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When should you use 'friend' in C++?
... access the private parts of class Child.
friend class Mother;
public:
string name( void );
protected:
void setName( string newName );
};
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Passing argument to alias in bash [duplicate]
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An alias will expand to the string it represents. Anything after the alias will appear after its expansion without needing to be or able to be passed as explicit arguments (e.g. $1).
$ alias foo='/path/to/bar'
$ foo some args
will get expanded to
$ ...
Determine the data types of a data frame's columns
...integer" "logical" "factor"
Using str() gets you that information plus extra goodies (such as the levels of your factors and the first few values of each variable):
str(my.data)
'data.frame': 5 obs. of 4 variables:
$ y : num 1.03 1.599 -0.818 0.872 -2.682
$ x1: int 1 2 3 4 5
$ x2: logi T...
Java 8 Iterable.forEach() vs foreach loop
...c.join(mSession, join));
is not intended as a shortcut for writing
for (String join : joins) {
mIrc.join(mSession, join);
}
and should certainly not be used in this way. Instead it is intended as a shortcut (although it is not exactly the same) for writing
joins.forEach(new Consumer<T&g...
Why should I avoid using Properties in C#?
...ly-typed system, to avoid what Fowler calls Syntactic Noise. We don't want extra parentheses, extra get/set warts, or extra method signatures - not if we can avoid them without any loss of clarity.
Say whatever you like, but foo.Bar.Baz = quux.Answers[42] is always going to be a lot easier to read ...
How to call getClass() from a static method in Java?
...putStream when used in a MapReduce.
public static InputStream getResource(String resource) throws Exception {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
InputStream is = cl.getResourceAsStream(resource);
return is;
}
...
If vs. Switch Speed
...ector to look at the code produced, you will see that for huge switches on strings, the compiler will actually generate code that uses a hash table to dispatch these. The hash table uses the strings as keys and delegates to the case codes as values.
This has asymptotic better runtime than lots of c...
What's wrong with nullable columns in composite primary keys?
...s version the "ext" part of the tuple is NOT NULL but defaults to an empty string -- which is semantically (and practically) different from a NULL. A NULL is an unknown, whereas an empty string is a deliberate record of "something not being present". In other words, "empty" and "null" are different ...
Use of alloc init instead of new
...selected ones are:
new doesn't support custom initializers (like initWithString)
alloc-init is more explicit than new
General opinion seems to be that you should use whatever you're comfortable with.
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How to create a directory using Ansible
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this uses the old syntax with = chars, would be great to update it with the : syntax with each atribute on a new line
– ympostor
Jun 8 '17 at 7:52
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