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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 · The deferred block takes no parameters, but captures the entire scope by reference. Lambdas with captures can't implicitly convert to, say, void(*)(), since the capture necessitates storage.
Apr 30, 2015 · DEFER(A)() // cursor starts at the head of the sequence ^ // identifies call to DEFER - push current position DEFER( A )() // attempt to expand the argument (nothing to do) ^ // replace occurrences of id in DEFER with A, // then replace the call to it with the substituted body A EMPTY() // pop cursor position (start of pasted subsequence) ^ // doesn't find an expansion for A, move on A EMPTY() // move to next token ^ // EMPTY() is a valid expansion A () // replace EMPTY() with its body in ...
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.
In short: it is a smart pointers in C question. Reason: embedded programming and need to ensure that if complex algorithm is used, then proper deallocation occurs with little effort on the developer
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 16, 2016 · #define N_ 0 #define N_X 1 #define M(a) N_ M(arg)X; // #1 -- I'd like this to expand to N_X, and ultimately 1; but it's 0X instead M(arg); // #2 -- this should and does expand to 0 The problem with #1 is that after expanding M(), the result contains N_, and before concatenating it with X, the preprocessor finds and expands it. Can I somehow ...
Mar 17, 2009 · The __COUNTER__ symbol is provided by VC++ and GCC, and gives an increasing non-negative integral value each time it is used. I'm interested to learn whether anyone's ever used it, and whether it's
Feb 5, 2011 · Today I read about the defer statement in the Go language: A defer statement pushes a function call onto a list. The list of saved calls is executed after the surrounding function returns. Defer is commonly used to simplify functions that perform various clean-up actions.
May 9, 2018 · If you want to implement a while loop, you will need to use recursion in the preprocessor. The easiest way to do recursion is to use a deferred expression.
