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Checking for NULL pointer in C/C++ [closed]
...
if (foo) is clear enough. Use it.
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A python class that acts like dict
...ode__(self):
return unicode(repr(self.__dict__))
o = Mapping()
o.foo = "bar"
o['lumberjack'] = 'foo'
o.update({'a': 'b'}, c=44)
print 'lumberjack' in o
print o
In [187]: run mapping.py
True
{'a': 'b', 'lumberjack': 'foo', 'foo': 'bar', 'c': 44}
...
How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators dif
..." is a string
1 == "1": true // "1" gets casted to an integer, which is 1
"foo" === "foo": true // both operands are strings and have the same value
Warning: two instances of the same class with equivalent members do NOT match the === operator. Example:
$a = new stdClass();
$a->foo = "bar";
$b ...
How to print to stderr in Python?
...; print("Test")
Test
>>> eprint("Test")
Test
>>> eprint("foo", "bar", "baz", sep="---")
foo---bar---baz
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MVC Razor view nested foreach's model
...='SomeProperty'>.
For a more complicated example, like model=>model.Foo.Bar.Baz.FooBar, it might generate <input name="Foo.Bar.Baz.FooBar" value="[whatever FooBar is]" />
Make sense? It is not just the work that the Func<> does, but how it does its work is important here.
(Note ...
Passing parameters to a Bash function
... you need to call your function after it is declared.
#!/usr/bin/env sh
foo 1 # this will fail because foo has not been declared yet.
foo() {
echo "Parameter #1 is $1"
}
foo 2 # this will work.
Output:
./myScript.sh: line 2: foo: command not found
Parameter #1 is 2
Reference: Advanced...
How can I use xargs to copy files that have spaces and quotes in their names?
...
You can combine all of that into a single find command:
find . -iname "*foobar*" -exec cp -- "{}" ~/foo/bar \;
This will handle filenames and directories with spaces in them. You can use -name to get case-sensitive results.
Note: The -- flag passed to cp prevents it from processing files st...
Preserve line endings
...is will fix the problem with cygwin's sed on Windows.
Example: sed -b 's/foo/bar/'
If you wish to match the end of the line, remember to match, capture and copy the optional carriage return.
Example: sed -b 's/foo\(\r\?\)$/bar\1/'
From the sed man page:
-b --binary
This opti...
Using Build Flavors - Structuring source folders and build.gradle correctly
...two flavor you'll need to create it in both flavors.
src/flavor1/java/com/foo/A.java
src/flavor2/java/com/foo/A.java
And then your code in src/main/java can do
import com.foo.A
depending on the flavor selected, the right version of com.foo.A is used.
This also means both version of A must hav...
Given a class, see if instance has method (Ruby)
...since respond_to? restricts itself to public methods by default, as well.
Foo.public_instance_methods.include?('bar')
In Ruby 1.9, though, those methods return arrays of symbols.
Foo.public_instance_methods.include?(:bar)
If you're planning on doing this often, you might want to extend Module ...