DPaste - Paste #2259 - pastebin, online compiler and collaboration tool dedicated to D Programming Language

Code

import std.stdio;

struct Num {
private:
	union Num_ {
		float fvalue;
		int ivalue;
	}
	
	final enum Type {
		None,
		Float,
		Int
	}
	
	Num_ _num;
	Type _type;
	
	//bool _assigned;
	
private:
	void _assign(T)(T val) {
		static if (is(T : int)) {
			writeln("foo : ", val);
			
			this._type = Type.Int;
			this._num.ivalue = val;
		} else if (is(T : float)) {
			writeln("bar : ", val);
			
			this._type = Type.Float;
			this._num.fvalue = val;
		} else {
			throw new Exception("Unefined number type.");
		}
	}
	
public:
	this(T)(T val) {
		this._assign(val);
	}
	
	typeof(this) opAssign(T)(T val) {
		this._assign(val);
		
		return this;
	}
	
	@property
	auto get() const {
		write(" -> ", this._type, " : ");
		
		switch (this._type) {
			case Type.Int:   write("ret: ", this._num.ivalue, " <-> "); return this._num.ivalue;
			case Type.Float: return this._num.fvalue;
			default: writeln("default"); return 0;
		}
	}
	
	alias get this;
}

void main() {
	Num zahl;
	zahl = 3.14;
	writeln("zahl is ", zahl);
	zahl = 42;
	writeln("zahl is now ", zahl);
}

Application output:

bar : 3.14
zahl is -> Float : 3.14
foo : 42
zahl is now -> Int : ret: 42 <-> 0

Paste info

Author: Namespace

Views: 172

Private: no

Expires: Never

Uploaded: 11.09.12 19:01

Votes: 0

Compilation

Compiler: DMD 2.060

Pointer size: m64

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