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How do I forward declare an inner class? [duplicate]
...tion order so that the nested class is fully defined first
Create a common base class that can be both used in the function and implemented by the nested class.
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What do column flags mean in MySQL Workbench?
...as binary strings. There is no character set so sorting and comparison is based on the numeric values of the bytes in the values.)
UN - Unsigned (non-negative numbers only. so if the range is -500 to 500, instead its 0 - 1000, the range is the same but it starts at 0)
UQ - Create/remove Unique...
How do I convert hex to decimal in Python? [duplicate]
... int(0xff) will do the right thing. It only requires an explicit base if it's passed as a string.
– cassm
Jan 15 '16 at 17:11
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Django - what is the difference between render(), render_to_response() and direct_to_template()?
... context_processors.
But direct_to_template should be avoided as function based generic views are deprecated. Either use render or an actual class, see https://docs.djangoproject.com/en/1.3/topics/generic-views-migration/
I'm happy I haven't typed RequestContext in a long, long time.
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How is it possible to declare nothing inside main() in C++ and yet have a working application after
...to be initialized before or during the first initialization of an std::ios_base::Init object. And <iostream> is guaranteed to behave "as if" it contained an instance of an std::ios_base_Init object at namespace scope.
– James Kanze
Jul 8 '13 at 15:30
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How do I explicitly specify a Model's table-name mapping in Rails?
...>= 3.2 (including Rails 4+ and 5+):
class Countries < ActiveRecord::Base
self.table_name = "cc"
end
Rails <= 3.1:
class Countries < ActiveRecord::Base
self.set_table_name "cc"
...
end
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Difference: std::runtime_error vs std::exception()
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std::exception is the class whose only purpose is to serve as the base class in the exception hierarchy. It has no other uses. In other words, conceptually it is an abstract class (even though it is not defined as abstract class in C++ meaning of the term).
std::runtime_error is a more spe...
Center/Set Zoom of Map to cover all visible Markers?
...t's usage:
There are many approaches for doing what you asked for:
Grid based clustering
Distance based clustering
Viewport Marker Management
Fusion Tables
Marker Clusterer
MarkerManager
You can read about them on the provided link above.
Marker Clusterer uses Grid Based Clustering to cluster ...
Purpose of Django setting ‘SECRET_KEY’
... 'django.contrib.messages' + settings.SECRET_KEY
contrib/sessions/backends/base.py:89: pickled_md5 = md5_constructor(pickled + settings.SECRET_KEY).hexdigest()
contrib/sessions/backends/base.py:95: if md5_constructor(pickled + settings.SECRET_KEY).hexdigest() != tamper_check:
contrib/s...
How to define a reply-to address?
...
Two ways:
class Notifications < ActionMailer::Base
default :from => 'your_app@your_domain.com',
:reply_to => 'some_other_address@your_domain.com'
end
Or:
class Contacts < ActionMailer::Base
def new_contact
mail( :to => 'somebody...