C++ Cookbook

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C++ Cookbook
Solutions and Examples for C++ Programmers

Book Description The C++ Cookbook will make your path to mastery much shorter. This practical, problem-solving guide is ideal if you're an engineer, programmer, or researcher writing an application for one of the legions of platforms on which C++ runs. The algorithms provided in C++ Cookbook will jump-start your development by giving you some basicbuilding blocks that you don't have to develop on your own. Less a tutorial than a problem-solver, the book addresses many of the most common problems you're likely encounter--whether you've beenprogramming in C++ for years or you're relatively new to the language. Book Details Publisher: O'Reilly Media By: D. Ryan Stephens, Christopher Diggins,Jonathan Turkanis, Jeff Cogswell ISBN: 978-0-59600-761-4 Year: 2005 Pages: 594 Language: English File size: 3.9 MB File format: PDF eBook Download: 本帖隐藏的内容 C++ Cookbook

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关键词：Cookbook Book Cook COO Programming practical provided develop shorter writing

1. Example 3-1. Converting number strings to numbers
   
2. #include <iostream>
   
3. #include <string>
   
4. #include <cstdlib>
   
5. 
   
6. using namespace std;
   
7. 
   
8. long hex2int(const string& hexStr) {
   
9.    char *offset;
   
10.    if (hexStr.length() > 2) {
    
11.       if (hexStr[0] == '0' && hexStr[1] == 'x') {
    
12.          return strtol(hexStr.c_str(), &offset, 0);
    
13.       }
    
14.    }
    
15.    return strtol(hexStr.c_str(), &offset, 16);
    
16. }
    
17. 
    
18. int main() {
    
19.    string str1 = "0x12AB";
    
20.    cout << hex2int(str1) << endl;
    
21.    string str2 = "12AB";
    
22.    cout << hex2int(str2) << endl;
    
23.    string str3 = "QAFG";
    
24.    cout << hex2int(str3) << endl;
    
25. }

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1. Example 3-2. Using lexical_cast
   
2. #include <iostream>
   
3. #include <string>
   
4. #include <boost/lexical_cast.hpp>
   
5. 
   
6. using namespace std;
   
7. 
   
8. int main() {
   
9.    string str1 = "750";
   
10.    string str2 = "2.71";
    
11.    string str3 = "0x7FFF";
    
12.    try {
    
13.       cout << boost::lexical_cast<int>(str1) << endl;
    
14.       cout << boost::lexical_cast<double>(str2) << endl;
    
15.       cout << boost::lexical_cast<int>(str3) << endl;
    
16.    }
    
17.    catch (boost::bad_lexical_cast& e) {
    
18.       cerr << "Bad cast: " << e.what() << endl;
    
19.    }
    
20. }

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1. Example 3-3. Formatting a number as a string
   
2. #include <iostream>
   
3. #include <iomanip>
   
4. #include <string>
   
5. #include <sstream>
   
6. 
   
7. using namespace std;
   
8. 
   
9. int main() {
   
10. 
    
11.    stringstream ss;
    
12. 
    
13.    ss << "There are " << 9 << " apples in my cart.";
    
14.    cout << ss.str() << endl;  // stringstream::str() returns a string
    
15.                               // with the contents
    
16. 
    
17.    ss.str("");                   // Empty the string
    
18.    ss << showbase << hex << 16;  // Show the base in hexadecimal
    
19.    cout << "ss = " << ss.str() << endl;
    
20. 
    
21.    ss.str("");
    
22.    ss << 3.14;
    
23.    cout << "ss = " << ss.str() << endl;
    
24. }

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1. Example 3-4. Formatting integers as hexadecimal
   
2. #include <iostream>
   
3. #include <boost/format.hpp>
   
4. 
   
5. using namespace std;
   
6. using boost::format;
   
7. using boost::io::str;
   
8. using boost::io::format_error;
   
9. 
   
10. int main() {
    
11. 
    
12.    try {
    
13.       format f("There are %1% ways %2% %3% %4%");
    
14. 
    
15.       f % 3;
    
16.       f % "to" % "do" % "this.";
    
17. 
    
18.       cout << f << endl;
    
19. 
    
20.       f.clear(); // Clear buffers to format something else
    
21. 
    
22.       f.parse("Those cost $%d.");
    
23.       f % 50;
    
24. 
    
25.       cout << f << endl;
    
26. 
    
27.       int x = 11256099;
    
28. 
    
29.       string strx = str(format("%x") % x);
    
30.       cout << strx << endl;
    
31.    }
    
32.    catch (format_error &e) {
    
33.       cout << e.what() << endl;
    
34.    }
    
35. }

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1. Example 3-5. Validating a string number
   
2. #include <iostream>
   
3. #include <boost/lexical_cast.hpp>
   
4. 
   
5. using namespace std;
   
6. using boost::lexical_cast;
   
7. using boost::bad_lexical_cast;
   
8. 
   
9. template<typename T>
   
10. bool isValid(const string& num) {
    
11. 
    
12.    bool res = true;
    
13. 
    
14.    try {
    
15.       T tmp = lexical_cast<T>(num);
    
16.    }
    
17.    catch (bad_lexical_cast &e) {
    
18.       res = false;
    
19.    }
    
20. 
    
21.    return(res);
    
22. }
    
23. 
    
24. void test(const string& s) {
    
25. 
    
26.    if (isValid<int>(s))
    
27.       cout << s << " is a valid integer." << endl;
    
28.    else
    
29.       cout << s << " is NOT a valid integer." << endl;
    
30. 
    
31.    if (isValid<double>(s))
    
32.       cout << s << " is a valid double." << endl;
    
33.    else
    
34.       cout << s << " is NOT a valid double." << endl;
    
35. 
    
36.    if (isValid<float>(s))
    
37.       cout << s << " is a valid float." << endl;
    
38.    else
    
39.       cout << s << " is NOT a valid float." << endl;
    
40. }
    
41. 
    
42. int main() {
    
43. 
    
44.    test("12345");
    
45.    test("1.23456");
    
46.    test("-1.23456");
    
47.    test(" - 1.23456");
    
48.    test("+1.23456");
    
49.    test("  1.23456  ");
    
50.    test("asdf");
    
51. }

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