update new implement functions

Author: supermarkion

list.cpp

@@ -0,0 +1,46 @@
+// list.cpp -- using a list
+#include <iostream>
+#include <list>
+#include <iterator>
+
+int main()
+{
+	using namespace std;
+	list<int> one (5, 2);
+	int stuff[5] = {1, 2, 4, 8, 6};
+	list<int> two;
+	two.insert (two.begin(), stuff, stuff + 5);
+	int more[6] = {6, 4, 2, 4, 6, 5};
+	list<int> three (two);
+	three.insert(three.end(), more, more + 6);
+
+	cout << "List one: ";
+	ostream_iterator<int, char> out (cout, " ");
+	copy (one.begin(), one.end(), out);
+	cout << endl << "List two: ";
+	copy (two.begin(), two.end(), out);
+	cout << endl << "List three: ";
+	copy (three.begin(), three.end(), out);
+	three.remove (2);
+	cout << endl << "List three minus 2s: ";
+	copy (three.begin(), three.end(), out);
+	three.splice (three.begin(), one);
+	cout << endl << "List three after splices: ";
+	copy (three.begin(), three.end(), out);
+	cout << endl << "List one: ";
+	copy (one.begin(), one.end(), out);
+	three.unique();
+	cout << endl << "List three after unique: ";
+	copy (three.begin(), three.end(), out);
+	three.sort();
+	three.unique();
+	cout << endl << "List three after sort & unique: ";
+	copy (three.begin(), three.end(), out);
+	two.sort();
+	three.merge(two);
+	cout << endl << "Sorted two merged into three: ";
+	copy (three.begin(), three.end(), out);
+	cout << endl;
+
+	return 0;
+}

memb_pt.cpp

@@ -0,0 +1,77 @@
+// memb_pt.cpp -- dereferencing pointers to class members
+#include <iostream>
+using namespace std;
+
+class Example
+{
+private:
+	int feet;
+	int inches;
+public:
+	Example();
+	Example (int ft);
+	~Example();
+	void show_in()const;
+	void show_ft()const;
+	void use_ptr()const;
+};
+
+Example:: Example()
+{
+	feet = 0;
+	inches = 0;
+}
+
+Example:: Example (int ft)
+{
+	feet = ft;
+	inches = 12 * feet;
+}
+
+Example:: ~Example()
+{
+}
+
+void Example:: show_in()const
+{
+	cout << inches << " inches\n";
+}
+
+void Example:: show_ft()const
+{
+	cout << feet << " feet\n";
+}
+
+void Example:: use_ptr()const
+{
+	Example yard (3);
+	int Example:: *pt;
+	pt = &Example:: inches;
+	cout << "Set pt to &Example:: inches: \n";
+	cout << "this->pt: " << this->*pt << endl;
+	cout << "yard.*pt: " << yard.*pt << endl;
+	pt = &Example:: feet;
+	cout << "Set pt to &Example:: feet: \n";
+	cout << "this->pt: " << this->*pt << endl;
+	cout << "yard.*pt" << yard.*pt << endl;
+	void(Example:: *pf) ()const;
+	pf = &Example:: show_in;
+	cout << "Set pf to &Example:: show_in: \n";
+	cout << "Using (this->*pf) (): ";  // apply static member function
+	(this->*pf) ();
+	cout << "Using (yard.*pf) (): ";
+	(yard.*pf) ();
+}
+
+int main()
+{
+	Example car (15);
+	Example van (20);
+	Example garage;
+		cout << "car.use_ptr()output: \n";
+		car.use_ptr();
+		cout << "\nvan.use_ptr()output: \n";
+		van.use_ptr();
+
+		return 0;
+}

newplace.cpp

@@ -0,0 +1,78 @@
+/*
+	There are four methods to use new operation
+	#include <new>
+	struct chaff
+	{
+		char dross[20];
+		int slag;
+	};
+	char buffer1[50];
+	char buffer2[500];
+	int main()
+	{
+		chaff *p1, *p2;
+		int *p3, *p4;
+		// first, the reuglar forms of new
+		p1 = new chaff;					// place a structure in heap
+		p3 = new int[20];				// place int array in heap
+		// now, the two forms of placement new
+		p2 = new (buffer1) chaff;		// place structure in buffer1
+		p4 = new (buffer2) int[20]; 	// place int array in buffer2
+	}
+*/
+
+// newplace.cpp -- using placement new
+#include <iostream>
+#include <new>
+const int BUF = 512;
+const int N = 5;
+char buffer[BUF];
+int main()
+{
+	using namespace std;
+	double *pd1, *pd2;
+	int i;
+	cout << "Calling new and placement new:\n";
+	pd1 = new double[N];				// use heap
+	pd2 = new (buffer) double[N];		// use buffer array
+	for (i = 0; i< N; i++) {
+		pd2[i] = pd1[i] = 1000 + 20.0 * i;
+	}
+	cout << "Buffer addresses:\n" << " heap: " << pd1
+		<< " static: " << (void *) buffer << endl;
+	cout << "Buffer contents:\n";
+	for (i = 0; i < N; i++) {
+		cout << pd1[i] << " at " << &pd1[i] << "; ";
+		cout << pd2[i] << " at " << &pd2[i] << endl;
+	}
+
+	cout << "\nCalling new and placement new a second time:\n";
+	double *pd3, *pd4;
+	pd3 = new double[N];
+	pd4 = new (buffer) double[N];
+	for (i = 0; i < N; i++) {
+		pd4[i] = pd3[i] = 1000 + 20.0 * i;
+	}
+	cout << "Buffer contents:\n";
+	for (i = 0; i < N; i++) {
+		cout << pd3[i] << " at " << &pd3[i] << "; ";
+		cout << pd4[i] << " at " << &pd4[i] << endl;
+	}
+
+	cout << "\nCalling new and placement new a third time:\n";
+	delete [] pd1;
+	pd1 = new double[N];
+	pd2 = new (buffer + N * sizeof(double)) double[N];
+	for (i = 0; i < N; i++) {
+		pd2[i] = pd1[i] = 1000 + 20.0 * i;
+	}
+	cout << "Buffer contents:\n";
+	for (i = 0; i < N; i++) {
+		cout << pd1[i] << " at " << &pd1[i] << "; ";
+		cout << pd2[i] << " at " << &pd2[i] << endl;
+	}
+	delete [] pd1;
+	delete [] pd3;
+	
+	return 0;
+}

stfile.cpp

@@ -0,0 +1,27 @@
+// strfile.cpp -- read strings from a file
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <cstdlib>
+int main()
+{
+	using namespace std;
+	ifstream fin;
+	fin.open("tobuy.txt");
+	if (fin.is_open() == false) {
+		cerr << "Can't open file. Bye.\n";
+		exit(EXIT_FAILURE);
+	}
+	string item;
+	int count = 0;
+
+	getline(fin, item, ':');
+	while (fin) {
+		++count;
+		cout << count << ": " << item << endl;
+		getline(fin, item, ':');
+	}
+	cout << "Done\n";
+	fin.close();
+	return 0;
+}