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Why not infer template parameter from constructor?
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Yeah, lol at the idea of declaring the make function as a static member... think about that for juuust a second. That aside: free make functions were indeed the solution, but it's a lot of redundant boilerplate, that while you're typing it, y...
Retrieving the last record in each group - MySQL
...n EXPLAIN).
I have a couple of other solutions that are based on the same ideas:
if the underlying index is BTREE index (which is usually the case), the largest (group_id, item_value) pair is the last value within each group_id, that is the first for each group_id if we walk through the index in ...
How to build Qt for Visual Studio 2010
...pt (2010) link from your start menu, or even pin it to the taskbar (a good idea). This is a special command prompt which has all the variables set for building with Visual Studio 2010 tools.
Once within the command prompt, navigate to your extracted Qt folder using old-school DOS way, which means y...
vim, switching between files rapidly using vanilla Vim (no plugins)
...R>
or:
gb
(quickly scanning the list)
foo<tab><CR>
The idea comes from this image taken from Bairui's collection of Vim infographics:
Vim also has <C-^> (or <C-6> on some keyboards)—the normal mode equivalent of :b#—to jump between the current buffer and the pr...
Resolve build errors due to circular dependency amongst classes
...{
A a;
}
You can see why the compiler can't deal with this - it has no idea what B is - it has never even seen the symbol before.
So let's tell the compiler about B. This is known as a forward declaration, and is discussed further in this answer.
// main.cc
class B;
#include "A.h"
#include "B....
Best practices: throwing exceptions from properties
...hen the state is invalid. But it is also generally considered to be a good idea to design your classes such that it is simply not possible to get an invalid object initially, or to put it into invalid state via normal means (i.e., always ensure full initialization in constructors, and try make metho...
How to access outer class from an inner class?
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Great work. Inspired by this solution idea and a bit of thinking, I expanded parts of this answer to create another answer below with some more explanation.
– Edward
Jan 31 '16 at 20:10
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Final arguments in interface methods - what's the point?
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IntelliJ does this. My version is IntelliJ IDEA 2016.1.3 Build #IU-145.1617.
– Dormouse
Oct 12 '16 at 15:36
1
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How can I use a Python script in the command line without cd-ing to its directory? Is it the PYTHONP
...hon files given as arguments.
Needing PYTHONPATH to be set is not a great idea - as with anything dependent on environment variables, replicating things consistently across different machines gets tricky. Better is to use Python 'packages' which can be installed (using 'pip', or distutils) in syste...
Why should we typedef a struct so often in C?
...ed C projects where this use of typedef to hide struct is considered a bad idea, the Linux kernel is probably the most well-known such project. See Chapter 5 of The Linux Kernel CodingStyle document for Linus' angry words. :) My point is that the "should" in the question is perhaps not set in stone,...