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Waiting until two async blocks are executed before starting another block
When using GCD, we want to wait until two async blocks are executed and done before moving on to the next steps of execution. What is the best way to do that?
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How do you cast a List of supertypes to a List of subtypes?
...almost works; but it doesn't work because you can't cast a generic type of one parameter to another. However, you can cast through an intermediate wildcard type and it will be allowed (since you can cast to and from wildcard types, just with an unchecked warning):
List<TestB> variable = (List...
How to define optional methods in Swift protocol?
...rm to such protocol. It's always either concrete implementation or default one. This is how "interfaces" or "contracts" behave in other languages.
Disadvantages
For non-Void requirements, you need to have a reasonable default value, which is not always possible. However, when you encounter this ...
Is it better to use C void arguments “void foo(void)” or not “void foo()”? [duplicate]
... feature in C99. I think the only confusion here has arisen because I mentioned that vararg lists are unsafe immediately after discussing empty parameter lists. This was simply because I imagine someone reading the explanation and then thinking "Oh, I wonder what amazing things I can achieve with th...
How can I disable ARC for a single file in a project?
...e 4, in build phases, and compile sources, there are actually two columns. One for the file name, and another for the compile flags for that one file. This is where you enter this specific compiler flag.
– casademora
Jul 26 '11 at 17:58
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What is Node.js' Connect, Express and “middleware”?
...rojects in Node.js ecosystem do. Is it something like Rails' Rack? Can someone please explain?
8 Answers
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C/C++ check if one bit is set in, i.e. int variable
Is there such a way to check if bit 3 in temp is 1 or 0 without bit shifting and masking.
21 Answers
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What is __stdcall?
...and it must not be confused with _standard_call in that it is standard-c ! one might think that would be the point of __stdcall if one doesnt know better
– Johannes Schaub - litb
Nov 18 '08 at 2:38
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What is the difference between “#!/usr/bin/env bash” and “#!/usr/bin/bash”?
...ons on different systems. As long as it's in your path, it will find it.
One downside is that you will be unable to pass more than one argument (e.g. you will be unable to write /usr/bin/env awk -f) if you wish to support Linux, as POSIX is vague on how the line is to be interpreted, and Linux int...
Best Practice: Initialize JUnit class fields in setUp() or at declaration?
...eption, testEmptyCollection, and the like. The perspective there is of someone writing a class and making sure it works right.
You should probably do the same when testing your own classes: create your object in setUp or in a test method, so that you'll be able to get reasonable output if you break...