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POboost::variant, shared-ptr error in assignment
 

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  1. POboost::variant, shared-ptr error in assignment
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    <p>I'm have the following elements:</p> <pre><code>#define TEMPLATE_PARAM boost::variant&lt;int, const std::string&amp;, const std::vector&lt;std::string&gt;&amp;, const std::vector&lt;int&gt;&amp;, const ITemplateLoop*, const std::vector&lt;ITemplateLoop*&gt;&amp;&gt; class PostParam { ... const std::string &amp;getParam() const; }; class ParamContainer { std::map&lt;std::string, TEMPLATE_PARAM&gt; map_; template &lt;typename T&gt; void insert(std::string key, const T &amp; value) { map_[key] = value; } public: template&lt;typename ... Args&gt; void add(std::map&lt;std::string, std::shared_ptr&lt;PostParam&gt;&gt;&amp; param, Args ... args) { for (const auto &amp; key : param) insert(key.first, key.second-&gt;getParam()); if (sizeof ...(Args) &gt; 0) add(args...); } </code></pre> <p>I am getting a lot of compilation error and I don't know what to paste here</p> <pre><code>/usr/local/include/boost/detail/reference_content.hpp: In member function 'void boost::detail::variant::move_storage::internal_visit(T&amp;, int) const [with T = boost::de tail::reference_content&lt;const std::basic_string&lt;char&gt;&amp;&gt;]': /usr/local/include/boost/variant/detail/visitation_impl.hpp:130:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke_impl(int, Visitor&amp;, VoidPtrCV, T*, mpl_::true_) [with Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content&lt;const std::basic_string&lt;char&gt;&amp;&gt;, typename Visitor::result_type = void, mpl_::true_ = mpl_::bool_&lt;true&gt;]' /usr/local/include/boost/variant/detail/visitation_impl.hpp:173:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke(int, Visitor&amp;, VoidPtrCV, T*, NoBackupFlag, int) [with Visitor=boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content&lt;const std::basic_string&lt;char&gt;&amp;&gt;, NoBackupFlag = boost::variant&lt;int, const std::basic_string&lt;char&gt;&amp;, const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;, const std::vector&lt;int&gt;&amp;, const TemplateEngine::ITemplateLoop*, const std::vector&lt;TemplateEngine::ITemplateLoop*&gt;&amp;, const PostParam&amp;&gt;::has_fallback_type_, typename Visitor::result_type = void]' /usr/local/include/boost/variant/detail/visitation_impl.hpp:260:1: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl(int, int, Visitor&amp;, VoidPtrCV, mpl_::false_, NoBackupFlag, Which*, step0*) [with Which = mpl_::int_&lt;0&gt;, step0 = boost::detail::variant::visitation_impl_step&lt;boost::mpl::l_iter&lt; boost::mpl::l_item&lt;mpl_::long_&lt;7l&gt;, int, boost::mpl::l_item&lt;mpl_::long_&lt;6l&gt;, boost::detail::reference_content&lt;const std::basic_string&lt;char&gt;&amp;&gt;, boost::mpl::l_item&lt;mpl_: :long_&lt;5l&gt;, boost::detail::reference_content&lt;const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;&gt;, boost::mpl::l_item&lt;mpl_::long_&lt;4l&gt;, boost::detail::reference_content&lt;const std::vector&lt;int&gt;&amp;&gt;, boost::mpl::l_item&lt;mpl_::long_&lt;3l&gt;, const TemplateEngine::ITemplateLoop*, boost::mpl::l_item&lt;mpl_::long_&lt;2l&gt;, boost::detail::reference_content&lt;const std::vector&lt;TemplateEngine::ITemplateLoop*&gt;&amp;&gt;, boost::mpl::l_item&lt;mpl_::long_&lt;1l&gt;, boost::detail::reference_content&lt;const PostParam&amp;&gt;, boost::mpl::l_end&gt; &gt; &gt; &gt; &gt; &gt; &gt; &gt;, boost::mpl::l_iter&lt;boost::mpl::l_end&gt; &gt;, Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, NoBackupFlag = boost::variant&lt;int, const std::basic_string&lt;char&gt;&amp;, const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;, const std::vector&lt;int&gt;&amp;, const TemplateEngine::ITemplateLoop*, const std::vector&lt;TemplateEngine::ITemplateLoop*&gt;&amp;, const PostParam&amp;&gt;::has_fallback_type_, typename Visitor::result_type = void, mpl_::false_ = mpl_::bool_&lt;false&gt;]' </code></pre> <p>I think it's the parameter that I get using key.second->getParam() but I'm unable to find a solution</p> <p><em><strong>Edit</em></strong></p> <p>I have changed the #define to the typedef So the error message</p> <pre><code>/home/django/cloaked-ninja/includes/TemplateEngine.hpp:67:7: instantiated from 'void TemplateEngine::ParamContainer::insert(std::string, const T&amp;) [with T = std::basic_string&lt;char&gt;, std::string = std::basic_string&lt;char&gt;]' /home/django/cloaked-ninja/includes/TemplateEngine.hpp:94:2: instantiated from 'void TemplateEngine::ParamContainer::add(std::map&lt;std::basic_string&lt;char&gt;, std::shared_ptr&lt;PostParam&gt; &gt;&amp;, Args ...) [with Args = {}]' /home/django/cloaked-ninja/src/Controller/ControllerPost.cpp:22:14: instantiated from here /usr/local/include/boost/detail/reference_content.hpp:62:24: error: 'boost::detail::reference_content&lt;RefT&gt;&amp; boost::detail::reference_content&lt;RefT&gt;::operator=(const boost::detail::reference_content&lt;RefT&gt;&amp;) [with RefT = const std::basic_string&lt;char&gt;&amp;, boost::detail::reference_content&lt;RefT&gt; = boost::detail::reference_content&lt;const std::basic_string&lt;char&gt;&amp;&gt;]' is private /usr/local/include/boost/variant/variant.hpp:583:9: error: within this context /usr/local/include/boost/detail/reference_content.hpp: In member function 'void boost::detail::variant::move_storage::internal_visit(T&amp;, int) const [with T = boost::de tail::reference_content&lt;const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;&gt;]': /usr/local/include/boost/variant/detail/visitation_impl.hpp:130:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke_impl(int, Visitor&amp;, VoidPtrCV, T*, mpl_::true_) [with Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content&lt;const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;&gt;, typename Visitor::result_type = void, mpl_::true_ = mpl_::bool_&lt;true&gt;]' /usr/local/include/boost/detail/reference_content.hpp: In member function 'void boost::detail::variant::move_storage::internal_visit(T&amp;, int) const [with T = boost::detail::reference_content&lt;const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;&gt;]': /usr/local/include/boost/variant/detail/visitation_impl.hpp:130:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke_impl(int, Visitor&amp;, VoidPtrCV, T*, mpl_::true_) [with Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content&lt;const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;&gt;, typename Visitor::result_type = void, mpl_::true_ = mpl_::bool_&lt;true&gt;]' /usr/local/include/boost/variant/detail/visitation_impl.hpp:173:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke(int, Visitor&amp;, VoidPtrCV, T*, NoBackupFlag, int) [with Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content&lt;const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;&gt;, NoBackupFlag = boost::variant&lt;int, const std::basic_string&lt;char&gt;&amp;, const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;, const std::vector&lt;int&gt;&amp;, const TemplateEngine::ITemplateLoop*, const std::vector&lt;TemplateEngine::ITemplateLoop*&gt;&amp;&gt;::has_fallback_type_, typename Visitor::result_type = void]' /usr/local/include/boost/variant/detail/visitation_impl.hpp:260:1: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl(int, int, Visitor&amp;, VoidPtrCV, mpl_::false_, NoBackupFlag, Which*, step0*) [with Which = mpl_::int_&lt;0&gt;, step0 = boost::detail::variant::visitation_impl_step&lt;boost::mpl::l_iter&lt;boost::mpl::l_item&lt;mpl_::long_&lt;6l&gt;, int, boost::mpl::l_item&lt;mpl_::long_&lt;5l&gt;, boost::detail::reference_content&lt;const std::basic_string&lt;char&gt;&amp;&gt;, boost::mpl::l_item&lt;mpl_::long_&lt;4l&gt;, boost::detail::reference_content&lt;const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;&gt;, boost::mpl::l_item&lt;mpl_::long_&lt;3l&gt;, boost::detail::reference_content&lt;const std::vector&lt;int&gt;&amp;&gt;, boost::mpl::l_item&lt;mpl_::long_&lt;2l&gt;, const TemplateEngine::ITemplateLoop*, boost::mpl::l_item&lt;mpl_::long_&lt;1l&gt;, boost::detail::reference_content&lt;const std::vector&lt;TemplateEngine::ITemplateLoop*&gt;&amp;&gt;, boost::mpl::l_end&gt; &gt; &gt; &gt; &gt; &gt; &gt;, boost::mpl::l_iter&lt;boost::mpl::l_end&gt; &gt;, Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, NoBackupFlag = boost::variant&lt;int, const std::basic_string&lt;char&gt;&amp;, const std::vector&lt;std::basic_string&lt;char&gt; &gt;&amp;, const std::vector&lt;int&gt;&amp;, const TemplateEngine::ITemplateLoop*, const std::vector&lt;TemplateEngine::ITemplateLoop*&gt;&amp;&gt;::has_fallback_type_, typename Visitor::result_type = void, mpl_::false_ = mpl_::bool_&lt;false&gt;]' </code></pre> <p><em><strong>Edit2</em></strong></p> <p>I have just changed the #define to the following typedef and it's now working:</p> <pre><code> typedef boost::variant&lt;int, const std::string*, const std::vector&lt;std::string&gt;*, const std::vector&lt;int&gt;*, const ITemplateLoop*, const std::vector&lt;ITemplateLoop*&gt;*&gt; TEMPLATE_PARAM; </code></pre>
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    1. COYou didn't copy paste the error message but only the code which triggered it. It should contains the word "error" !
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    2. COWhy use a macro instead of a typedef?
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      1. USJonathan Wakely
    3. CO`#define TEMPLATE_PARAM` is terrible style - it pollutes every file you include your header into, and you could so easily bypass it by using a (as far as I can see) private `typedef` instead
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