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What are some uses of decltype(auto)?
...generic code
For non-generic code, like the initial example you gave, you can manually select to get a reference as a return type:
auto const& Example(int const& i)
{
return i;
}
but in generic code you want to be able to perfectly forward a return type without knowing whether you...
Maven: how to override the dependency added by a library
...
it's not clear how I can specify the version since I don't declare a dependency on D. Also, the first link you provided has "This document describes the rest of the requirements for dependency management that have NOT yet been implemented for Mav...
Understanding the difference between __getattr__ and __getattribute__
...bute would become getattr(instance, attribute_name). Using this model, we can get the attribute by supplying the attribute_name as a string.
Use of __getattr__
You can also tell a class how to deal with attributes which it doesn't explicitly manage and do that via __getattr__ method.
Python will...
How can I recover a lost commit in Git?
...s your friend. Find the commit that you want to be on in that list and you can reset to it (for example:git reset --hard e870e41).
(If you didn't commit your changes... you might be in trouble - commit early, and commit often!)
...
Setup RSpec to test a gem (not Rails)
...the added generator of rspec-rails to setup RSpec for testing a Rails application. But how about adding RSpec for testing a gem in development?
I am not using jeweler or such tools. I just used Bundler ( bundle gem my_gem ) to setup the structure for the new gem and edit the *.gemspec manually.
I al...
Does JavaScript have “Short-circuit” evaluation?
...uit" evaluation.
if (true == true || foo.foo){
// Passes, no errors because foo isn't defined.
}
Live DEMO
if (false && foo.foo){
// Passes, no errors because foo isn't defined.
}
Live DEMO
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...
OSGi, Java Modularity and Jigsaw
...
First understand that Jigsaw's primary use case is to modularise the JRE itself. As a secondary goal it will offer a module system that may be used by other Java libraries and applications.
My position is that something like Jigsaw is probably necessary for the JRE o...
How to change the default charset of a MySQL table?
... this change for all tables that are not encoded in ut8 in a database, you can use this query and execute the resulted queries : SELECT concat('alter table ', table_name, ' CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;') FROM information_schema.tables WHERE table_schema='<your_databas...
How to change a module variable from another module?
...luted with three layers but bar.a = 1 changes the value of a in the module called bar that is actually derived from __init__.py. It does not change the value of a that foobar sees because foobar lives in the actual file bar.py. You could set bar.bar.a if you wanted to change that.
This is one of th...
What are WSGI and CGI in plain English?
...t into it. Each request results in a specific function in the script being called, with the request environment passed as arguments to the function.
CGI runs the script as a separate process each request and uses environment variables, stdin, and stdout to "communicate" with it.
...