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Why do we not have a virtual constructor in C++?
...f:
Technical reason
The object exists only after the constructor ends.In order for the constructor to be dispatched using the virtual table , there has to be an existing object with a pointer to the virtual table , but how can a pointer to the virtual table exist if the object still doesn't exist?...
What happens if you static_cast invalid value to enum class?
... to the enumeration type, no value in data[0] can lead to UB for the static_cast.
After CWG 1766 (C++17)
See CWG defect 1766.
The [expr.static.cast]p10 paragraph has been strengthened, so you now can invoke UB if you cast a value that is outside the representable range of an enum to the enum type. ...
git push says “everything up-to-date” even though I have local changes
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@John You need to be in a branch in order to push. As long as you are in a detached HEAD mode, that would not work. Reset your branch to where you are: git branch -f myBranch HEAD, then checkout said branch, and push it. In your case, myBranch might be master i...
Circle drawing with SVG's arc path
...utely specifies where the start point of all shapes is. It has to do so in order for dash arrays to work on shapes.
– Paul LeBeau
Jan 17 '17 at 3:50
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PostgreSQL query to return results as a comma separated list
... If you wanted to sort the column select string_agg(id, ', ' order by id desc) from table
– M A Hossain Tonu
Aug 14 '18 at 9:31
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JS - get image width and height from the base64 code
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I would also add that the order here is very important. If you do this the other way around (src before onload) you may miss the event. See: stackoverflow.com/a/2342181/4826740
– maxshuty
Apr 4 '17 at 17:58
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How to specify maven's distributionManagement organisation wide?
...ocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>your.company</groupId>
<artifactId>company-parent</artifactId>
<version>1.0.0-SNAPSHOT</version>
&...
Pattern to avoid nested try catch blocks?
... of performing a calculation, each of which can fail with an exception. In order to attempt each calculation until we find one that succeeds, I have been doing the following:
...
Is MD5 still good enough to uniquely identify files?
...the hash are the same : you can only compare byte-for-byte. A hash is many orders of magnitude smaller than the number of different values for the whole file, so there are many, many, many possible collisions for each hash values. Only if you are in the case of copying a known file (with a known has...
window.onload vs document.onload
...the load event.
A load event is dispatched at the window.
Therefore, the order of execution will be
DOMContentLoaded event listeners of window in the capture phase
DOMContentLoaded event listeners of document
DOMContentLoaded event listeners of window in the bubble phase
load event listeners (in...