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What are the differences between concepts and template constraints?
...Constraints are part of the concepts proposal and are a necessary building block in its definition.
In Design of Concept Libraries for C++, Sutton and Stroustrup consider the following relationship:
Concepts = Constraints + Axioms
To quickly summarise their meanings:
Constraint - A predicat...
When and why are database joins expensive?
...ex is driven by the height of the b-tree index and the access of the table block itself. It's fast, but not suitable for bulk joins.
A nested loop join based on a cluster is much cheaper, with fewer logicAL IO'S required per join row -- if the joined tables are both in the same cluster then the join...
Why does Windows64 use a different calling convention from all other OSes on x86-64?
...g heap pages on sbrk(), or copy-on-write pagefaults) an enormous amount of block copy/fill, hence it'll be useful for code so frequently used to save the two or three CPU instructions that'd otherwise load such source/target address arguments into the "correct" registers.
So in a way, UN*X and Win64...
What is a NullPointerException, and how do I fix it?
...ion, per the JLS:
SynchronizedStatement:
synchronized ( Expression ) Block
Otherwise, if the value of the Expression is null, a NullPointerException is thrown.
How do I fix it?
So you have a NullPointerException. How do you fix it? Let's take a simple example which throws a Null...
Is MATLAB OOP slow or am I doing something wrong?
...++ classes are typically built such that objects are the smallest building blocks, as specific as you can (that is, lots of different classes), and you compose them in arrays, collection objects, etc, and iterate over them with loops. To make fast MATLAB classes, turn that approach inside out. Have ...
How to get started with developing Internet Explorer extensions?
...E5 Browser Helper Object (yeah, those infamous BHOs that everyone liked to block back in the day), toolbars and the new accelerators for IE.
Even then, compatibility will break sometimes. I used to maintain an extension for IE6 that broke with IE7, so there are some things that have changed. For the...
Why do we need private subnet in VPC?
... used in outbound security groups, in place of a destination IP address or block -- and an S3 VPC endpoint can be subject to additional policy statements, restricting bucket access from inside, as desired.
2. As noted in the documentation, what's actually being discussed here is port as well as net...
How to profile a bash shell script slow startup?
...libc.so.6", O_RDONLY) = 4
0.000462 0.000825 open("/dev/tty", O_RDWR|O_NONBLOCK) = 4
0.000147 0.000972 open("/usr/lib/locale/locale-archive", O_RDONLY) = 4
...
0.000793 1.551331 open("/etc/ld.so.cache", O_RDONLY) = 4
0.000127 1.551458 open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY) = 4
0....
Why should I use a pointer rather than the object itself?
...s the storage duration of the object. When doing Object myObject; within a block, the object is created with automatic storage duration, which means it will be destroyed automatically when it goes out of scope. When you do new Object(), the object has dynamic storage duration, which means it stays a...
What's the difference between a continuation and a callback?
...can be used to implement complex control flow structures such as try-catch blocks, coroutines, generators, fibers, etc.
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