大约有 15,640 项符合查询结果（耗时：0.0220秒） [XML]
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...效，否则填完以下install配置后，会出现错误"bin/postconf: error while loading shared libraries: libmysqlclient.so.18: cannot open shared object file: No such file or directory"。
若postfix报错postfix: fatal: parameter inet_interfaces: no local interface found for ::1
则 vi /et...
What does this square bracket and parenthesis bracket notation mean [first1,last1)?
... Pascal are one-based.
These differences can lead to subtle fence post errors, aka, off-by-one bugs when implementing Mathematical algorithms such as for-loops.
Integers
If we have a set or array, say of the first few primes [ 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 ], Mathematicians would refer t...
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:...