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Why does C++ require a user-provided default constructor to default-construct a const object?
...of T would invoke a user-provided constructor
of T (not inherited from a base class) or if
each direct non-variant non-static data member M of T has a default member initializer or, if M is of class type X (or array thereof), X
is const-default-constructible,
if T is a union with at le...
Rails 4 multiple image or file upload using carrierwave
...avatar:string
rake db:migrate
In post.rb
class Post < ActiveRecord::Base
has_many :post_attachments
accepts_nested_attributes_for :post_attachments
end
In post_attachment.rb
class PostAttachment < ActiveRecord::Base
mount_uploader :avatar, AvatarUploader
belongs_to :post
end...
What is a 'multi-part identifier' and why can't it be bound?
I continually get these errors when I try to update tables based on another table. I end up rewriting the query, change the order of joins, change some groupings and then it eventually works, but I just don't quite get it.
...
Python Empty Generator Function
... the same thing.
It's a subtle difference, but I honestly think the yield-based functions are more readable and maintainable.
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Is unsigned integer subtraction defined behavior?
...n the two expressions we are discussing is performed in type unsigned int, based on the operand types. The result of the addition is unsigned int. Then that result is implicitly converted to the type required in context, a conversion which fails because the value is not representable in the new ty...
REST APIs: custom HTTP headers vs URL parameters
... A "client" is a resource that can be acted upon, so should be part of the base url: /orders/view/client/23.
Parameters are just that, to parameterize access to the resource. This especially comes into play with posts and searches: /orders/find?q=blahblah&sort=foo. There's a fine line betwe...
Difference between Observer, Pub/Sub, and Data Binding
...the functions stored in that array.
If we want to group observers handlers based on different events. We just need to modify that observersList to an Object like
var events = {
"event1": [handler1, handler2],
"event2": [handler3]
}
see this pubsub example for details.
and people call this v...
How can I get a list of all classes within current module in Python?
...m in dir(platforms)
# Ignore magic, ourselves (index.py) and a base class.
if not item.startswith('__') and item not in ['index', 'base']
)
))
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From Arraylist to Array
...e-sized array (which might be faster in older Java versions or non-HotSpot based JVMs).
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Delete multiple remote branches in git
...f on the remote nor begins with refs/, and we are unable to guess a prefix based on the source ref. error: failed to push some refs to 'GIT_URL'
– Jake A. Smith
May 11 '12 at 16:49
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