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- Dictionarybetter/ˈbɛtə/
adjective
- 1. more desirable, satisfactory, or effective: "we're hoping for better weather tomorrow" Similar Opposite
- 2. partly or fully recovered from illness, injury, or mental stress: "his leg was getting better" Similar Opposite
adverb
- 1. more excellently or effectively: "Jonathon could do better if he tried" Similar
noun
- 1. the better one; that which is better: "the Natural History Museum book is by far the better of the two"
- 2. one's superiors in social class or ability: dated, humorous "I'm not one to speak ill of my betters"
verb
- 1. improve on or surpass (an existing or previous level or achievement): "his account can hardly be bettered" Similar
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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.
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 ...
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.
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.
Dec 29, 2013 · enum is compile time constant with debug info with no storage allocation. const is allocated with a storage, depending on whether it is optimised away by the compiler with constant propagation. #define has no storage allocation. edited Sep 2, 2013 at 11:24. nhahtdh.
Mar 4, 2017 · For example: #define SCALE 1. ... scaled_x = x * SCALE; When SCALE is defined as 1 the compiler can eliminate the multiplication as it knows that x * 1 == x, but if SCALE is an (extern) const, it will need to generate code to fetch the value and perform the multiplication because the value will not be known until the linking stage. (extern is ...
Jun 14, 2010 · #define is a preprocessor command, enum is in the C or C++ language. It is always better to use enums over #define for this kind of cases. One thing is type safety. Another one is that when you have a sequence of values you only have to give the beginning of the sequence in the enum, the other values get consecutive values.
Jun 29, 2010 · #define ignores scoping, but allows you to use better typing facilities: lets you choose the constant type (either by using suffixes or by including an explicit cast into the definition). So, choose for yourself what is more important to you. For a state machine, enum might be a better choice, unless you have a good reason to control the type.
Jan 6, 2016 · edit. I know what can and what cannot be done with constexpr over macros which is what most of that question and its answers are all about. Here I'm explicitly asking what are the benefits of using constexpr over #define when BOTH can be used. Short answer: Type safety (0 will be an int, not potentially NULL pointer).
Nov 14, 2012 · 1) No. 2) A Macro in C is simply text that is expanded before the compiler processes the source code. The inline keyword is used as a hint to the compiler that the function can be placed inline without the need for a call-stack to be set up. So, for example, lets say that you got the following two snippets of code (First the macro and then the ...
