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Docker: adding a file from a parent directory
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231
You can build the Dockerfile from the parent directory:
docker build -t <some tag> -f &...
Return Boolean Value on SQL Select Statement
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257
What you have there will return no row at all if the user doesn't exist. Here's what you need:...
pydot and graphviz error: Couldn't import dot_parser, loading of dot files will not be possible
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220
Answer for pydot >= 1.1:
The incompatibility of (upstream) pydot has been fixed by 6dff94b...
How do I remedy “The breakpoint will not currently be hit. No symbols have been loaded for this docu
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112 Answers
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Interface type check with Typescript
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242
You can achieve what you want without the instanceof keyword as you can write custom type guar...
@Basic(optional = false) vs @Column(nullable = false) in JPA
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Is cout synchronized/thread-safe?
...t?
In C++11, we do have some guarantees. The FDIS says the following in §27.4.1 [iostream.objects.overview]:
Concurrent access to a synchronized (§27.5.3.4) standard iostream object’s formatted and unformatted input (§27.7.2.1) and output (§27.7.3.1) functions or a standard C stream by mu...
Learning Python from Ruby; Differences and Similarities
...e statements; Python does not.
Ruby supports the standard expr ? val1 : val2 ternary operator; Python does not.
Ruby supports only single inheritance. If you need to mimic multiple inheritance, you can define modules and use mix-ins to pull the module methods into classes. Python supports multiple...
find -exec cmd {} + vs | xargs
...n.
So your code should look like this:
find . -exec cmd -option1 -option2 -- {} +
or
find . -print0 | xargs -0 cmd -option1 -option2 --
The first version is shorter and easier to write as you can ignore 1, but
the second version is more portable and safe, as "-exec cmd {} +" is a relatively...