C/C++課題ネタ04_IPv4クラス

main_14.cpp

//==========
// IPv4データ型
// 1, Compile
//		g++ -std=c++17 -Wall -Wextra main.cpp
// 2, Run
//		./a.out

#include <math.h>
#include <sstream>
#include <stdio.h>
#include <string>
#include <vector>

using namespace std;

class IPv4{

public:
	vector<uint> octs;

public:
	IPv4(const string ip){
		//printf("IPv4\n");
		stringstream ss(ip);
		string str;
		while(getline(ss, str, '.')){
			uint num = stoi(str);
			if(num < 0) num = 0;
			if(255 < num) num = 255;
			octs.push_back(num);
		}
	}

	void show(){
		printf("IPv4: %d.%d.%d.%d\n", octs[0], octs[1], octs[2], octs[3]);
	}

	// operator ==
	friend bool operator==(const IPv4 &a, const IPv4 &b){
		for(int i=0; i<4; i++){
			if(a.octs[i] != b.octs[i]) return false;
		}
		return true;
	}

	// operator !=
	friend bool operator!=(const IPv4 &a, const IPv4 &b){
		return !(a == b);
	}

	// operator <
	friend bool operator<(const IPv4 &a, const IPv4 &b){
		for(int i=0; i<4; i++){
			if(a.octs[i] == b.octs[i]) continue;
			return a.octs[i] < b.octs[i];
		}
		return false;
	}

	friend bool operator<=(const IPv4 &a, const IPv4 &b){
		if(a < b) return true;
		if(a == b) return true;
		return false;
	}

	// operator >
	friend bool operator>(const IPv4 &a, const IPv4 &b){
		for(int i=0; i<4; i++){
			if(a.octs[i] == b.octs[i]) continue;
			return b.octs[i] < a.octs[i];
		}
		return false;
	}

	friend bool operator>=(const IPv4 &a, const IPv4 &b){
		if(a > b) return true;
		if(a == b) return true;
		return false;
	}
};

int main(){
	printf("Hello, Cpp!!\n");

	// IPv4
	IPv4 ipA("192.168.1.1");
	ipA.show();

	IPv4 ipB("192.168.1.2");
	ipB.show();

	// Compare
	if(ipA == ipB) printf("ipA == ipB\n");
	if(ipA < ipB)  printf("ipA <  ipB\n");
	if(ipA <= ipB) printf("ipA <= ipB\n");
	if(ipA > ipB)  printf("ipA >  ipB\n");
	if(ipA >= ipB) printf("ipA >= ipB\n");
	
	return 0;
}

main_15.cpp

//==========
// IPv4データ型(2進文字列として格納)
// 1, Compile
//		g++ -std=c++17 -Wall -Wextra main.cpp
// 2, Run
//		./a.out

#include <math.h>
#include <sstream>
#include <stdio.h>
#include <string>
#include <vector>

using namespace std;

class IPv4{

public:
	vector<uint> octs;
	string bin;
	uint addr;

public:
	IPv4(const string ip){
		//printf("IPv4\n");

		// Parse to vector
		stringstream ss(ip);
		string str;
		while(getline(ss, str, '.')){
			uint num = stoi(str);
			if(num < 0) num = 0;
			if(255 < num) num = 255;
			octs.push_back(num);
		}

		// Parse to string and uint
		for(uint num:octs) bin += bitset<8>(num).to_string();
		printf("bin: %s\n", bin.c_str());

		// Parse to uint
		addr = stoul(bin, 0, 2);
		printf("addr: %u\n", addr);

		// Test
		//const string test = bitset<32>(addr).to_string();
		//printf("test: %s\n", test.c_str());
	}

	void show(){
		printf("IPv4: %s\n", bin.c_str());
	}

	// operator ==
	friend bool operator==(const IPv4 &a, const IPv4 &b){
		return a.addr == b.addr;
	}

	// operator !=
	friend bool operator!=(const IPv4 &a, const IPv4 &b){
		return !(a == b);
	}

	// operator <
	friend bool operator<(const IPv4 &a, const IPv4 &b){
		return a.addr < b.addr;
	}

	friend bool operator<=(const IPv4 &a, const IPv4 &b){
		if(a < b) return true;
		if(a == b) return true;
		return false;
	}

	// operator >
	friend bool operator>(const IPv4 &a, const IPv4 &b){
		return a.addr > b.addr;
	}

	friend bool operator>=(const IPv4 &a, const IPv4 &b){
		if(a > b) return true;
		if(a == b) return true;
		return false;
	}
};

int main(){
	printf("Hello, Cpp!!\n");

	// IPv4
	IPv4 ipA("192.168.1.1");
	ipA.show();

	IPv4 ipB("192.168.1.2");
	ipB.show();

	// Compare
	if(ipA == ipB) printf("ipA == ipB\n");
	if(ipA < ipB)  printf("ipA <  ipB\n");
	if(ipA <= ipB) printf("ipA <= ipB\n");
	if(ipA > ipB)  printf("ipA >  ipB\n");
	if(ipA >= ipB) printf("ipA >= ipB\n");
	
	return 0;
}