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- Dictionaryavoid/əˈvɔɪd/
verb
- 1. keep away from or stop oneself from doing (something): "avoid excessive exposure to the sun" Similar Opposite
- 2. repudiate, nullify, or render void (a decree or contract): "if the original owner had avoided his contract with the rogue, ownership of the goods would have reverted to him"
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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. But both have wide area of applications which ...
Oct 27, 2013 · It replaces all instances of the defined keyword into something else before the code is being processed. const on the other hand is variable whose value cannot be changed midway during runtime. The only reason I can think of using const is if the value relies on other variables. For example: #define PI 3.14159f. #define RADIUS 3.0f.
May 15, 2011 · Most compilers will allow you to define a macro from the command line (e.g. g++ -DDEBUG something.cpp), but you can also just put a define in your code like so: #define DEBUG Some resources: Wikipedia article; C++ specific site; Documentation on GCC's preprocessor; Microsoft reference; C specific site (I don't think it's different from the C++ ...
Dec 17, 2014 · So #define NOMINMAX is telling the compiler (or actually the preprocessor) to skip over the definitions of min and max, but it will only apply if you do it before you #include "windows.h". In the code of the question, #define NOMINMAX does appear before #include <Windows.h>.
Nov 27, 2015 · The #define directive has two common uses. The first one, is control how the compiler will act. To do this, we also need #undef, #ifdef and #ifndef. (and #endif too...) You can make "compiler logic" this way. A common use is to activate or not a debug portion of the code, like that: #ifdef DEBUG. //debug code here.
Aug 29, 2008 · A race condition occurs when two or more threads can access shared data and they try to change it at the same time. Because the thread scheduling algorithm can swap between threads at any time, you don't know the order in which the threads will attempt to access the shared data. Therefore, the result of the change in data is dependent on the ...
5. If it's C++, you should use the C++ Standard Library's std::string. It's much more clear than a preprocessor macro, it will have a single location in memory when it's defined, and it has all the extra functionality of std::string instead of only pointer comparisons as is the case with the implicit const char* that are created with a ...
Jan 4, 2014 · In main.c, replace #include "test.c" by #include "test.h". A last point: with your programs being more complex, you will be faced to situations when header files may be included several times. To prevent this, header sources are sometimes enclosed by specific macro definitions, like: #ifndef TEST_H_INCLUDED.
Jan 24, 2016 · If not, it will define FILE_H and continue processing the code between it and the #endif directive. The next time that file's contents are seen by the preprocessor, the check against FILE_H will be false, so it will immediately scan down to the #endif and continue after it. This prevents redefinition errors.
Jul 25, 2019 · 3. #ifndef checks whether the given token has been #defined earlier in the file or in an included file; if not, it includes the code between it and the closing #else or, if no #else is present, #endif statement. #ifndef is often used to make header files idempotent by defining a token once the file has been included and checking that the token ...
