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How should one use std::optional?
I'm reading the documentation of std::experimental::optional and I have a good idea about what it does, but I don't understand when I should use it or how I should use it. The site doesn't contain any examples as of yet which leaves it harder for me to grasp the true concept of this object. When...
Scalar vs. primitive data type - are they the same thing?
In various articles I have read, there are sometimes references to primitive data types and sometimes there are references to scalars.
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SignalR - Sending a message to a specific user using (IUserIdProvider) *NEW 2.0.0*
In the latest version of Asp.Net SignalR, was added a new way of sending a message to a specific user, using the interface "IUserIdProvider".
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Comparing two collections for equality irrespective of the order of items in them
I would like to compare two collections (in C#), but I'm not sure of the best way to implement this efficiently.
19 Answers...
PDO Prepared Inserts multiple rows in single query
I am currently using this type of SQL on MySQL to insert multiple rows of values in one single query:
22 Answers
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How to write log base(2) in c/c++
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Simple math:
log2 (x) = logy (x) / logy (2)
where y can be anything, which for standard log functions is either 10 or e.
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ImportError: numpy.core.multiarray failed to import
I'm trying to run this program
26 Answers
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How can I make an “are you sure” prompt in a Windows batchfile?
I have a batch file that automates copying a bunch of files from one place to the other and back for me. Only thing is as much as it helps me I keep accidentally selecting that command off my command buffer and mass overwriting uncommited changes.
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Expand a random range from 1–5 to 1–7
Given a function which produces a random integer in the range 1 to 5, write a function which produces a random integer in the range 1 to 7.
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When do you use the “this” keyword? [closed]
...her people use the this keyword. I tend to use it in constructors, but I may also use it throughout the class in other methods. Some examples:
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