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Will the base class constructor be automatically called?
...The constructors for each type in the type hierarchy will be called in the order of Most Base -> Most Derived.
So in your particular instance, it calls Person(), and then Customer() in the constructor orders. The reason why you need to sometimes use the base constructor is when the constructors...
Seeking clarification on apparent contradictions regarding weakly typed languages
...o". If the developer is wrong, then the runtime will throw an exception in order to protect type safety. If the developer wishes to break type safety or memory safety, they can do so by turning off the type safety system by making an "unsafe" block. In an unsafe block you can use pointer magic to tr...
How do malloc() and free() work?
...ust add it to a free list that calloc() and malloc() will consult later in order to reuse the released blocks.
Even if a free() wanted to return memory to the system, it would need at least one contiguous memory page in order to get the kernel to actually protect the region, so releasing a small bl...
How to output only captured groups with sed?
... groups and their back references. The back references are numbered in the order the groups appear, but they can be used in any order and can be repeated:
echo "foobarbaz" | sed -r 's/^foo(.*)b(.)z$/\2 \1 \2/'
outputs "a bar a".
If you have GNU grep (it may also work in BSD, including OS X):
ec...
Regular expression to stop at first match
...n regex engines which implement the Perl 5 extensions (Java, Ruby, Python, etc) but not in "traditional" regex engines (including JavaScript, Awk, sed, grep without -P, etc).
– tripleee
Jul 8 at 17:52
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Delete specific line number(s) from a text file using sed?
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On my system, when processing large files, sed appears an order of magnitude slower than a simple combination of head and tail: here's an example of the faster way (without in-place mode): delete-line() { local filename="$1"; local lineNum="$2"; head -n $((lineNum-1)) "$filename"; t...
mongodb/mongoose findMany - find all documents with IDs listed in array
... Kind of late to this discussion, but how would you ensure the order of the items returned matches the order of the array of items you provide in the array? Documents are not guaranteed to come out in any order unless you specify a sort. What if you want them sorted in the same order you...
Find location of a removable SD card
...d path by following the answers below this (scanning /proc/mounts, /system/etc/vold.fstab, etc...).
– Learn OpenGL ES
Feb 17 '13 at 15:29
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AWS MySQL RDS vs AWS DynamoDB [closed]
... for a fair while now and I'm comfortable with its structure & SQL Queries etc.
4 Answers
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What is the yield keyword used for in C#?
...ithout creating temp collections.
It helps to do stateful iteration.
In order to explain above two points more demonstratively, I have created a simple video you can watch it here
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