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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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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++ ...
Nov 27, 2015 · The most common use (by far) of #define is for include guards: // header.hh #ifndef HEADER_HH_ #define HEADER_HH_ namespace pony { // ... } #endif Another common use of #define is in creating a configuration file, commonly a config.h file, where we #define macros based on various states and conditions.
Feb 12, 2021 · Statements defined using #define are called macros. And macros are used in a multitude of uses. We can use them to conditionally compile sections of code. #ifdef ONE int AddOne(int x) { return x + 1; } #else int AddTwo(int x) { return x + 2; } #endif When we don't need to store constants in a variable. #define MAX_BOUND 1000 #define MIN_BOUND 10
Mar 5, 2013 · In the use of constants the two answers above are correct, however #define is not limited to that use alone. Another example of the use of #define is macros. Macros. Macros are preprocessor-utilised pieces of code, and they work exactly like other #define declarations in that regard. The preprocessor will literally swap out the occurrence of ...
Jan 4, 2014 · You actually compile the source code of test.c twice:. The first time when compiling test.c itself,; The second time when compiling main.c which includes all the test.c source.
The cost of opening a file, discarding all its contents, and closing it over and over might not sound like much, but for a large header included transitively by hundreds of other headers (e.g. windows.h, the low-level stuff providing simple type definitions like stdint.h, types.h, etc.), the difference between opening it exactly once per source file and opening it a hundred times (where only the first time does anything productive), especially in a parallel build (where even the tiny amount ...
Sep 28, 2012 · What is the correct strategy to limit the scope of #define and avoid unwarrented token collisions. Avoid macros unless they are truly necessary. In C++, constant variables and inline functions can usually be used instead. They have the advantage that they are typed, and can be scoped within a namespace, class, or code block.
C++17 Update. In C++17 we gain the attribute [[maybe_unused]] which is covered in [dcl.attr.unused]. The attribute-token maybe_unused indicates that a name or entity is possibly intentionally unused.
Aug 29, 2008 · A "race condition" exists when multithreaded (or otherwise parallel) code that would access a shared resource could do so in such a way as to cause unexpected results.
When I try to execute this statement in Oracle SQL Developer 2.1 a dialog box "Enter Substitution Variable" pops up asking for a replacement value for TOBAGO, update t set country = 'Trinidad and ...
