C++ 在C+中通过引用传递对象+；

在人们开始告诉我用谷歌搜索我的问题之前，让我说我已经尝试了很长一段时间了

<>我无法计算如何在C++中引用一个对象，我一直在获得大量编译器错误的打印输出。如果他们愿意帮忙，我可以把他们包括在内。具体来说，我试图通过引用线程中的函数parseFeed来传递RSSFeed对象提要

void parseFeed(RSSFeed& feed) {
    //dostuff
}

RSSFeed feed();
thread(parseFeed, feed); // line 119

错误：

g++ -g -Wall -pedantic -O0 -std=c++0x -D_GLIBCXX_USE_NANOSLEEP -D_GLIBCXX_USE_SCHED_YIELD -I/usr/class/cs110/include/libxml2 -I/usr/class/cs110/local/include   -c -o news-aggregator.o news-aggregator.cc
In file included from /usr/include/c++/4.6/functional:56:0,
                 from /usr/include/c++/4.6/bits/stl_algo.h:68,
                 from /usr/include/c++/4.6/algorithm:63,
                 from news-aggregator.cc:14:
rss-feed.h: In constructor âconstexpr std::_Head_base<_Idx, _Head, false>::_Head_base(const _Head&) [with long unsigned int _Idx = 0ul, _Head = RSSFeed]â:
/usr/include/c++/4.6/tuple:162:44:   instantiated from âconstexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(const _Head&, const _Tail& ...) [with long unsigned int _Idx = 0ul, _Head = RSSFeed, _Tail = {}]â
/usr/include/c++/4.6/tuple:423:24:   instantiated from âconstexpr std::tuple<_T1>::tuple(const _T1&) [with _T1 = RSSFeed]â
/usr/include/c++/4.6/functional:1362:70:   instantiated from âstd::_Bind_result<_Result, _Functor(_Bound_args ...)>::_Bind_result(_Functor&&, _Args&& ...) [with _Args = {RSSFeed&}, _Result = void, _Functor = void (*)(RSSFeed&), _Bound_args = {RSSFeed}]â
/usr/include/c++/4.6/functional:1477:41:   instantiated from âtypename std::_Bindres_helper<_Result, _Functor, _ArgTypes>::type std::bind(_Functor&&, _ArgTypes&& ...) [with _Result = void, _Functor = void (&)(RSSFeed&), _ArgTypes = {RSSFeed&}, typename std::_Bindres_helper<_Result, _Functor, _ArgTypes>::type = std::_Bind_result<void, void (*(RSSFeed))(RSSFeed&)>]â
/usr/include/c++/4.6/thread:135:9:   instantiated from âstd::thread::thread(_Callable&&, _Args&& ...) [with _Callable = void (&)(RSSFeed&), _Args = {RSSFeed&}]â
news-aggregator.cc:119:25:   instantiated from here
rss-feed.h:54:3: error: âRSSFeed::RSSFeed(const RSSFeed&)â is private
/usr/include/c++/4.6/tuple:97:25: error: within this context
/usr/include/c++/4.6/tuple:97:25: error: use of deleted function âRSSFeed::RSSFeed(const RSSFeed&)â
rss-feed.h:54:3: error: declared here
rss-feed.h: In constructor âstd::_Head_base<_Idx, _Head, false>::_Head_base(_UHead&&) [with _UHead = RSSFeed, long unsigned int _Idx = 0ul, _Head = RSSFeed]â:
/usr/include/c++/4.6/tuple:174:43:   instantiated from âstd::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(std::_Tuple_impl<_Idx, _Head, _Tail ...>&&) [with long unsigned int _Idx = 0ul, _Head = RSSFeed, _Tail = {}, std::_Tuple_impl<_Idx, _Head, _Tail ...> = std::_Tuple_impl<0ul, RSSFeed>]â
/usr/include/c++/4.6/tuple:434:51:   instantiated from âstd::tuple<_T1>::tuple(std::tuple<_T1>&&) [with _T1 = RSSFeed, std::tuple<_T1> = std::tuple<RSSFeed>]â
/usr/include/c++/4.6/functional:1368:78:   instantiated from âstd::_Bind_result<_Result, _Functor(_Bound_args ...)>::_Bind_result(std::_Bind_result<_Result, _Functor(_Bound_args ...)>&&) [with _Result = void, _Functor = void (*)(RSSFeed&), _Bound_args = {RSSFeed}, std::_Bind_result<_Result, _Functor(_Bound_args ...)> = std::_Bind_result<void, void (*(RSSFeed))(RSSFeed&)>]â
/usr/include/c++/4.6/functional:1477:41:   instantiated from âtypename std::_Bindres_helper<_Result, _Functor, _ArgTypes>::type std::bind(_Functor&&, _ArgTypes&& ...) [with _Result = void, _Functor = void (&)(RSSFeed&), _ArgTypes = {RSSFeed&}, typename std::_Bindres_helper<_Result, _Functor, _ArgTypes>::type = std::_Bind_result<void, void (*(RSSFeed))(RSSFeed&)>]â
/usr/include/c++/4.6/thread:135:9:   instantiated from âstd::thread::thread(_Callable&&, _Args&& ...) [with _Callable = void (&)(RSSFeed&), _Args = {RSSFeed&}]â
news-aggregator.cc:119:25:   instantiated from here
rss-feed.h:54:3: error: âRSSFeed::RSSFeed(const RSSFeed&)â is private
/usr/include/c++/4.6/tuple:101:42: error: within this context
/usr/include/c++/4.6/tuple:101:42: error: use of deleted function âRSSFeed::RSSFeed(const RSSFeed&)â
rss-feed.h:54:3: error: declared here

g++-g-Wall-pedantic-O0-std=c++0x-D_GLIBCXX_USE_NANOSLEEP-D_GLIBCXX_USE_SCHED_YIELD-I/usr/class/cs110/include/libxml2-I/usr/class/cs110/local/include-c-o新闻聚合器.o新闻聚合器.cc
在/usr/include/c++/4.6/functional:56:0中包含的文件中，
从/usr/include/c++/4.6/bits/stl_algo.h:68，
来自/usr/include/c++/4.6/算法：63，
来自新闻聚合器。抄送：14:
rss feed.h:在构造函数–constexpr std:：_Head_base:：_Head_base（const _Head&）[长无符号int _Idx=0ul，_Head=RSSFeed]中--
/usr/include/c++/4.6/tuple:162:44：实例化自-constexpr std:：\u tuple\u impl:：\u tuple\u impl（const\u Head&，const\u Tail&…）[长无符号int\u Idx=0ul，\u Head=RSSFeed，\u Tail={}]
/usr/include/c++/4.6/tuple:423:24：实例化自–constepr std:：tuple:：tuple（const_T1&）[with_T1=RSSFeed]
/usr/include/c++/4.6/functional:1362:70:实例化自–std:：_Bind_result:：_Bind_result（_Functor&&，_Args&&&…[带_Args={RSSFeed&}，_result=void，_Functor=void（*）（RSSFeed&）），_Bind_Args={RSSFeed}
/usr/include/c++/4.6/functional:1477:41:实例化自–typename std:：_Bindres_helper:：type std:：bind（_Functor&，_ArgTypes&&&…[带_Result=void，_Functor=void（&）（RSSFeed&），_ArgTypes={RSSFeed}，typename std:_Bindres_helper&：：type=std:_bind&&&&&&&&&&…[带&&u Result=void（&）]
/usr/include/c++/4.6/thread:135:9:实例化自–std:：thread:：thread（_Callable&&，_Args&&…[带_Callable=void（&）（RSSFeed&）），_Args={RSSFeed&}
新闻聚合器。cc:119:25：从此处实例化
RSSFeed.h:54:3:error:RSSFeed:：RSSFeed（const-RSSFeed&）是私有的
/usr/include/c++/4.6/tuple:97:25:error:在此上下文中
/usr/include/c++/4.6/tuple:97:25:错误：使用了已删除的函数&RSSFeed:：RSSFeed（const-RSSFeed&）
rss提要.h:54:3:错误：此处声明
rss feed.h:在构造函数中–std:：_Head\u base:：_Head\u base（_UHead&&）[with-u UHead=RSSFeed，long unsigned int\u Idx=0ul，_Head=RSSFeed]
/usr/include/c++/4.6/tuple:174:43：实例化自–std:：\u tuple\u impl:：\u tuple\u impl（std:：\u tuple\u impl&）[长无符号int\u Idx=0ul，\u Head=RSSFeed，\u Tail={}，std:\u tuple\u impl=std:\u tuple\u impl=std:\u tuple\u impl]
/usr/include/c++/4.6/tuple:434:51：实例化自–std:：tuple:：tuple（std:：tuple&）[with_T1=RSSFeed，std:：tuple=std:：tuple]
/usr/include/c++/4.6/functional:1368:78：实例化自–std:：_Bind_result:：_Bind_result&）[带_result=void，_Functor=void（*）（RSSFeed&），_Bind_args={RSSFeed}，std:_Bind_result=std:_Bind:_Bind_result=std:_Bind_result=std:_Bind_result]
/usr/include/c++/4.6/functional:1477:41:实例化自–typename std:：_Bindres_helper:：type std:：bind（_Functor&，_ArgTypes&&&…[带_Result=void，_Functor=void（&）（RSSFeed&），_ArgTypes={RSSFeed}，typename std:_Bindres_helper&：：type=std:_bind&&&&&&&&&&…[带&&u Result=void（&）]
/usr/include/c++/4.6/thread:135:9:实例化自–std:：thread:：thread（_Callable&&，_Args&&…[带_Callable=void（&）（RSSFeed&）），_Args={RSSFeed&}
新闻聚合器。cc:119:25：从此处实例化
RSSFeed.h:54:3:error:RSSFeed:：RSSFeed（const-RSSFeed&）是私有的
/usr/include/c++/4.6/tuple:101:42:错误：在此上下文中
/usr/include/c++/4.6/tuple:101:42:错误：使用了已删除的函数&RSSFeed:：RSSFeed（const-RSSFeed&）
rss提要.h:54:3:错误：此处声明

已解决： 线程（parseFeed，ref（feed））；//第119行

RSSFeed feed();

是一个函数声明，返回RSSFeed类型的对象，并且没有参数。它不是对象定义

改写

RSSFeed feed;

从错误消息列表中还可以看出，类RSSFeed没有定义为已删除的复制构造函数

这个

RSSFeed feed();

是一个函数声明，返回RSSFeed类型的对象，并且没有参数。它不是对象定义

改写

RSSFeed feed;

---

从错误消息列表中还可以看出，类RSSFeed没有定义为已删除的复制构造函数

此问题称为一个

vexing parse

，请参阅/***构造函数：RSSFeed*用法：RSSFeed feed（“）；*-----------------------------------------------------------------------------------------------*围绕提供的URL构造一个RSSFeed对象。*/RSSFeed（const std:：string&URL）：URL（URL）{}我不认为这是问题所在，我省略了构造函数的参数，但当我使用feed作为变量时，代码工作得很好。@MaxBozzi不，这只是一个麻烦的解析。最麻烦的解析应该是

X（X（））

@0x499602D2嘿，我甚至链接到一个页面，解释说：）我将行更改为RSSFeed feed=RSSFeed（it->first）；但现在我得到了错误--rss feed.h:In函数–void processallfeed（const string&）–rss feed.h:54:3:error:In–error–RSSFeed:：RSSFeed（const RSSFeed&）–is private news aggregator.cc:117:35:error:在这个上下文新闻聚合器中。cc:117:35:error:使用删除的函数–RSSFeed:：RSSFeed（const RSSFeed&）–rss-feed.h:54:3:error:在此处声明此问题称为一个

vexing解析

，请参见/***构造函数：RSSFeed*用法：RSSFeed提要（“）；*------------------------------------------------------------------------------------------------------------------------*围绕提供的URL构造RSSFeed对象。*/RSSFeed（const std:：string&url）：url（url）{}我不认为这是问题所在，我省略了构造函数的参数，但当我使用feed作为变量时，代码运行良好。@MaxBozzi不，这只是一个麻烦的解析。一个非常烦人的问题