typedef enum Letter_A
{
A,a
};
bool letter_a(char ch)
{
if(ch IS ELEMENT OF Letter_A)
{
return true;
}
return false;
}
Elements-Check??
Author
Ok, is there a way to do something like this?
Or would I have to check every element( if(ch == ''A'' || ch == ''a) ) ???
Thanks for any replies!
AngelForce
--
If you find any mistakes, you''re allowed to keep ''em!
''When I look back I am lost.''
What''s wrong with:
bool is_letter_a(char ch){ return (ch == ''a'' || ch == ''A'');} // or even...char upcase(char ch){ return (''a'' <= ch && ch <= ''z'') ? (ch - ''a'' + ''A'') : ch;} bool is_same_letter_ignoring_case(char ch1, char ch2){ return upcase(ch1) == upcase(ch2);} //testbool check = is_same_letter_ignoring_case(ch, ''a'');
enums are types. Treat ''em as such.
enum some_enum{ elem1, elem2, elem3, elem4};void some_function(some_enum a){ // blah}// ...some_enum arg = elem2;some_function(arg);// ... 
If your problem is mainly about character handling, use the toupper and tolower functions to convert a character so that you only have to compare against one case.
If your problem is about being able to find something in a set, you probably want std::set, although that requires you to use C++. (I say this because your typedef implies otherwise, even if it is pointless in the context).
std::set<char> letterA;
letterA.insert(''a'');
letterA.insert(''A'');
if (letterA.find(ch) != letterA.end()) return true; else return false;
Note that this example is convoluted, but it would save you a lot of typing (and potential errors) if the set contained a lot of elements.
[ MSVC Fixes | STL | SDL | Game AI | Sockets | C++ Faq Lite | Boost | Asking Questions | Organising code files | My stuff ]
If your problem is about being able to find something in a set, you probably want std::set, although that requires you to use C++. (I say this because your typedef implies otherwise, even if it is pointless in the context).
std::set<char> letterA;
letterA.insert(''a'');
letterA.insert(''A'');
if (letterA.find(ch) != letterA.end()) return true; else return false;
Note that this example is convoluted, but it would save you a lot of typing (and potential errors) if the set contained a lot of elements.
[ MSVC Fixes | STL | SDL | Game AI | Sockets | C++ Faq Lite | Boost | Asking Questions | Organising code files | My stuff ]
Author
Ok, I posted a bad example 
I just wanted to show the core of my question...please consider this:
(Ok, I am not sure, if all the enums would work, but I can at least compile it
)
So, how would you do such a check, when the typ can be (eg) char, int or string?
std::set sounds good, but I dunno how I would implement it in a situation like this.
Please shout very loud if you don't understand my babbling, I'll try then to formulate it better(heck, English is kind of pain =) ).
__EDIT__
I do use C++ but 'typedef enum' sounds better than 'enum'
_/EDIT__
AngelForce
--
If you find any mistakes, you're allowed to keep 'em!
'When I look back I am lost.'
[edited by - AngelForce on October 24, 2002 4:51:10 AM]
I just wanted to show the core of my question...please consider this:
typedef enum typ1{ A = 'A', a = 'a'};typedef enum typ2{ _A = 1, _B = 4, _C = 35, _D = 156};typedef enum typ3{ __A = "text1", __B = "text2"};typedef enum typ4{ typ1,typ2,typ3};int test(typ4 tt){ if(tt IS ELEMENT OF typ1) return 1; else if(tt IS ELEMENT OF typ2) return 2; return 3;} (Ok, I am not sure, if all the enums would work, but I can at least compile it
)So, how would you do such a check, when the typ can be (eg) char, int or string?
std::set sounds good, but I dunno how I would implement it in a situation like this.
Please shout very loud if you don't understand my babbling, I'll try then to formulate it better(heck, English is kind of pain =) ).
__EDIT__
I do use C++ but 'typedef enum' sounds better than 'enum'
_/EDIT__
AngelForce
--
If you find any mistakes, you're allowed to keep 'em!
'When I look back I am lost.'
[edited by - AngelForce on October 24, 2002 4:51:10 AM]
You can''t.
Well, you can... but it''s basically just testing against each element of the enum separately.
Enums are meant to allow a programmer to easily refer to distinct but related integral constants by symbolic names. Think of them as special-purpose #defines. Since they don''t actually exist in your compiled code (the compiler just replaces them with their integral value) they aren''t actually a collection you can test against.
Don''t listen to me. I''ve had too much coffee.
Well, you can... but it''s basically just testing against each element of the enum separately.
Enums are meant to allow a programmer to easily refer to distinct but related integral constants by symbolic names. Think of them as special-purpose #defines. Since they don''t actually exist in your compiled code (the compiler just replaces them with their integral value) they aren''t actually a collection you can test against.
Don''t listen to me. I''ve had too much coffee.
Author
quote:Original post by Sneftel
You can''t.
Well, you can... but it''s basically just testing against each element of the enum separately.
Enums are meant to allow a programmer to easily refer to distinct but related integral constants by symbolic names. Think of them as special-purpose #defines. Since they don''t actually exist in your compiled code (the compiler just replaces them with their integral value) they aren''t actually a collection you can test against.
Don''t listen to me. I''ve had too much coffee.
Thanks! That''s the answer I wanted(even it''s sad that I can''t do it
)
This topic is closed to new replies.
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