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Is it safe to delete a NULL pointer?
...e by default was setting the parameter to NULL like in
#define my_delete(x) {delete x; x = NULL;}
(I know about R and L values, but wouldn't it be nice?)
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Including a .js file within a .js file [duplicate]
...ally do like this, create new element and attach that to <head>
var x = document.createElement('script');
x.src = 'http://example.com/test.js';
document.getElementsByTagName("head")[0].appendChild(x);
You may also use onload event to each script you attach, but please test it out, I am not ...
Progress indicator during pandas operations
I regularly perform pandas operations on data frames in excess of 15 million or so rows and I'd love to have access to a progress indicator for particular operations.
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Reset local repository branch to be just like remote repository HEAD
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Setting your branch to exactly match the remote branch can be done in two steps:
git fetch origin
git reset --hard origin/master
If you want to save your current branch's state before doing this (just in case), you can do:
git commit -a -m "Saving ...
When to use %r instead of %s in Python? [duplicate]
On Learn Python the Hard Way page 21, I see this code example:
4 Answers
4
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How to keep up with the latest versions of Node.js in Ubuntu? PPA? Compiling?
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You could also use tools like for example nvm which can help you install node and even have multiple versions.
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adding header to python requests module
... do this to set a header for all future gets for the Session object, where x-test will be in all s.get() calls:
s = requests.Session()
s.auth = ('user', 'pass')
s.headers.update({'x-test': 'true'})
# both 'x-test' and 'x-test2' are sent
s.get('http://httpbin.org/headers', headers={'x-test2': 'true...
What's the difference between :: (double colon) and -> (arrow) in PHP?
...get method is not declared as static and
there is a compatible object context at the time of the call, meaning these must be true:
the call is made from a context where $this exists and
the class of $this is either the class of the method being called or a subclass of it.
Example:
class A {
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What's the difference between integer class and numeric class in R
...to preface this by saying I'm an absolute programming beginner, so please excuse how basic this question is.
4 Answers
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std::unique_ptr with an incomplete type won't compile
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Here are some examples of std::unique_ptr with incomplete types. The problem lies in destruction.
If you use pimpl with unique_ptr, you need to declare a destructor:
class foo
{
class impl;
std::unique_ptr<impl> impl_;
pub...