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- Dictionaryversus/ˈvəːsəs/
preposition
- 1. against (especially in sporting and legal use): "England versus Australia"
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Dec 20, 2023 · Delta_G December 21, 2023, 3:21pm 19. b707: The applications of the #define are much broader than just defining constants; a definition can contain operators and entire procedures. But the question was about assigning pin numbers. That's a case where you don't need constexpr or #define.
Oct 28, 2009 · Two special cases (1) static const is preferred within a class scope for class specific constants; (2) namespace or anonymous scope const is preferred over #define. I prefer Enums. Because it is hybrid of both. Doesn't occupy space unless you create a variable of it.
Feb 12, 2021 · 2. #define directives create macro substitution, while constexpr variables are special type of variables. They literally have nothing in common beside the fact that before constexpr (or even const) variables were available, macros were sometimes used when currently constexpr variable can be used.
Dec 22, 2009 · 17. Constants allow you to specify a datatype, which is (usually) an advantage. Macros are much more flexible, and therefore can get you into much more trouble if you're not careful. Best practice is to use constants as much as possible, and use #define only when you really need a macro, not just a named literal value.
The difference is that #define is processed by the preprocessor doing what amounts to simple text replacement. Const values defined like this are not visible for the actual compiler, while a variable defined with the const modifier is an actual typed "variable" (well not really that variable). The disadvantage of #define is that is replaces ...
Sep 22, 2008 · Ah, yes: remove the static keyword. static is deprecated in C++ when used as you do, and if uint8 is a buildin type, you won't need this to declare this in an header included by multiple sources of the same module. In the end, the code should be: namespace RecordType {. const uint8 xNew = 1; const uint8 xDeleted = 2;
Nov 3, 2009 · 2. No. typedef is a C keyword that creates an alias for a type. #define is a pre-processor instruction, that creates a text replacement event prior to compilation. When the compiler gets to the code, the original "#defined" word is no longer there. #define is mostly used for macros and global constants.
Sep 11, 2009 · 2. Declaration is for the compiler to accept a name (to tell the compiler that the name is legal, the name is introduced with intention not a typo). Definition is where a name and its content is associated. The definition is used by the linker to link a name reference to the content of the name.
Jun 14, 2010 · 1. Enum: 1. Generally used for multiple values. 2. In enum there are two thing one is name and another is value of name name must be distinguished but value can be same.If we not define value then first value of enum name is 0 second value is 1,and so on, unless explicitly value are specified. 3.
Nov 4, 2009 · 811. It depends on what you need the value for. You (and everyone else so far) omitted the third alternative: static const int var = 5; #define var 5. enum { var = 5 }; Ignoring issues about the choice of name, then: If you need to pass a pointer around, you must use (1). Since (2) is apparently an option, you don't need to pass pointers around.
