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Message Queue vs Message Bus — what are the differences?
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By and large, when it comes to vendor software products, they are used interchangeably, and do not have the strong distinctions in terms of push or pull as you describe.
The BUS vs. QUEUE is indeed somewhat a legacy concept,...
How do I erase an element from std::vector by index?
...ter to i position, so instead we can access the pointer to the ith element by:
&vec[i]
So we can write:
vec.erase(&vec[i]); // To delete the ith element
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In which scenario do I use a particular STL container?
...e bottom as a guide on which to use in different usage scenarios:
Created by David Moore and licensed CC BY-SA 3.0
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String.replaceAll single backslashes with double backslashes
...ecessarily need regex for this, simply because you want an exact character-by-character replacement and you don't need patterns here. So String#replace() should suffice:
string.replace("\\", "\\\\");
Update: as per the comments, you appear to want to use the string in JavaScript context. You'd ...
Rotating a point about another point (2D)
... operation (i.e. calculating the inverse angle and then rotating clockwise by that amount)? I've seen a ton of pages giving this same formula, but nobody ever seems to see fit to talk about directionality in relation to the input / output values...
– NetXpert
A...
What does “O(1) access time” mean?
...ant such that the runtime (or number of operations, etc.) is bounded above by the constant. There could still be large variance in the runtime: e.g., int main() { int n; cin >> n; if(n == 0) { sleep(60 * 60 * 24 * 365); } cout << n; } is O(1).
– jason
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What is the difference between Class Path and Build Path
...ally a sequence of JAR file names and directory names. The classpath used by the compiler and the runtime system don't have to be the same, but they typically should be, especially for a small project.
Buildpath is not standard Java terminology. It is the term for the richer way that a typical ID...
What is the difference between named and positional parameters in Dart?
... not specify a value.
Positional optional parameters
A parameter wrapped by [ ] is a positional optional parameter. Here is an example:
getHttpUrl(String server, String path, [int port=80]) {
// ...
}
In the above code, port is optional and has a default value of 80.
You can call getHttpUr...
NodeJS require a global module/package
...t look in the folder where global modules are installed.
You can fix this by setting the NODE_PATH environment variable. In Linux this will be:
export NODE_PATH=/usr/lib/node_modules
Note: This depend on where your global modules are actually installed.
See: Loading from the global folders.
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What does the constant 0.0039215689 represent?
...bly safe to guess that this was done for performance reasons.
Multiplying by the reciprocal is faster than repeatedly dividing by 255.
Side Note:
If you're wondering why such a micro-optimization isn't left to the compiler, it's because it is an unsafe floating-point optimization. In other word...