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POc++ How to correctly split a .cpp into a .cpp and a .h
 

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  1. POc++ How to correctly split a .cpp into a .cpp and a .h
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    <p>I'm really new to splitting a .cpp into a .cpp and a .h.</p> <p>I've used .h files before, but never really split a .cpp into a .cpp and a .h.</p> <p>I know .h files are only for declarations and .cpp are for definitions, and I attempted to split a .cpp into a .cpp and a .h but I get a lot of errors, so I was wondering if someone can help me with my code.</p> <p>The following class is the class that has NOT yet been split into a .cpp and a .h yet, just to show you guys the "before version".</p> <p>TicketOrder.cpp</p> <pre><code>#include &lt;iostream&gt; using namespace std; class TicketOrder { private : char type; int quantity; public : friend std::ostream&amp; operator&lt;&lt;(std::ostream&amp; os, TicketOrder const&amp; order) { os &lt;&lt; " Type: " &lt;&lt; order.type &lt;&lt; ", Quantity: " &lt;&lt; order.quantity; return os; } //Getters int getQuantity() const; { return quantity; } char getType() const; { return type; } //Setters void setQuantity (int x) { quantity =x; } void setType(char y) { type =y; } }; </code></pre> <p>Now, I will split that above class into a .cpp and a .h</p> <p>TicketOrder.cpp</p> <pre><code>#include &lt;iostream&gt; #include "TicketOrder.h" using namespace std; class TicketOrder { //Getters int getQuantity() const { return quantity; } char getType() const { return type; } //Setters void setQuantity (int x) { quantity =x; } void setType(char y) { type =y; } }; </code></pre> <p>TicketOrder.h</p> <pre><code>#include &lt;iostream&gt; using namespace std; class TicketOrder { private : char type; int quantity; public : friend std::ostream&amp; operator&lt;&lt;(std::ostream&amp; os, TicketOrder const&amp; order) { os &lt;&lt; " Type: " &lt;&lt; order.type &lt;&lt; ", Quantity: " &lt;&lt; order.quantity; return os; } //Getters int getQuantity() const; char getType() const; //Setters void setQuantity (int x); void setType(char y); }; </code></pre> <p>I have one other class that is used to contain the main class that I will not include in here because it's long and I do not think it's important because I know I'm doing the .h and .cpp wrong. </p> <p>When I try to compile the main, it gives me this error:</p> <pre><code>Undefined first referenced symbol in file TicketOrder::getQuantity() const /var/tmp//ccaSflFG.o TicketOrder::setType(char) /var/tmp//ccaSflFG.o TicketOrder::setQuantity(int) /var/tmp//ccaSflFG.o ld: fatal: Symbol referencing errors. No output written to a.out collect2: ld returned 1 exit status </code></pre> <p>Can anyone help me with splitting the .h and the .cpp? Or give me suggestions? I did a lot of research and can't figure out what's wrong.</p> <p>Thank you.</p>
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    1. CO1) use a minimal example, 2) go easy with the whitespace, 3)don't duplicate the declaration of `TicketOrder`.
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      1. USBeta
    2. CODuplicate declarations of the class would be fine (those look like `class TicketOrder;`, but here we have a duplicate *definition*.
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    3. CO@BenVoigt, you're right, I stand corrected.
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