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What is the difference between “#!/usr/bin/env bash” and “#!/usr/bin/bash”?
...t more portable, but also increases the risk that the wrong interpreter is selected because it searches for a match in every directory on the executable search path. It also suffers from the same problem in that the path to the env binary may also be different on a per-machine basis."-Wikipedia
...
Is a `=default` move constructor equivalent to a member-wise move constructor?
... remains in the overload set, and the program is ill-formed if it would be selected. When it is implicitly deleted, it is removed from the overload set. See Deleted implicitly-declared move constructor
– Caleth
Oct 3 '18 at 11:18
...
MongoDB Many-to-Many Association
...ey use their own N1QL. This is an example of a JOIN from their tutorials:
SELECT usr.personal_details, orders
FROM users_with_orders usr
USE KEYS "Elinor_33313792"
JOIN orders_with_users orders
ON KEYS ARRAY s.order_id FOR s IN usr.shipped...
What is the dependency inversion principle and why is it important?
...l never be able to deploy his application without the logging library John selected. If John follows the DIP, however, Sam is free to provide an adapter and use whatever logging library he chooses. The DIP isn't about convenience, but coupling.
– Derek Greer
...
What are the most widely used C++ vector/matrix math/linear algebra libraries, and their cost and be
...s criteria, but if maturity were the only metric, I imagine you would have selected a BLAS or LAPACK based option.
– Catskul
Sep 9 '09 at 17:54
...
How does the compilation/linking process work?
... is usually just declarations), doing replacement of macros (#define), and selecting different portions of text depending of #if, #ifdef and #ifndef directives.
The preprocessor works on a stream of preprocessing tokens. Macro substitution is defined as replacing tokens with other tokens (the opera...
Break a previous commit into multiple commits
...g git reset HEAD~, go through the patches individually using git add -p to select the ones you want in each commit
Edit the working copy to remove the changes you do not want; commit that interim state; and then pull back the full commit for the next round.
Option 2 is useful if you're splitting a...
ServiceStack vs ASP.Net Web API [closed]
...solveService<T>() method which returns an auto-wired instance of the selected service as seen in the Nortwind CustomerDetails Service example:
var ordersService = base.ResolveService<OrdersService>();
var ordersResponse = (OrdersResponse)ordersService.Get(
new Orders { CustomerId = ...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...h
. $real_path
用户输入
执行脚本时传入脚本运行中输入select菜单stdin和stdout
常用的命令
sh脚本结合系统命令便有了强大的威力，在字符处理领域，有grep、awk、sed三剑客，grep负责找出特定的行，awk能将行拆分成多个字段，s...
Update relationships when saving changes of EF4 POCO objects
...ategories" is an IEnumerable containing the IDs of the categories the user selected in the view.
db.Entry(dataobj).State = EntityState.Modified;
db.SaveChanges();
dataobj = db.ServiceTypes.Include(x => x.Categories).Single(x => x.Id == dataobj.Id);
var it = _categories != null...