<p>I apologize if this is a simple question, but I am coming from a Java / C++ background and get a little tripped up by Go.</p>
<p>So here is my question. Lets say we have the following:</p>
<pre><code>myProgram/
main.go
cart/
cart.go //Contains only interface / structs
packageWhereInterfacesAreImplemented/
</code></pre>
<p>How could I write to the interfaces in cart from packageWhereInterfacesAreImplemented? The idea being that if I want to change how my cart is implemented then all I do is change the package packageWhereInterfacesAreImplemented to whatever I want.</p>
<p>Normally I just implement the interfaces and then the compiler links it all up, but Go uses implicit implementation. Would I just write go files that implement the specific interfaces and that will do it?</p>
<hr/>**评论：**<br/><br/>nliadm: <pre><p>Yes, interfaces are satisfied implicitly.</p>
<p>You can have the compiler check the interface for you if you assign to a discard variable of the type you want:</p>
<p><code>
var _ io.Writer = (*myWriter)(nil)
</code></p></pre>Fireynis: <pre><p>OK, interesting, thank you.</p></pre>
