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Useful GCC flags for C
...to catch all kinds of dangling pointers.
http://gcc.gnu.org/wiki/Mudflap_Pointer_Debugging
Here's a demo:
$ cat mf.c
int main()
{
int a[10];
a[10]=1; // <-- o noes, line 4
}
$ gcc -fmudflap mf.c -lmudflap
$ ./a.out
*******
mudflap violation 1 (check/write): time=1280862302.170759 ptr=...
How to set the authorization header using curl
... send authentication for OAuth 2:
curl -H "Authorization: OAuth <ACCESS_TOKEN>" http://www.example.com
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Is it smart to replace boost::thread and boost::mutex with c++11 equivalents?
...not
C++11 supports std::async, but Boost does not
Boost has a boost::shared_mutex for multiple-reader/single-writer locking. The analogous std::shared_timed_mutex is available only since C++14 (N3891), while std::shared_mutex is available only since C++17 (N4508).
C++11 timeouts are different to Boo...
Targeting only Firefox with CSS
...nger works as of Firefox 59, released March 2018: bugzilla.mozilla.org/show_bug.cgi?id=1035091
– Jordan Gray
Dec 17 '19 at 17:16
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How to execute a raw update sql with dynamic binding in rails
...using it's methods, e.g. for MySQL:
st = ActiveRecord::Base.connection.raw_connection.prepare("update table set f1=? where f2=? and f3=?")
st.execute(f1, f2, f3)
st.close
I'm not sure if there are other ramifications to doing this (connections left open, etc). I would trace the Rails code for a n...
How do I auto size a UIScrollView to fit its content
...
Or just do: int y = CGRectGetMaxY(((UIView*)[_scrollView.subviews lastObject]).frame); [_scrollView setContentSize:(CGSizeMake(CGRectGetWidth(_scrollView.frame), y))];
– Gal
Jul 10 '13 at 13:33
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How do I set the size of Emacs' window?
...n toggle-fullscreen ()
(interactive)
(x-send-client-message nil 0 nil "_NET_WM_STATE" 32
'(2 "_NET_WM_STATE_MAXIMIZED_VERT" 0))
(x-send-client-message nil 0 nil "_NET_WM_STATE" 32
'(2 "_NET_WM_STATE_MAXIMIZED_HORZ" 0))
)
(toggle-fullscreen)
...
How to check whether a string is Base64 encoded or not
... for PHP5
//where $json is some data that can be base64 encoded
$json=some_data;
//this will check whether data is base64 encoded or not
if (base64_decode($json, true) == true)
{
echo "base64 encoded";
}
else
{
echo "not base64 encoded";
}
Use this for PHP7
//$strin...
What's the difference between assignment operator and copy constructor?
...tialized object from some other object's data.
A(const A& rhs) : data_(rhs.data_) {}
For example:
A aa;
A a = aa; //copy constructor
An assignment operator is used to replace the data of a previously initialized object with some other object's data.
A& operator=(const A& rhs) {...
Apache not starting on MAMP Pro
.... Go to bin -> apache2 -> bin.
Then rename the file from envvars to _envvars.
I also came across another problem of it not working correctly. Make sure the ports are Apache defaults, NOT MAMP defaults (port 80 etc). If it works straight away, this should not apply to you.
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