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POc++ private member variable unknown in another function
 

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  1. POc++ private member variable unknown in another function
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    <p>I have a newbie question about how to assign class member (setter). I am used to scripting and mostly there it's done via (in python)</p> <pre><code>def set_mymember(mymember): self.mymeber = mymember </code></pre> <p>My coworker told me "self" and "this" are not needed in C++ , "this" exists and it's not wrong in this context but that would be hard to understand for me so he said I should not care. So I first tried according to his advice:</p> <p>My class definition: - (it should create a sql query string)</p> <pre><code>class Query { public: Query() { } ~Query() { } void setoptions( std::string qtext_where="", bool qtext_erl=true, std::vector&lt;std::string&gt; kids=std::vector&lt;std::string&gt;() ); Query build_query( ); void set_db_table( std::string db_table ); void set_db_key( std::string db_key ); void set_m_qtext( std::string m_qtext ); void set_foo( std::string foo ); std::string sql(); std::string get_sql_update(); private: std::string m_db_table; // Tabellenname std::string m_db_key; // Tabellen-key std::string m_qtext_where; // add.optionale where clause std::string m_qtext; // fertiger SELECT std::string m_sql_update; // fertiger UPDATE bool m_erl; // nur erledigte waehlen? std::vector&lt;std::string&gt; m_kids; // Liste von keys zu selecten }; </code></pre> <p>ANd here's one of the setter methods: I call them with filled string and vector, double check it in this code</p> <pre><code>void Query::setoptions( string qtext_where, bool erl, vector&lt;string&gt; kids ) { m_qtext_where = qtext_where; m_erl = erl; m_kids = kids; } </code></pre> <p>But when my app later calls <code>query.build_query()</code></p> <p>the variables are empty </p> <pre><code>Query Query::build_query( ) { cout &lt;&lt; "kids size" &lt;&lt; m_kids.size() &lt;&lt; endl; cout &lt;&lt; "m_qtext_where " &lt;&lt; m_qtext_where &lt;&lt; endl; // Query zur auswahl der zu uebertragenden Datensaetze string sql_update = "UPDATE " + m_db_table; string qtext = "SELECT * FROM " + m_db_table; string qtext_order = " ORDER BY " + m_db_key; (...) </code></pre> <p><strong>EDIT</strong>: So here's part of the app code which calls 1.setoptions, and 2.build_query</p> <pre><code> // read file line by line into vector of strings vector&lt;string&gt; text_file; ifstream ifs( input ); string temp; while( getline( ifs, temp ) ) { if (temp.substr(0,1) == "#" ) { cout &lt;&lt; "COMMENT: " &lt;&lt; temp &lt;&lt; endl; continue; } cout &lt;&lt; temp &lt;&lt; endl; text_file.push_back( temp ); } // check: yes, vector has a size = number of lines cout &lt;&lt; "text_file size " &lt;&lt; text_file.size() &lt;&lt; endl; // create Query object Query query = Query(); // set the members, bool erl = true query.setoptions( "", erl, text_file ); // call 2nd method q2 = query.build_query(); </code></pre>
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      1. PTAnswer
    1. This table or related slice is empty.
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    1. USgroovehunter
    1. USgroovehunter
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POc++ private member variable unknown in another function
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      1. VTUpMod
    2. VO
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      1. VTUpMod
    1. COYou need to provide how did you call setoptions.
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      1. USblottedscience
    2. COdid you call SetOptions first before calling build_query?
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      1. USJeeva
    3. COSo, which private member variable is unknown in another function? Which is another function? Also, try to translate german into english :)
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      1. POc++ private member variable unknown in another function
      1. USBЈовић
 

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