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Why aren't variable-length arrays part of the C++ standard?
...a new syntax for declaring functions that take 2D VLAs as parameters: void foo(int n, int A[][*]).
Less importantly in the C++ world, but extremely important for C's target audience of embedded-systems programmers, declaring a VLA means chomping an arbitrarily large chunk of your stack. This is a gu...
How to save a data.frame in R?
...ys. One way is to use save() to save the exact object. e.g. for data frame foo:
save(foo,file="data.Rda")
Then load it with:
load("data.Rda")
You could also use write.table() or something like that to save the table in plain text, or dput() to obtain R code to reproduce the table.
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What are the differences between Generics in C# and Java… and Templates in C++? [closed]
...:
C# Generics allow you to declare something like this.
List<Person> foo = new List<Person>();
and then the compiler will prevent you from putting things that aren't Person into the list.
Behind the scenes the C# compiler is just putting List<Person> into the .NET dll file, but at...
Can I use conditional statements with EJS templates (in JMVC)?
...t, write the conditional inline? That is writing <% if (true) { include foo/bar } %> appears to error. Is there a method similar or is it necessary to break out the include by <% %>.
– kuanb
Sep 12 '16 at 21:48
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How to check if a string contains a substring in Bash
...you can get a similar effect with a case statement:
case "$string" in
*foo*)
# Do stuff
;;
esac
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How to remove items from a list while iterating?
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@Derek x = ['foo','bar','baz']; y = x; x = [item for item in x if determine(item)]; This reassigns x to the result of the list comprehension, but y still refers to the original list ['foo','bar','baz']. If you expected x and y to refer to...
基于PECL OAuth打造微博应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...令来检测这种现象，大致方法如下：
shell> tcpdump -A host foo.com
此时，某些防火墙会过滤掉非标准HTTP1.0的请求头，如Host请求头，从而造成错误。
详见：由于 HTTP request 不规范导致的被防火墙拦截。
新类MicroblogOAuth直接扩展自PE...
How to cast/convert pointer to reference in C++
...can I pass a pointer ( Object *ob ) to a function which prototype is void foo(Object &) ?
2 Answers
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How do you set a default value for a MySQL Datetime column?
...at will update when the row is updated. The type definition:
CREATE TABLE foo (
`creation_time` DATETIME DEFAULT CURRENT_TIMESTAMP,
`modification_time` DATETIME ON UPDATE CURRENT_TIMESTAMP
)
Reference:
http://optimize-this.blogspot.com/2012/04/datetime-default-now-finally-available.ht...
How to count certain elements in array?
...rn this into a one-liner if you only need to count one value:
_.countBy(['foo', 'foo', 'bar'])['foo']; // 2
This also works fine on arrays of numbers. The one-liner for your example would be:
_.countBy([1, 2, 3, 5, 2, 8, 9, 2])[2]; // 3
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