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C++11 rvalues and move semantics confusion (return statement)
..._ref = return_vector();
In the second example you have created a run time error. rval_ref now holds a reference to the destructed tmp inside the function. With any luck, this code would immediately crash.
Third example
std::vector<int> return_vector(void)
{
std::vector<int> tmp {1...
How to write a large buffer into a binary file in C++, fast?
...final buffer flush), which should write to disk the last portion of data.
Error handling.
While the code start filling 2nd buffer, and the 1st one is being written on a separate thread, but write fails for some reason, the main thread should be aware of that failure.
------------------------------...
Why can't the C# constructor infer type?
...d not be unambiguously determined which was intended then we could give an error. This is the same as any other overload resolution problem; if insufficient information is supplied then we simply give an error.
– Eric Lippert
Aug 25 '10 at 21:32
...
What's wrong with nullable columns in composite primary keys?
...ons the designer likely did not intend, which is why many systems throw an error when you try this.
Consider the case of module/package versions stored as a series of fields:
CREATE TABLE module
(name varchar(20) PRIMARY KEY,
description text DEFAULT '' NOT NULL);
CREATE TABLE version...
HEAD and ORIG_HEAD in Git
...ems with multiple commits, like running 'git am' on the wrong branch or an error in the commits that is more easily fixed by changing the mailbox (e.g. +errors in the "From:" lines).
In addition, merge always sets '.git/ORIG_HEAD' to the original state of HEAD so a problematic merge can be remo...
In Visual Studio C++, what are the memory allocation representations?
...loc(LMEM_FIXED) to mark uninitialised allocated heap memory
* 0xBADCAB1E : Error Code returned to the Microsoft eVC debugger when connection is severed to the debugger
* 0xBEEFCACE : Used by Microsoft .NET as a magic number in resource files
* 0xCCCCCCCC : Used by Microsoft's C++ debugging runtime l...
Python Infinity - Any caveats?
...back (most recent call last):
File "<stdin>", line 1, in ?
OverflowError: (34, 'Numerical result out of range')
The inf value is considered a very special value with unusual semantics, so it's better to know about an OverflowError straight away through an exception, rather than having an i...
Is there a difference between copy initialization and direct initialization?
...= (A)1; // OK: explicit cast performs static_cast
// B b1 = 1; // error: copy-initialization does not consider B::B(int)
B b2(2); // OK: direct-initialization selects B::B(int)
B b3 {4, 5}; // OK: direct-list-initialization selects B::B(int, int)
// B b4 = {4, 5}; // error:...
Which characters make a URL invalid?
...
This answer isn't bad, but there are some confusions and errors. You initially conflate disallowed and reserved characters (very different things), you make too much of the distinction between "unwise" characters and other disallowed characters (dropped in RFC 3986 and syntacticall...
What are the disadvantages of using persistent connection in PDO
... happened seemingly at random. It turned out that those once-a-week fatal errors that our users diligently squeezed out of our app were leaving locked tables, abandoned transactions and other unfortunate wonky states.
This sob-story has a point: It broke things that we never expected to break, all...