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What are the big improvements between guava and apache equivalent libraries?
... use Guava, keeping Apache Commons around for the (rare) cases where Guava does not have the needed functionality. Let me attempt to explain why.
Guava is more "modern"
Apache Commons is a really mature library, but it's also almost 10 years old, and targets Java 1.4. Guava was open sourced in 200...
Will strlen be calculated multiple times if used in a loop condition?
...late it every time, but I don't think you can be sure, that every compiler does it.
In addition to that, the compiler has to know, that strlen(ss) does not change. This is only true if ss is not changed in for loop.
For example, if you use a read-only function on ss in for loop but don't declare...
How do I get the dialer to open with phone number displayed?
...legalStateException: Could not execute method of the activity.
Action_Dial doesn't require any permission.
If you want to initiate the call directly without user's interaction , You can use action Intent.ACTION_CALL. In this case, you must add the following permission in your AndroidManifest.xml:
&l...
How to check if an email address exists without sending an email?
... rejected.
MAIL FROM:<>
RCPT TO:<user@domain>
If the user doesn't exist, you'll get a 5.1.1 DSN. However, just because the email is not rejected, does not mean the user exists. Some server will silently discard requests like this to prevent enumeration of their users. Other servers ...
Why do we not have a virtual constructor in C++?
Why does C++ not have a virtual constructor?
22 Answers
22
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Center Align on a Absolutely Positioned Div
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How does this work? Can you please provide why your answer is valid?
– afuzzyllama
Dec 10 '12 at 18:08
1
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How do the post increment (i++) and pre increment (++i) operators work in Java?
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Does this help?
a = 5;
i=++a + ++a + a++; =>
i=6 + 7 + 7; (a=8)
a = 5;
i=a++ + ++a + ++a; =>
i=5 + 7 + 8; (a=8)
The main point is that ++a increments the value and immediately returns it.
a++ also increments the v...
lodash multi-column sortBy descending
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Why does lodash keep renaming functions?
– Kenny Worden
Jun 24 '16 at 15:29
16
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Creating an empty file in Ruby: “touch” equivalent?
...
FileUtils.touch looks like what it does, and mirrors* the touch command:
require 'fileutils'
FileUtils.touch('file.txt')
* Unlike touch(1) you can't update mtime or atime alone. It's also missing a few other nice options.
...
Separation of business logic and data access in django
...combines multiple closely related aspects:
execution of the command (what does it do?)
validation of the command parameters (can it do this?)
presentation of the command (how can I do this?)
forms.py
class ActivateUserForm(forms.Form):
user_id = IntegerField(widget = UsernameSelectWidget, ver...