Strings(Chapter 1 of Thinking in C++ Vol 2)
ichar_traits.h
1 #ifndef ICHAR_TRAITS_H
2 #define ICHAR_TRAITS_H
3 #include <string>
4 #include <cctype>
5
6 struct ichar_traits : std::char_traits<char>
7 {
8 static bool eq(char c1st, char c2nd)
9 {
10 return std::toupper(c1st) == std::toupper(c2nd);
11 }
12
13 static bool ne(char c1st, char c2nd)
14 {
15 return std::toupper(c1st) != std::toupper(c2nd);
16 }
17
18 static bool lt(char c1st, char c2nd)
19 {
20 return std::toupper(c1st) < std::toupper(c2nd);
21 }
22
23 static int compare(const char* str1, const char* str2, size_t n)
24 {
25 for(int i=0; i<n; i++)
26 {
27 if(std::tolower(*str1) > std::tolower(*str2))
28 {
29 return 1;
30 }
31 if(std::tolower(*str1) < std::tolower(*str2))
32 {
33 return -1;
34 }
35
36 if(*str1 == 0 || *str2 == 0)
37 {
38 return 0;
39 }
40 str1++;
41 str2++;
42 }
43 return 0;
44 }
45
46 static const char* find(const char* s1, int n, char c)
47 {
48 while(n-- > 0 && std::toupper(*s1) != std::toupper(c))
49 {
50 s1++;
51 }
52 return s1;
53 }
54 };
55
56 #endif
2 #define ICHAR_TRAITS_H
3 #include <string>
4 #include <cctype>
5
6 struct ichar_traits : std::char_traits<char>
7 {
8 static bool eq(char c1st, char c2nd)
9 {
10 return std::toupper(c1st) == std::toupper(c2nd);
11 }
12
13 static bool ne(char c1st, char c2nd)
14 {
15 return std::toupper(c1st) != std::toupper(c2nd);
16 }
17
18 static bool lt(char c1st, char c2nd)
19 {
20 return std::toupper(c1st) < std::toupper(c2nd);
21 }
22
23 static int compare(const char* str1, const char* str2, size_t n)
24 {
25 for(int i=0; i<n; i++)
26 {
27 if(std::tolower(*str1) > std::tolower(*str2))
28 {
29 return 1;
30 }
31 if(std::tolower(*str1) < std::tolower(*str2))
32 {
33 return -1;
34 }
35
36 if(*str1 == 0 || *str2 == 0)
37 {
38 return 0;
39 }
40 str1++;
41 str2++;
42 }
43 return 0;
44 }
45
46 static const char* find(const char* s1, int n, char c)
47 {
48 while(n-- > 0 && std::toupper(*s1) != std::toupper(c))
49 {
50 s1++;
51 }
52 return s1;
53 }
54 };
55
56 #endif
Main 1 #include "ichar_traits.h"
2 #include <string>
3 #include <iostream>
4 using namespace std;
5
6 typedef basic_string<char, ichar_traits, allocator<char> > istring;
7
8 int main()
9 {
10 istring first = "tHis";
11 istring second = "ThIs";
12 cout << first.compare(second) << endl;
13 cin.get();
14 }
2 #include <string>
3 #include <iostream>
4 using namespace std;
5
6 typedef basic_string<char, ichar_traits, allocator<char> > istring;
7
8 int main()
9 {
10 istring first = "tHis";
11 istring second = "ThIs";
12 cout << first.compare(second) << endl;
13 cin.get();
14 }
