DPaste - Paste #736 - pastebin, online compiler and collaboration tool dedicated to D Programming Language

Code

import std.stdio;
import std.string : format;

class Foo {
public:
	this() {

}

void echo() const {
		writeln("FooBar");
	}
}

void ensure(T)(T obj, string filename = __FILE__, uint line = __LINE__) {
	assert(obj !is null, format("Object is Null @ %s on line %d.", filename, line));
}

struct scoped_ptr(T) {
private:
	T* _ptr;

public:
	@disable
	this();

@disable
	this(typeof(null));

@disable
	this(this);

this(ref T obj, string filename = __FILE__, uint line = __LINE__) {
		ensure(obj, filename, line);

this._ptr = &obj;
	}

~this() {
		writeln("DESTROY SCOPED");

if (this._ptr !is null) {
			*this._ptr = null;
		}
	}

ref scoped_ptr!(T) opAssign(ref T obj) {
		this._ptr = &obj;

return this;
	}

bool IsValid() const {
		return *this._ptr !is null;
	}

@property
	inout(T) Value() inout {
		return *this._ptr;
	}

alias Value this;
}

class Test {
private:
	scoped_ptr!(Foo) _sc_f;

public:
	this(ref Foo f) {
		writeln("this");
		this._sc_f = f;
		writeln("this");
	}

~this() {
		writeln("DTOR TEST");
	}

void echo() const {
		this._sc_f.echo();
	}
}

void main() {
	Foo f1 = new Foo();

{
		writeln("begin scope");
		assert(f1 !is null);
		scoped_ptr!(Foo) sc = f1;
		//assert(sc.IsValid());
		//sc.echo();
		//writeln("end scope");
	}

assert(f1 is null);

Foo f3 = new Foo();

Test t = new Test(f3);
	t.echo();
}

Application output:

begin scope
DESTROY SCOPED
this
this
FooBar
DTOR TEST
DESTROY SCOPED

Paste info

Author: Namespace

Views: 185

Private: no

Expires: Never

Uploaded: 21.07.12 22:51

Votes: 0

Compilation

Compiler: DMD 2.062

Pointer size: m64

Code

Application output:

Paste info

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