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When should I use malloc in C and when don't I?
... string as read-only. You cannot make changes to it. Example:
some_memory[0] = 'h';
Is asking for trouble.
On the other hand
some_memory = (char *)malloc(size_to_allocate);
is allocating a char array ( a variable) and some_memory points to that allocated memory. Now this array is both read a...
returning a Void object
...
|
edited Mar 9 '10 at 11:56
answered Mar 9 '10 at 11:34
...
How to reference style attributes from a drawable?
...
Make an attribute for your drawable in attrs.xml.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- Attributes must be lowercase as we want to use them for drawables -->
<attr name="my_drawable" format="reference" />
</resources>
Add your drawable to ...
How to get the original value of an attribute in Rails
...1+
Copied from Lucas Andrade's answer below: https://stackoverflow.com/a/50973808/9359123
Appending _was is deprecated in rails 5.1, now you should append _before_last_save
Something like:
before_save object
do_something_with object.name_before_last_save
end
Will return the name value bef...
Sending websocket ping/pong frame from browser
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kanakakanaka
60.3k2020 gold badges131131 silver badges130130 bronze badges
...
When to use symbols instead of strings in Ruby?
...r this:
require 'benchmark'
require 'haml'
str = Benchmark.measure do
10_000.times do
Haml::Engine.new('%input{type: "checkbox"}').render
end
end.total
sym = Benchmark.measure do
10_000.times do
Haml::Engine.new('%input{type: :checkbox}').render
end
end.total
puts "String: " + st...
Is there a simple way to remove unused dependencies from a maven pom.xml?
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answered Oct 4 '09 at 22:59
Pascal ThiventPascal Thivent
524k126126 gold badges10121012 silver badges10991099 bronze badges
...
python list by value not by reference [duplicate]
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220
As answered in the official Python FAQ:
b = a[:]
...
Defining custom attrs
...together:
<attr name="my_flag_attr">
<flag name="fuzzy" value="0x01" />
<flag name="cold" value="0x02" />
</attr>
In addition to attributes there is the <declare-styleable> element. This allows you to define attributes a custom view can use. You do this by specif...
What does void* mean and how to use it?
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10 Answers
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