overcomp.cpp
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上传日期:2022-06-29
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书籍源码
开发平台:
Visual C++
- /*
- * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.
- * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the
- * copyright and warranty notices given in that book:
- *
- * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."
- *
- *
- * "The authors and publisher have taken care in the preparation of this book,
- * but make no expressed or implied warranty of any kind and assume no
- * responsibility for errors or omissions. No liability is assumed for
- * incidental or consequential damages in connection with or arising out of the
- * use of the information or programs contained herein."
- *
- * Permission is granted for this code to be used for educational purposes in
- * association with the book, given proper citation if and when posted or
- * reproduced.Any commercial use of this code requires the explicit written
- * permission of the publisher, Addison-Wesley Professional, a division of
- * Pearson Education, Inc. Send your request for permission, stating clearly
- * what code you would like to use, and in what specific way, to the following
- * address:
- *
- * Pearson Education, Inc.
- * Rights and Contracts Department
- * 75 Arlington Street, Suite 300
- * Boston, MA 02216
- * Fax: (617) 848-7047
- */
- #include <vector>
- using std:: vector;
- #include <iostream>
- using std::cout; using std::endl;
- #include <string>
- using std::string;
- // implement strcmp-like generic compare function
- template <typename T> int compare2(T, T);
- template <typename T> int compare2(T v1, T v2)
- {
- // as before
- cout << "compare2(T, T)" << endl;
- if (v1 < v2) return -1;
- if (v2 < v1) return 1;
- return 0;
- }
- // plain functions to handle C-style character strings
- int compare2(const char* v1, const char* v2)
- {
- cout << "compare2(const char*, const char*)" << endl;
- return strcmp(v1, v2);
- }
- // compares two objects
- template <typename T> int compare(const T&, const T&);
- // compares elements in two sequences
- template <class U, class V> int compare(U, U, V);
- // plain functions to handle C-style character strings
- int compare(const char*, const char*);
- // compares two objects
- template <typename T> int compare(const T &v1, const T &v2)
- {
- cout << "compare(const T&, const T&)" << endl;
- if (v1 < v2) return -1;
- if (v2 < v1) return 1;
- return 0;
- }
- // compares elements in two sequences
- template <class U, class V> int compare(U beg1, U end1, V beg2)
- {
- cout << "compare(U, U, V)" << endl;
- while (beg1 != end1) {
- if (*beg1 < *beg2) return -1;
- if (*beg2 < *beg1) return 1;
- ++beg1; ++beg2;
- }
- return 0; // if we got here, the two sequences are equal
- }
- // plain functions to handle C-style character strings
- int compare(const char* v1, const char* v2)
- {
- cout << "compare(const char*, const char*)" << endl;
- return strcmp(v1, v2);
- }
- int main()
- {
- cout << "calling compare(1, 0);" << endl;
- // calls compare(const T&, const T&) with T bound to int
- compare(1, 0);
- cout << "ncalling compare(vector iters);" << endl;
- // calls compare(U, U, V), with U and V bound to vector<int>::iterator
- vector<int> ivec1(10), ivec2(20);
- compare(ivec1.begin(), ivec1.end(), ivec2.begin());
- int ia1[] = {0,1,2,3,4,5,6,7,8,9};
- // calls compare(U, U, V) with U bound to int*
- // and V bound to vector<int>::iterator
- compare(ia1, ia1 + 10, ivec1.begin());
- cout << "ncalling compare(const_arr1, const_arr2);" << endl;
- // calls the ordinary function taking const char* parameters
- const char const_arr1[] = "world", const_arr2[] = "hi";
- compare(const_arr1, const_arr2);
- cout << "ncalling compare(s1, s2);" << endl;
- // calls compare(const T&,const T&) with T bound to string
- string s1 = "hi", s2 = "world";
- compare(s1, s2);
- cout << "ncalling compare(ch_arr1, ch_arr2);" << endl;
- // calls the ordinary function taking const char* parameters
- char ch_arr1[] = "world", ch_arr2[] = "hi";
- compare(ch_arr1, ch_arr2);
- cout << "ncalling compare(p1, p2);" << endl;
- char *p1 = ch_arr1, *p2 = ch_arr2;
- compare(p1, p2);
- cout << "ncalling compare(ch_arr1, const_arr1);" << endl;
- cout << "calling compare(ch_arr2, const_arr1);" << endl;
- cout << "calling compare(0, 0);" << endl;
- compare(ch_arr1, const_arr1);
- compare(ch_arr2, const_arr2);
- compare(0, 0);
- cout << "ncalling compare2(ch_arr1, ch_arr2);" << endl;
- cout << "calling compare2(p1, p2);" << endl;
- cout << "calling compare(const_arr1, const_arr2);" << endl;
- cout << "calling compare(cp1, cp2);" << endl;
- // calls compare2(T, T) with T bound to char*
- compare2(ch_arr1, ch_arr2);
- // calls compare2(T, T) with T bound to char*
- compare2(p1, p2);
- // calls the ordinary function taking const char* parameters
- compare2(const_arr1, const_arr2);
- const char *cp1 = const_arr1, *cp2 = const_arr2;
- // calls the ordinary function taking const char* parameters
- compare2(cp1, cp2);
- return 0;
- }