char to store < 255 or use int
-
hi , this is about memory/speed size optim. take this for example: const int cAIMessageRouter_Init_ReserveRegisteredObjectCount = 64; const int cAIMessageRouter_Init_ReserveDelayedMessagesCount = 16; if i replace the int with a char or short.... what would be better.... Size does matter becouse every BIT send to the server .......... How smaller the player data, how faster the server can respond. But i dont know this: is const char value=12; FASTER then const short value=12; const int value=12; or slower?
-
hi , this is about memory/speed size optim. take this for example: const int cAIMessageRouter_Init_ReserveRegisteredObjectCount = 64; const int cAIMessageRouter_Init_ReserveDelayedMessagesCount = 16; if i replace the int with a char or short.... what would be better.... Size does matter becouse every BIT send to the server .......... How smaller the player data, how faster the server can respond. But i dont know this: is const char value=12; FASTER then const short value=12; const int value=12; or slower?
-
Try it out yourself by using sizeof and passing each of those items. example:
cout << "Size of an integer: " << sizeof(int) << endl;if i do sizeof(int) i get 32 or 16. With a char i get 8 :-) But if i use a char to hold a integer value of 5, wouldn`t that be slower? becouse chars are mainly used for strings.
-
if i do sizeof(int) i get 32 or 16. With a char i get 8 :-) But if i use a char to hold a integer value of 5, wouldn`t that be slower? becouse chars are mainly used for strings.
Characters are represented by a numeric value. It is that value that is stored in your variable not the letter itself, for chars these are the ASCII values. So its just as fast to use a number as it is to use a letter.
-
if i do sizeof(int) i get 32 or 16. With a char i get 8 :-) But if i use a char to hold a integer value of 5, wouldn`t that be slower? becouse chars are mainly used for strings.
oversight-[project-zero] wrote:
chars are mainly used for strings.
Not exactly true. Char's are used for lots of things, including pure data manipulation. It's simply 2 bytes which can be interpreted as an ANSII character. That said, if you're only going to be holding very small numbers like 5 and you're EXTREMELY worried about space/efficiency, you should use BYTE for values which you know will be less than 16. I'm not sure how much time this will all save you to be honest, these types of issues are normally only a passing thought in designing your application because there are so many more design issues that would likely speed up your program much more.
-
Characters are represented by a numeric value. It is that value that is stored in your variable not the letter itself, for chars these are the ASCII values. So its just as fast to use a number as it is to use a letter.
Thanx. The game (soldner secret wars) i am working on (mainly patches) has many data like: const int max_sounds=5; by using this: const char max_sounds=5; i can optimize SIZE, becouse 20 classes uses 1 class for work that has this defined. or am i wrong? cu
-
oversight-[project-zero] wrote:
chars are mainly used for strings.
Not exactly true. Char's are used for lots of things, including pure data manipulation. It's simply 2 bytes which can be interpreted as an ANSII character. That said, if you're only going to be holding very small numbers like 5 and you're EXTREMELY worried about space/efficiency, you should use BYTE for values which you know will be less than 16. I'm not sure how much time this will all save you to be honest, these types of issues are normally only a passing thought in designing your application because there are so many more design issues that would likely speed up your program much more.
thanx, at this moment we have still (mod-team) status... and i am the only c/c++ coder. This forum is a great help. (talks are going on about soldner 2 www.secretwars.net= www.soldner.jowood.com) You might wonder why this game source is so complicated ;-) lol. (i hate wings !!!, crappy coders!!!!) i can use a few helping hands making soldner a better game, if you are interested..... The source is like this: dynamics,core etc is defined in classes, DEEP polymorpish and derived stuff. (just defined..... no value`s in c++) The xml and python is used to define the game property`s. Thats called the gdb::xxxxx (game database). The gdb is implemented in c/c++ but called from python and xml. :-) becouse of this complexity, i am seeking for talented coders. At our team talks are going on about a contract with jowood. We where/are a mod team, but i think thats changing rapidly. Jowood needs project zero, without project zero NO soldner. Cu at the soldner battlefield.
-
if i do sizeof(int) i get 32 or 16. With a char i get 8 :-) But if i use a char to hold a integer value of 5, wouldn`t that be slower? becouse chars are mainly used for strings.
oversight-[project-zero] wrote:
becouse chars are mainly used for strings.
what's that crap ?
charis an integer in C/C++, and its name is quite bad as beginners make too much confusion... acharis only a 8 bits integer. in C/C++, there's no high level type for strings. strings are simply char arrays, ended with acharwhose value is0. never using acharwill slow down your application compared to anintfor such a use... however, you'll have to consider the values stored within...charis a signed type, so stored values between-128and127. if you want values from0to255, useunsigned char. and if you want more, useshort,int(size is dependant of the plateform ; can be 8, 12, 32 or 64 bits !!! be careful !),long...
TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0] -
oversight-[project-zero] wrote:
chars are mainly used for strings.
Not exactly true. Char's are used for lots of things, including pure data manipulation. It's simply 2 bytes which can be interpreted as an ANSII character. That said, if you're only going to be holding very small numbers like 5 and you're EXTREMELY worried about space/efficiency, you should use BYTE for values which you know will be less than 16. I'm not sure how much time this will all save you to be honest, these types of issues are normally only a passing thought in designing your application because there are so many more design issues that would likely speed up your program much more.
tansey4 wrote:
It's simply 2 bytes
false. a
charis 8 bits wide, so only 1 byte !!!!!!
TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0] -
oversight-[project-zero] wrote:
becouse chars are mainly used for strings.
what's that crap ?
charis an integer in C/C++, and its name is quite bad as beginners make too much confusion... acharis only a 8 bits integer. in C/C++, there's no high level type for strings. strings are simply char arrays, ended with acharwhose value is0. never using acharwill slow down your application compared to anintfor such a use... however, you'll have to consider the values stored within...charis a signed type, so stored values between-128and127. if you want values from0to255, useunsigned char. and if you want more, useshort,int(size is dependant of the plateform ; can be 8, 12, 32 or 64 bits !!! be careful !),long...
TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]It is not so that using integers (32 bits) will slow your applications compared to using chars (signed or not of importance since 8 bit is 8 bit). In game development speed is everything and a 32 bit CPU processes 32 bit values quicker then 8 bit values. So using an int is faster then a char.