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make: Nothing to be done for `all'
...n which make will need to (re)build:
If you modify one of your .c files, then it will be newer than hello, and then it will have to rebuild when you run make.
If you delete hello, then it will obviously have to rebuild it
You can force make to rebuild everything with the -B option. make -B all
mak...
Position absolute but relative to parent
...#father have position: relative, and the children have position: absolute, then use top and bottom to position the children.
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How to read XML using XPath in Java
...XPath();
XPathExpression expr = xpath.compile(<xpath_expression>);
Then you call expr.evaluate() passing in the document defined in that code and the return type you are expecting, and cast the result to the object type of the result.
If you need help with a specific XPath expressions, you ...
bash: shortest way to get n-th column of output
...ining columns. If you want to print the second column, use read a b c; and then use echo instead of rm. I used this to get a bunch of process of IDs that followed a grep pattern, so I could interrupt them all.
– Matt Kleinsmith
Mar 2 '18 at 20:46
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c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
...rted by lexicographical order, i.e. sorting is performed by the first key, then the second key if the first one is equal, etc". Does this mean that the structure is stored such that a lookup for a specific 2-part composite key will take O(n=1) time, i.e. is the container sorted such that there ...
How to stop a goroutine
...nels.
That is, once you're done sending items on the chan, you close it. Then inside your goroutine you get an extra parameter to the receive operator that shows whether the channel has been closed.
Here is a complete example (the waitgroup is used to make sure that the process continues until th...
How to change root logging level programmatically for logback
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@JohnWiseman If you want it be configured, then you have to configure it somewhere. As slf4j offers nothing in this respect, there will always be something dependent on the underlying logger. Be it a piece of code or a configuration file. +++ If it should be done prog...
How to compute the similarity between two text documents?
...on way of doing this is to transform the documents into TF-IDF vectors and then compute the cosine similarity between them. Any textbook on information retrieval (IR) covers this. See esp. Introduction to Information Retrieval, which is free and available online.
Computing Pairwise Similarities
TF...
How do I upgrade PHP in Mac OS X?
...rew tap homebrew/homebrew-php
$ brew options php56
$ brew install php56
Then config in your .bash_profile or .bashrc
# Homebrew PHP CLI
export PATH="$(brew --prefix homebrew/php/php56)/bin:$PATH"
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Jackson enum Serializing and DeSerializer
...ize(using = MyDeserializer.class)
public final class MyClass {
...
}
Then you have to write MySerializer and MyDeserializer which look like this:
MySerializer
public final class MySerializer extends JsonSerializer<MyClass>
{
@Override
public void serialize(final MyClass yourCla...