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/* |
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Author: J C Calvarese |
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License: Public Domain |
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Purpose: Determine whether an item is an object or not. |
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*/ |
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import std.stdio; |
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struct myStruct |
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{ |
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int item1; |
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int item2; |
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} |
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class MyClass |
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{ |
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int myInt1; |
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int myInt2; |
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|
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this() |
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{ |
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writefln("MyClass initialized."); |
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} |
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} |
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class MyOtherClass |
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{ |
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double d1; |
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this() |
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{ |
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writefln("MyOtherClass initialized."); |
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} |
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} |
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void main() |
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{ |
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MyClass mc = new MyClass; |
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myStruct ms; |
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int someInt; |
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if(!(cast(Object)mc is null)) writefln("mc is an object (by casting)"); |
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if(!(cast(MyClass)mc is null)) writefln("mc is a MyClass object (by casting)"); |
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if(!(cast(MyOtherClass)mc is null)) writefln("mc is a MyOtherClass object (by casting)"); |
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//if(!(cast(Object)ms is null)) writefln("ms is an object"); //error: cannot cast from myStruct to object.Object |
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//if(!(cast(Object)someInt is null)) writefln("someInt is an object"); //error: cannot cast from int to object.Object |
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if(typeid(typeof(mc)) == typeid(MyClass)) writefln("mc is a MyClass (by typeid)"); |
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if(typeid(typeof(ms)) == typeid(MyClass)) writefln("ms is a MyClass (by typeid)"); |
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if(typeid(typeof(someInt)) == typeid(MyClass)) writefln("someInt is a MyClass (by typeid)"); |
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if(typeid(typeof(mc)) == typeid(MyOtherClass)) writefln("mc is a MyOtherClass (by typeid)"); /* Oops, I guess all objects have the same typeid */ |
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if(typeid(typeof(ms)) == typeid(MyOtherClass)) writefln("ms is a MyOtherClass (by typeid)"); |
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if(typeid(typeof(someInt)) == typeid(MyOtherClass)) writefln("someInt is a MyOtherClass (by typeid)"); |
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if(typeid(typeof(mc)) == typeid(Object)) writefln("mc is an object (by typeid)"); |
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if(typeid(typeof(ms)) == typeid(Object)) writefln("ms is an object (by typeid)"); |
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if(typeid(typeof(someInt)) == typeid(Object)) writefln("someInt is an object (by typeid)"); |
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if(typeid(typeof(mc)) == typeid(myStruct)) writefln("mc is a myStruct (by typeid)"); |
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if(typeid(typeof(ms)) == typeid(myStruct)) writefln("ms is a myStruct (by typeid)"); |
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if(typeid(typeof(someInt)) == typeid(myStruct)) writefln("someInt is a myStruct (by typeid)"); |
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if(typeid(typeof(mc)) == typeid(int)) writefln("mc is an int (by typeid)"); |
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if(typeid(typeof(ms)) == typeid(int)) writefln("ms is an int (by typeid)"); |
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if(typeid(typeof(someInt)) == typeid(int)) writefln("someInt is an int (by typeid)"); |
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} |
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