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How to port data-only volumes from one host to another?
... data with tar on the second machine. This does not rely on implementation details of the volumes.
# you can list shared directories of the data container
docker inspect <data container> | grep "/vfs/dir/"
# you can export data container directory to tgz
docker run --cidfile=id.tmp --volumes...
What does gcc's ffast-math actually do?
...at is really happening when it's on. Can anyone please explain some of the details and maybe give a clear example of how something would change if the flag was on or off?
...
Master-master vs master-slave database architecture?
...Blog full breakdown including architecture diagrams that goes into further details about the 3 mentioned architectures.
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Why declare unicode by string in python?
...but no
encoding declared; see http://www.python.org/peps/pep-0263.html for details
Output of file with # coding: cp437 added:
über '\x81ber'
über u'\xfcber'
At first, Python didn't know the encoding and complained about the non-ASCII character. Once it knew the encoding, the byte string got ...
In plain English, what does “git reset” do?
...is a pointer to a commit) to point to a different commit. The rest is just details of what happens to your index and work tree.
Use cases
I cover many of the main use cases for git reset within my descriptions of the various options in the next section. It can really be used for a wide variety of ...
call a static method inside a class?
...
This is a very late response, but adds some detail on the previous answers
When it comes to calling static methods in PHP from another static method on the same class, it is important to differentiate between self and the class name.
Take for instance this code:
cla...
Guaranteed lifetime of temporary in C++?
...ally good blog post from the MSVC team on that walks through this in great detail and I encourage folks to read it.
The pedagogical example for moving rvalue's is temporary strings and I'll show assignment in a constructor. If I have a class MyType that contains a string member variable, it can be...
Find which commit is currently checked out in Git
...sh prompt.
git status.
git bisect visualize.
I'll explain each option in detail below.
Option 1: git show
As explained in this answer to the general question of how to determine which commit you currently have checked-out (not just during git bisect), you can use git show with the -s option to ...
Templated check for the existence of a class member function?
...;
template<class>
struct sfinae_true : std::true_type{};
namespace detail{
template<class T, class A0>
static auto test_stream(int)
-> sfinae_true<decltype(std::declval<T>().stream(std::declval<A0>()))>;
template<class, class A0>
static auto tes...
What is the Scala identifier “implicitly”?
... in Scala, and definitely worthy of proper explanation. Thinking that docs detailing only a type-signature count seems more like intellectual self-gratification, than a genuine answer. See the specific questions asked by the OP -- what is it, and how is it used? Neither answered by this, or in the n...