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How to implement an STL-style iterator and avoid common pitfalls?
...-style, random-access iterator. I was searching around for an example implementation of an iterator but I didn't find any. I know about the need for const overloads of [] and * operators. What are the requirements for an iterator to be "STL-style" and what are some other pitfalls to avoid (if an...
Understanding ibeacon distancing
... ibeacon (beacon/ Bluetooth-lowenergy/BLE) can work. Is there any true documentation on how far exactly an ibeacon can measure. Lets say I am 300 feet away...is it possible for an ibeacon to detect this?
...
Downloading a large file using curl
...
<?php
set_time_limit(0);
//This is the file where we save the information
$fp = fopen (dirname(__FILE__) . '/localfile.tmp', 'w+');
//Here is the file we are downloading, replace spaces with %20
$ch = curl_init(str_replace(" ","%20",$...
What is a reasonable order of Java modifiers (abstract, final, public, static, etc.)?
...
The customary usage order of the modifiers is mentioned in the Java Language Specification (and not the Java Virtual Machine Specification) e.g. for class modifiers you will find the following definition (extract):
ClassModifiers:
ClassModifier
ClassModifiers Cl...
How to npm install to a specified directory?
...y existing node_modules directory higher up in the hierarchy. (See npm documentation on folders.)
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Why is rbindlist “better” than rbind?
I am going through documentation of data.table and also noticed from some of the conversations over here on SO that rbindlist is supposed to be better than rbind .
...
What is the difference between Non-Repeatable Read and Phantom Read?
... query is different from the first.
Simple examples:
User A runs the same query twice.
In between, User B runs a transaction and commits.
Non-repeatable read: The A row that user A has queried has a different value the second time.
Phantom read: All the rows in the query have the same value bef...
How does generic lambda work in C++14?
How does generic lambda work ( auto keyword as an argument type) in C++14 standard?
3 Answers
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Define make variable at rule execution time
...ariable to the result of the shell function call.
edit (in response to comments):
To create a unique variable, you could do the following:
out.tar :
$(eval $@_TMP := $(shell mktemp -d))
@echo hi $($@_TMP)/hi.txt
tar -C $($@_TMP) cf $@ .
rm -rf $($@_TMP)
This would prepend the n...
What are the differences between Deferred, Promise and Future in JavaScript?
...tempted to answer the OP's question. The literal answer is, a promise is something shared w/ other objects, while a deferred should be kept private. Primarily, a deferred (which generally extends Promise) can resolve itself, while a promise might not be able to do so.
If you're interested in the m...