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What's the difference between => , ()=>, and Unit=>
...what is passed is substituted for the value name inside the function. For example, take this function:
def f(x: => Int) = x * x
If I call it like this
var y = 0
f { y += 1; y }
Then the code will execute like this
{ y += 1; y } * { y += 1; y }
Though that raises the point of what happens...
Copy folder recursively, excluding some folders
...der including hidden files and folders into another folder, but I want to exclude certain specific folders. How could I achieve this?
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How to loop through all the properties of a class?
... " + property.Name + ", Value: " + property.GetValue(obj, null));
}
for Excel - what tools/reference item must be added to gain access to BindingFlags, as there is no "System.Reflection" entry in the list
Edit: You can also specify a BindingFlags value to type.GetProperties():
BindingFlags flags...
c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
...ime reader first time poster! I'm playing around with the boost::multi_index container stuff and have a rather in-depth question that hopefully a boost or C++ container expert might know (my knowledge in C++ containers is pretty basic). For reference, the boost documentation on composite keys can be...
What's the opposite of chr() in Ruby?
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If String#ord didn't exist in 1.9, it does in 2.0:
"A".ord #=> 65
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What is the C++ function to raise a number to a power?
... I recommend to read my comment before adding a comment. ;-) I explained that it DOES give an ambiguity. (Compiler of VS2008)
– Marvin
May 3 '13 at 10:28
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What is the difference/usage of homebrew, macports or other package installation tools? [closed]
...udo apt-get in Ubuntu. I've heard that I should use homebrew but I'm not exactly sure what homebrew or macports does?
4 A...
How to find the port for MS SQL Server 2008?
...port is 1433 but some how it is not listening at this port. The SQL is an Express edition.
13 Answers
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What are C++ functors and their uses?
...ate objects which "look like" a function:
// this is a functor
struct add_x {
add_x(int val) : x(val) {} // Constructor
int operator()(int y) const { return x + y; }
private:
int x;
};
// Now you can use it like this:
add_x add42(42); // create an instance of the functor class
int i = add4...
Can you call Directory.GetFiles() with multiple filters?
... this will return all files in a string array and then filter that by the extensions you specify. That might not be a big issue if "C:\Path" doesn't have lot of files underneath it, but may be a memory/performance issue on "C:\" or something like that.
– Christian.K
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