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Is #pragma once part of the C++11 standard?
Traditionally, the standard and portable way to avoid multiple header inclusions in C++ was/is to use the #ifndef - #define - #endif pre-compiler directives scheme also called macro-guard scheme (see code snippet below).
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What is causing ERROR: there is no unique constraint matching given keys for referenced table?
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why isn't the declared PK considered as a unique constraint ? it's not like you can have a nonunique PK...
– amphibient
Sep 7 '16 at 18:14
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How can I check the size of a collection within a Django template?
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A list is considered to be False if it has no elements, so you can do something like this:
{% if mylist %}
<p>I have a list!</p>
{% else %}
<p>I don't have a list!</p>
{% endif %}
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EC2 instance types's exact network performance?
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Bandwidth is tiered by instance size, here's a comprehensive answer:
For t2/m3/c3/c4/r3/i2/d2 instances:
t2.nano = ??? (Based on the scaling factors, I'd expect 20-30 MBit/s)
t2.micro = ~70 MBit/s (qiita says 63 MBit/s) - t1.m...
Merging 2 branches together in GIT
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that means that both branches did change the same piece of code. fix up the conflitcs, git add conflicting_files and then git commit
– knittl
Aug 4 '10 at 10:20
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How to find indices of all occurrences of one string in another in JavaScript?
...le", "I learned to play the Ukulele in Lebanon.");
document.getElementById("output").innerHTML = indices + "";
<div id="output"></div>
share
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How to list all properties of a PowerShell object
...tersystem" | Format-List -Property *
For certain objects, PowerShell provides a set of formatting instructions that can affect either the table or list formats. These are usually meant to limit the display of reams of properties down to just the essential properties. However there are times when y...
Should I use static_cast or reinterpret_cast when casting a void* to whatever
Both static_cast and reinterpret_cast seem to work fine for casting void* to another pointer type. Is there a good reason to favor one over the other?
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How to return result of a SELECT inside a function in PostgreSQL?
...ens int)
RETURNS TABLE (txt text -- also visible as OUT parameter inside function
, cnt bigint
, ratio bigint) AS
$func$
BEGIN
RETURN QUERY
SELECT t.txt
, count(*) AS cnt -- column alias only visible inside
, (count(*) * 100...
JVM option -Xss - What does it do exactly?
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True, but I didn't say -Xss is the only cause for SOE and OOME, but the other way round - if set incorrectly, it can cause one of the two.
– Adam Adamaszek
Jun 3 '15 at 13:48
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