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When to use ref and when it is not necessary in C#
...ions that I pass the object to to modify the state. I have been passing it by ref to the worker functions. However I came across the following function.
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Generating statistics from Git repository [closed]
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Beside GitStats (git history statistics generator) mentioned by xyld, written in Python and requiring Gnuplot for graphs, there is also
gitstat (SourceForge) project (web-based git statistics interface), written in PHP and Perl,
Git Statistics, aka gitstats (metrics framework designed...
What is a stack trace, and how can I use it to debug my application errors?
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at com.example.myproject.Bootstrap.main(Bootstrap.java:14)
Caused by: java.lang.NullPointerException
at com.example.myproject.Book.getId(Book.java:22)
at com.example.myproject.Author.getBookIds(Author.java:36)
... 1 more
What's different about this one is the "Caus...
MongoDB SELECT COUNT GROUP BY
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how do you group sort to it? I want to sort count by -1
– Filip Bartuzi
Jun 26 '17 at 15:19
4
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C++ - passing references to std::shared_ptr or boost::shared_ptr
...p points to an object that cannot be destroyed during this function
}
So by using a reference to a shared_ptr, you disable that guarantee. So in your second case:
Class::only_work_with_sp(boost::shared_ptr<foo> &sp) //Again, no copy here
{
...
sp->do_something();
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Should I pass an std::function by const-reference?
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If you want performance, pass by value if you are storing it.
Suppose you have a function called "run this in the UI thread".
std::future<void> run_in_ui_thread( std::function<void()> )
which runs some code in the "ui" thread, then signals...
Delete all data in SQL Server database
...ECT TOP 1 [name] FROM sysobjects WHERE [type] = 'P' AND category = 0 ORDER BY [name])
WHILE @name is not null
BEGIN
SELECT @SQL = 'DROP PROCEDURE [dbo].[' + RTRIM(@name) +']'
EXEC (@SQL)
PRINT 'Dropped Procedure: ' + @name
SELECT @name = (SELECT TOP 1 [name] FROM sysobjects WHERE [t...
How to delete a row by reference in data.table?
My question is related to assignment by reference versus copying in data.table . I want to know if one can delete rows by reference, similar to
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Get object by id()? [duplicate]
Let's say I have an id of a Python object, which I retrieved by doing id(thing) . How do I find thing again by the id number I was given?
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使用 XML 和 Web 服务 · App Inventor 2 中文网
...XML, it will signal an error and return the empty list.
The list returned by XMLTextDecode contains one pair for each top-level tag-delimited structure in the input string. For example, decoding
123
returns the list of one pair (hello, 123) and decoding
123
456
returns the list of two pair...