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POC++ trouble with extern - undefined reference
 

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  1. POC++ trouble with extern - undefined reference
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    <p><strong>main.cpp:</strong></p> <pre><code>bool lgstatus; User currentUser; //... int main(){ //... } </code></pre> <p><strong>loginwindow.cpp:</strong></p> <pre><code>void LoginWindow::on_cmdCreate_clicked() { extern bool lgstatus; extern User currentUser; //... currentUser.setMail(ui-&gt;txtAccountMail-&gt;text().toStdString()); currentUser.setName(ui-&gt;txtAccountName-&gt;text().toStdString()); currentUser.setPassword(ui-&gt;txtAccountPassword-&gt;text().toStdString()); //... lgstatus = true; } </code></pre> <p>My class <code>User</code> has 3 functions. Each of them takes a string as argument. I don't know whats wrong. The compiler doesn't complain if I change <code>lgstatus</code> but my <code>currenUser</code>. </p> <p>Class :</p> <pre><code>class User { public: User(); User(const std::string &amp;name, const std::string &amp;password); User(const std::string &amp;name, const std::string &amp;password, const std::string &amp;mail); void setName(const std::string &amp;name); void setMail(const std::string &amp;mail); void setPassword(const std::string &amp;password); private: std::string user_name; std::string user_password; std::string user_mail; }; </code></pre> <p>The "set" functions simply pass their argument to the user_name etc. I don't think it would be necessary to show them as well.</p> <p>Errors : </p> <ul> <li><p>undefined reference to 'User::setMail(std::string const&amp;)' </p></li> <li><p>undefined reference to 'User::setName(std::string const&amp;)'</p></li> <li><p>undefined reference to `User::setPassword(std::string const&amp;)'</p></li> </ul> <p>What did I do wrong?</p>
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    1. USDavlog
    1. USDavlog
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    1. COAre you compiling and linking `User.cpp` (or whichever file contains the implementation of the `User` class) along with the other source files too?
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    2. CODo you have an include file to show the complete definition of `User` class?
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      1. USunxnut
    3. COYou need to show the definition your User class. With simple set methods, you probably want to define inline, and you probably only have method declarations.
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      1. POC++ trouble with extern - undefined reference
      1. USScott Jones
 

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