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What are the complexity guarantees of the standard containers?
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IList vs IEnumerable for Collections on Entities
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183
IEnumerable<T> represents a series of items that you can iterate over (using foreach, for ...
What are the advantages of NumPy over regular Python lists?
...as you describe, in Python, would take at least 20 MB or so, while a NumPy 3D array with single-precision floats in the cells would fit in 4 MB. Access in reading and writing items is also faster with NumPy.
Maybe you don't care that much for just a million cells, but you definitely would for a bil...
(How) can I count the items in an enum?
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123
There's not really a good way to do this, usually you see an extra item in the enum, i.e.
enum ...
Convert Enumeration to a Set/List
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326
You can use Collections.list() to convert an Enumeration to a List in one line:
List<T>...
Are std::vector elements guaranteed to be contiguous?
...f course contain this as a requirement.
From n2798 (draft of C++0x):
23.2.6 Class template vector [vector]
1 A vector is a sequence container that supports random access iterators. In addition, it supports (amortized)
constant time insert and erase operations at the end; insert and erase...
What is “lifting” in Scala?
...gt;
scala> res1(-1)
res2: Option[Boolean] = None
scala> res1(1)
res3: Option[Boolean] = Some(false)
Methods
You can "lift" a method invocation into a function. This is called eta-expansion (thanks to Ben James for this). So for example:
scala> def times2(i: Int) = i * 2
times2: (i: In...
What is a C++ delegate?
... {
return (int) d + 1;
}
};
// Use:
Functor f;
int i = f(3.14);
Option 2: lambda expressions (C++11 only)
// Syntax is roughly: [capture](parameter list) -> return type {block}
// Some shortcuts exist
auto func = [](int i) -> double { return 2*i/1.15; };
double d = func(...
Can ordered list produce result that looks like 1.1, 1.2, 1.3 (instead of just 1, 2, 3, …) with css?
Can an ordered list produce results that looks like 1.1, 1.2, 1.3 (instead of just 1, 2, 3, ...) with CSS? So far, using list-style-type:decimal has produced only 1, 2, 3, not 1.1, 1.2., 1.3.
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How do I use reflection to invoke a private method?
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gunr2171
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answered Sep 25 '08 at 19:33
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