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- Dictionarydefer/dɪˈfəː/
verb
- 1. put off (an action or event) to a later time; postpone: "they deferred the decision until February"
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Sep 7, 2015 · This implementation is zero-overhead unlike some other answers, as well as syntactically nicer and easier to use. It also has zero dependencies, reducing compile times. You can paste this snippet anywhere in your codebase and it will just work. #ifndef defer. struct defer_dummy {}; template <class F> struct deferrer { F f; ~deferrer() { f(); } };
Apr 30, 2015 · 1. Note that on step 4, the preprocessor doesn't look backward: if say you have a macro that expands to () it doesn't look back to see if there was a macro name preceding this invocation. That's what makes DEFER work. Step #1 (fully replace each argument in isolation) makes EXPAND work. – Igor Tandetnik.
Jul 1, 2023 · #define DEFER(cleanup) for (_Bool done_ = 0; !done_; (cleanup), done_ = 1) That defers evaluation of the expression given by the argument to DEFER until after completion of the next statement, which can be, but does not need to be, a compound one.
162. The real answer is: Because you cannot trust defer. In concept, defer and async differ as follows: async allows the script to be downloaded in the background without blocking. Then, the moment it finishes downloading, rendering is blocked and that script executes. Render resumes when the script has executed.
1. C does not have destructors (unless you think of the GCC specific variable attribute cleanup, which is weird and rarely used; notice also that the GCC function attribute destructor is not what other languages, C++ notably, call destructor). C++ have them. And C & C++ are very different languages.
Mar 17, 2021 · It seems to me that this defer is essentially doing the same thing as RAII, but much neater and more intuitively. What is the difference, and do you see any problems with using these defer implementations instead? I don't really understand what the #define part does on these implementations above. What is the difference between the two and is ...
Sep 26, 2021 · In this Modern C video there's a trick that allows to postpone execution of a code until the block/scope exits. It's used as follows: int main() { int foo=0, bar; const char *etc = "Some
Mar 17, 2009 · Jul 3, 2013 at 22:38. 1. If you invoke the macro more than once, you need each typedef to be unique. If __COUNTER__ is not available, the failover is to use __LINE__, but that will fail of you have the bad luck of using the macro on the same line in two different source files. – EBlake.
May 17, 2016 · Use lazy initialization to defer the creation of a large or resource-intensive object, or the execution of a resource-intensive task, particularly when such creation or execution might not occur during the lifetime of the program. Since you have mentioned Expensive Process, why not encapsulate the expensive process in a Type ?
Note that in both cases, the defer statement ends with a parameter list, but in the first case, it's empty. If we had passed time.Since(start) as a parameter, it would be evaluated when the defer statement was evaluated.
