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std::function and std::bind: what are they, and when should they be used?
...meters_in_the_right_flipping_order = bind(memcpy, _2, _1, _3);
I don't recommend using it just because you don't like the API, but it has potential practical uses for example because:
not2(bind(less<T>, _2, _1));
is a less-than-or-equal function (assuming a total order, blah blah). This e...
How to delete a word and go into insert mode in Vim?
..." by typing "ciw" to delete a word your cursor is on.
The "inner" and "a" commands are great in Vim, also try "ci{" inside a {} block, or "ca{" if you also wish to remove the {} characters too. To translate these commands to English to remember them better, try: "change inner { block" and "change ...
Cross field validation with Hibernate Validator (JSR 303)
...ws the error message to be specified per match.
For example, validating a common form:
@FieldMatch.List({
@FieldMatch(first = "password", second = "confirmPassword", message = "The password fields must match"),
@FieldMatch(first = "email", second = "confirmEmail", message = "The ...
Web-scraping JavaScript page with Python
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dryscape isn't maintained anymore and the library dryscape developers recommend is Python 2 only. I have found using Selenium's python library with Phantom JS as a web driver fast enough and easy to get the work done.
Once you have installed Phantom JS, make sure the phantomjs binary is availabl...
How to specify a multi-line shell variable?
...
set -e exits the shell if a command has an "unanticipated" non-zero exit status. By "unanticipated", I mean it runs in a context where you aren't specifically looking at its exit status. false by itself, for instance, would exit the shell. false || true...
Pandas dataframe get first row of each group
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Is there a way to instantiate a class by name in Java?
...ewInstance() method on this object:
Class<?> clazz = Class.forName("com.foo.MyClass");
Constructor<?> constructor = clazz.getConstructor(String.class, Integer.class);
Object instance = constructor.newInstance("stringparam", 42);
Both methods are known as reflection. You will typically...
How to prevent browser page caching in Rails
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Finally figured this out - http://blog.serendeputy.com/posts/how-to-prevent-browsers-from-caching-a-page-in-rails/ in application_controller.rb
After Rails 5:
class ApplicationController < ActionController::Base
before_action :set_cache_headers
private
def set_c...
Cast a Double Variable to Decimal
...ller. A double value may be out of range for a decimal. See: stackoverflow.com/questions/7817866/…
– Guffa
Aug 14 '14 at 18:59
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