いろんな言語でOOPする

そろそろObjective-Cの勉強もしたくなったのいろんな言語でOOPしてみました。 Javaで書いた1+2だけをするプログラムををC++/Objective-C/Swiftで書いてみます。 これで少しiPhoneアプリのソースも読めそうです。 あとObjective-Cの硬い感じに慣れるとSwiftのチャラっとした感じは受け付けないのも少し理解できました。 ただ結局iPhoneもAndroidもロジックは同じC++が使えるのでC++が結局生き残るだろうなとも思います。 リソース管理はスマートポインタで少し改善できているし、最終的にC++でないとできないことも多いだろうし。

Java

	interface Calculator{
	int add();
	}

view raw Calculator.java hosted with ❤ by GitHub

	class CalculatorImpl implements Calculator{
	private int a,b;
	CalculatorImpl(int a, int b){
	this.a = a;
	this.b = b;
	}
	public int add(){
	int c = a + b;
	return c;
	}
	}

view raw CalculatorImpl.java hosted with ❤ by GitHub

	class Main{
	public static void main(String args[]){
	Calculator calc = new CalculatorImpl(1,2);
	int result = calc.add();
	System.out.println(result);
	}
	}

view raw Main.java hosted with ❤ by GitHub

C++

	#include "calculator.h"
	calculator::calculator(int a, int b){
	this->a = a;
	this->b = b;
	}
	int calculator::add(){
	int c = a + b;
	return c;
	}

view raw calculator.cpp hosted with ❤ by GitHub

	#ifndef Calc_calc_h
	#define Calc_calc_h
	class calculator{
	private:
	int a,b;
	public:
	calculator(int a, int b);
	int add();
	};
	#endif

view raw calculator.h hosted with ❤ by GitHub

	#include <iostream>
	#include <memory>
	#include "calculator.h"
	using namespace std;
	int main(int argc, const char * argv[]) {
	//calculator *calc = new calculator(1,2);
	unique_ptr<calculator> calc(new calculator(1,2));
	int result = calc->add();
	cout << result << endl;
	//delete calc;
	return 0;
	}

view raw main.cpp hosted with ❤ by GitHub

Objective-C

	#ifndef Calc_objc_Calculator_h
	#define Calc_objc_Calculator_h
	#import <Foundation/Foundation.h>
	@interface Calculator : NSObject{
	@private
	int a,b;
	}
	-(id)initWithNum:(int)a b: (int)b;
	-(int)add;
	@end
	#endif

view raw calculator.h hosted with ❤ by GitHub

	#import <Foundation/Foundation.h>
	#import "Calculator.h"
	@implementation Calculator
	-(id)initWithNum:(int)a b:(int)b{
	if(self = [super init]){
	self->a = a;
	self->b = b;
	}
	return self;
	}
	-(int)add{
	int c = a + b;
	return c;
	}
	@end

view raw calculator.m hosted with ❤ by GitHub

	#import "Calculator.h"
	int main(int argc, const char * argv[]) {
	@autoreleasepool {
	Calculator * calc = [[Calculator alloc]initWithNum: 1 b:2];
	int result = [calc add];
	NSLog(@"%d",result);
	}
	return 0;
	}

view raw main.m hosted with ❤ by GitHub

Swift

	class Calculator:CalculatorProtocol{
	var a: Int
	var b: Int
	init(a: Int, b: Int){
	self.a = a
	self.b = b
	}
	func add() -> Int{
	let c = a + b
	return c
	}
	}

view raw Calculator.swift hosted with ❤ by GitHub

	import Foundation
	protocol CalculatorProtocol{
	func add() -> Int
	}

view raw CalculatorProtocol.swift hosted with ❤ by GitHub

	var calc = Calculator(a:1,b:2)
	var result = calc.add()
	println(result)

view raw main.swift hosted with ❤ by GitHub