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POAuto pointer (smart) in vector
 

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  1. POAuto pointer (smart) in vector
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    <p>I am having trouble in solving the below code. I understand auto_ptr cannot be used in STL due to the copy issue. But I am not able to solve this using the C++11 unique_ptr as well. Can you please help me solve this?</p> <p>Error:</p> <pre><code> $ g++ -std=c++0x autoinvec.cpp /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/unique_ptr.h: In copy constructor âvna_data::vna_data(const vna_data&amp;)â: /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/unique_ptr.h:214: error: deleted function âstd::unique_ptr&lt;_Tp, _Tp_Deleter&gt;::unique_ptr(const std::unique_ptr&lt;_Tp, _Tp_Deleter&gt;&amp;) [with _Tp = MyClass, _Tp_Deleter = std::default_delete&lt;MyClass&gt;]â autoinvec.cpp:11: error: used here /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/unique_ptr.h:214: error: deleted function âstd::unique_ptr&lt;_Tp, _Tp_Deleter&gt;::unique_ptr(const std::unique_ptr&lt;_Tp, _Tp_Deleter&gt;&amp;) [with _Tp = MyClass, _Tp_Deleter = std::default_delete&lt;MyClass&gt;]â autoinvec.cpp:11: error: used here autoinvec.cpp: In function âint main()â: autoinvec.cpp:39: note: synthesized method âvna_data::vna_data(const vna_data&amp;)â first required here autoinvec.cpp:39: error: initializing argument 1 of âvoid Usethis::pushmydata(VNADATA)â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/unique_ptr.h: In member function âvna_data&amp; vna_data::operator=(const vna_data&amp;)â: autoinvec.cpp:11: instantiated from âvoid std::vector&lt;_Tp, _Alloc&gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;typename std::_Vector_base&lt;_Tp, _Alloc&gt;::_Tp_alloc_type::pointer, std::vector&lt;_Tp, _Alloc&gt; &gt;, _Args&amp;&amp; ...) [with _Args = vna_data, _Tp = vna_data, _Alloc = std::allocator&lt;vna_data&gt;]â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/vector.tcc:100: instantiated from âvoid std::vector&lt;_Tp, _Alloc&gt;::emplace_back(_Args&amp;&amp; ...) [with _Args = vna_data, _Tp = vna_data, _Alloc = std::allocator&lt;vna_data&gt;]â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/stl_vector.h:747: instantiated from âvoid std::vector&lt;_Tp, _Alloc&gt;::push_back(_Tp&amp;&amp;) [with _Tp = vna_data, _Alloc = std::allocator&lt;vna_data&gt;]â autoinvec.cpp:27: instantiated from here /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/unique_ptr.h:219: error: deleted function âstd::unique_ptr&lt;_Tp, _Tp_Deleter&gt;&amp; std::unique_ptr&lt;_Tp, _Tp_Deleter&gt;::operator=(const std::unique_ptr&lt;_Tp, _Tp_Deleter&gt;&amp;) [with _Tp = MyClass, _Tp_Deleter = std::default_delete&lt;MyClass&gt;]â autoinvec.cpp:11: error: used here /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/unique_ptr.h:219: error: deleted function âstd::unique_ptr&lt;_Tp, _Tp_Deleter&gt;&amp; std::unique_ptr&lt;_Tp, _Tp_Deleter&gt;::operator=(const std::unique_ptr&lt;_Tp, _Tp_Deleter&gt;&amp;) [with _Tp = MyClass, _Tp_Deleter = std::default_delete&lt;MyClass&gt;]â autoinvec.cpp:11: error: used here In file included from /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/vector:69, from autoinvec.cpp:3: /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/vector.tcc: In member function âvoid std::vector&lt;_Tp, _Alloc&gt;::_M_insert_aux(__gnu_cxx::__normal_iterator&lt;typename std::_Vector_base&lt;_Tp, _Alloc&gt;::_Tp_alloc_type::pointer, std::vector&lt;_Tp, _Alloc&gt; &gt;, _Args&amp;&amp; ...) [with _Args = vna_data, _Tp = vna_data, _Alloc = std::allocator&lt;vna_data&gt;]â: /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/vector.tcc:314: note: synthesized method âvna_data&amp; vna_data::operator=(const vna_data&amp;)â first required here </code></pre> <p>Code:</p> <pre><code>#include&lt;iostream&gt; #include&lt;memory&gt; #include&lt;vector&gt; using namespace std; class MyClass { public: MyClass() { cout &lt;&lt; "Myclass const" &lt;&lt; endl; } }; typedef struct vna_data { string i; auto_ptr&lt;MyClass&gt; ap1; auto_ptr&lt;MyClass&gt; ap2; string j; string m; } VNADATA; class Usethis { vector&lt;VNADATA&gt; _data; public: Usethis() {cout &lt;&lt; "Usethis const" &lt;&lt; endl; } void pushmydata (VNADATA d); }; void Usethis::pushmydata(VNADATA d) { _data.push_back(d); } int main () { Usethis u; VNADATA da; da.i = "one"; da.j = "two"; da.m = "three"; da.ap1 = new MyClass(); da.ap2 = new MyClass(); u.pushmydata(da); return 0; } </code></pre> <p>Code with Unique_ptr:</p> <pre><code>#include&lt;iostream&gt; #include&lt;memory&gt; #include&lt;vector&gt; using namespace std; class MyClass { public: MyClass() { cout &lt;&lt; "Myclass const" &lt;&lt; endl; } }; typedef struct vna_data { string i; unique_ptr&lt;MyClass&gt; ap1; unique_ptr&lt;MyClass&gt; ap2; string j; string m; } VNADATA; class Usethis { vector&lt;VNADATA&gt; _data; public: Usethis() {cout &lt;&lt; "Usethis const" &lt;&lt; endl; } void pushmydata (VNADATA d); }; void Usethis::pushmydata(VNADATA d) { _data.push_back(move(d)); } int main () { Usethis u; VNADATA da; da.i = "one"; da.j = "two"; da.m = "three"; da.ap1.reset( new MyClass ); da.ap2.reset( new MyClass ); u.pushmydata(da); return 0; } </code></pre>
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    1. COYour code, as written, uses `auto_ptr`, not `unique_ptr`. Didn't you say already that you realize that wouldn't work?
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      1. USjogojapan
    2. COYeah, but with unique_ptr I think my usage is wrong and gives me error. I was hoping if someone can give me suggestions on the base code with either unique_ptr or other.
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    3. COPlease provide the code with your attempt to solve the problem with `unique_ptr`, or else any answer will try to give you some `auto_ptr` solution that is error-prone as you already realized. In other words, you should try to solve the `unique_ptr` problem, not the `auto_ptr` problem.
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      1. USArne Mertz
 

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