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What is the best way to use a HashMap in C++?
...mally expected to have constant complexity. That is, an insertion, lookup, etc., typically takes essentially a fixed amount of time, regardless of how many items are in the table. An std::map has complexity that's logarithmic on the number of items being stored -- which means the time to insert or r...
How to set background color of HTML element using css properties in JavaScript
...ithout any dashes. So background-color becomes backgroundColor.
function setColor(element, color)
{
element.style.backgroundColor = color;
}
// where el is the concerned element
var el = document.getElementById('elementId');
setColor(el, 'green');
...
Rails Root directory path?
...
[
rails_root.join('app', 'models'),
# Add your decorators, services, etc.
].each do |path|
$LOAD_PATH.unshift path.to_s
end
Which allows you to easily load Plain Old Ruby Objects from their spec files.
# spec/models/poro_spec.rb
require 'spec_helper'
require 'poro'
RSpec.describe ...
...
Sqlite or MySql? How to decide? [closed]
...d that has lots of selects and a few updates, and want them to go smoothly etc.
a lot of memory usage, for example, to buffer parts of your 1Tb database in your 32G of memory.
You need to use mysql or some other server-based RDBMS.
Note that MySQL is not the only choice and there are plenty of ot...
BACKUP LOG cannot be performed because there is no current database backup
...a new database.
Make sure you have access to your database (user, password etc).
Make sure there is a backup file with no error in it.
Hope this can help you.
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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...
This depends on what you actually call "mutex", OS mode and etc.
At minimum it's a cost of an interlocked memory operation. It's a relatively heavy operation (compared to other primitive assembler commands).
However, that can be very much higher. If what you call "mutex" a kernel ob...
JavaScript object: access variable property by name as string [duplicate]
...he fact that right could also come from a variable, function return value, etc., when using bracket notation.
If you NEED a function for it, here it is:
function read_prop(obj, prop) {
return obj[prop];
}
To answer some of the comments below that aren't directly related to the original que...
Lock Escalation - What's happening here?
...fects locking behaviour during the DML statements (INSERT, UPDATE, DELETE, etc.), not during the DDL statements (ALTER). SCH-M lock is always a lock of the whole database object, table in this example.
This is likely where the confusion comes from.
SSMS adds the ALTER TABLE <TableName> SET (...
Best practices for API versioning? [closed]
...ges commonly used to implement web services (Java, .NET, PHP, Perl, Rails, etc.) allow easy binding of web service end-point(s) to a base URI. This way it's easy to gather and keep a collection of files/classes/methods separate across different API versions.
From the API users POV, it's also easie...
ASP.NET MVC 5 vs. AngularJS / ASP.NET WebAPI [closed]
...ns is a better idea, hence the evolution of ASP.NET from web forms, to MVC etc. It's not really difficult for developers to get to grips with HTML and use an angular front end, moreover this makes UI designers jobs easier, they have pure HTML and JSON/Javascript, they don't need to go about understa...