast_server_lockfree.cpp:32:5: note: candidate expects 2 arguments, 0 provided
broadcast_server_lockfree/broadcast_server_lockfree.cpp:31:5: note: action::action(action_type, websocketpp::connection_hdl)
broadcast_server_lockfree/broadcast_server_lockfree.cpp:31:5: note: candidate expects 2 arguments, 0 provided
broadcast_server_lockfree/broadcast_server_lockfree.cpp:30:8: note: action::action(const action&)
broadcast_server_lockfree/broadcast_server_lockfree.cpp:30:8: note: candidate expects 1 argument, 0 provided
scons: *** [build/release/broadcast_server_lockfree/broadcast_server_lockfree.o] Error 1
scons: building terminated because of errors.我对c++几乎一无所知，对错误的搜索没有任何结果(因为我不知道我在读什么)。
下面是boost::lockfree::queue示例，如果有帮助的话。http://boost-sandbox.sourceforge.net/doc/html/lockfree/examples.html
请教我怎么纠正这个问题。
action
struct action {
action(action_type t, connection_hdl h) : type(t), hdl(h) {}
action(action_type t, server::message_ptr m) : type(t), msg(m) {}
action_type type;
websocketpp::connection_hdl hdl;
server::message_ptr msg;
};回答 3
Stack Overflow用户
回答已采纳
发布于 2013-03-18 01:13:45
来自文档
T必须有一个复制构造函数、一个普通赋值操作符和一个普通析构函数。
因此，您的action类必须如下所示：
class action
{
public:
action(const action& rhs) { ... }
//Implicitly defined destructor for itself and all member variables
//Implicitly defined operator= for itself and all member variables
};static_assert正在抱怨，因为您的析构函数和operator=不是编译器隐式定义的(或者至少有一个action成员变量是这样的)。
编辑:我快速查看了回购程序--我似乎找不到connection_hdl，而且template <typename endpoint> class server中也没有message_ptr。无论哪种方式，websocketpp::connection_hdl hdl或server::message_ptr msg之一都不满足上述条件。仅仅“放入”一个没有锁的队列，而不是使用一个std::queue，这可能是一项非常重要的任务，需要进行大量的更改。
Stack Overflow用户
发布于 2019-03-29 21:04:09
这一问题在上述帖子中得到了很好的回答。在这里，我将提供更多的例子。富有成效的讨论给了我们很多指导，请大家阅读。真正的问题是对队列模板类型的需求。为了实用，让我们来看看一些实际的用例。
namespace lkf=boost::lockfree;
vector<lkf::spsc_queue<pair<Fastq*,int>, lkf::capacity<100>>> datastore;
//lkf::queue<pair<char*,char*>, lkf::capacity<100>> pile1, pile2; //failed assert
lkf::queue<pair<char*,char*>*, lkf::capacity<100>> pile1, pile2;代码中的第一行传递了编译器(因为它是spac_queue)，但是第二行对失败了编译器(原因是boost::ASSERT)：
/usr/local/include/boost/lockfree/queue.hpp:99:5: error: static assertion failed: (boost::has_trivial_assign<T>::value)
BOOST_STATIC_ASSERT((boost::has_trivial_assign<T>::value));将对转换为指针类型(第3行)之后，编译器就会很高兴了。
是否需要更新boost断言？转换为指针是一个快速的技巧，可能不是最好的。
boost无锁：：队列有三个要求
- T必须有一个副本构造函数。
- T必须有一个平凡的赋值运算符。
- T必须有一个平凡的析构函数。
spsc_queue有两个：
- T必须具有默认构造函数。
- T必须是可复制的
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/15468278
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