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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...简单化一下代码：
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struct test{
int i;
char *p;
};
上面代码中，test结构中i和p指针，在C的编译器中保存的是相对地址——也就是说，他们的地址是相对于struct test的实例的。如果...
What are some compelling use cases for dependent method types?
... def duplicates(r : Resource) : Boolean
}
def create : Resource
// Test methods: exercise is to move them outside ResourceManager
def testHash(r : Resource) = assert(r.hash == "9e47088d")
def testDuplicates(r : Resource) = assert(r.duplicates(r))
}
trait FileManager extends ResourceMa...
What tools to automatically inline CSS style to create email HTML code? [closed]
...ct.ca is great, but it chokes on a lot of pages. It's more than half in my testing. For example, try this page.
– Nick Woodhams
Dec 27 '12 at 0:17
...
Are tuples more efficient than lists in Python?
...u might expect tuples to be slightly faster. However you should definitely test your specific case (if the difference might impact the performance of your program -- remember "premature optimization is the root of all evil").
Python makes this very easy: timeit is your friend.
$ python -m timeit ...
Java Map equivalent in C#
...","world");
...
Console.Writeline(example["hello"]);
An efficient way to test/get values is TryGetValue (thanx to Earwicker):
if (otherExample.TryGetValue("key", out value))
{
otherExample["key"] = value + 1;
}
With this method you can fast and exception-less get values (if present).
Reso...
using gitlab token to clone without authentication
... of tokens:
Private token
Personal Access Token
CI/CD running token
I tested only the Personal Access Token using GitLab Community Edition 10.1.2, the example:
git clone https://gitlab-ci-token:${Personal Access Tokens}@gitlab.com/username/myrepo.git
git clone https://oauth2:${Personal Acces...
Merge two (or more) lists into one, in C# .NET
...
@MarcCliment: Well for one thing, in your tests you're not creating the list with the correct final size - whereas the code in my answer does. Do that, and the 10000*10000 test is faster using AddRange, at least - although other results are inconsistent. (You should ...
How do I invoke a Java method when given the method name as a string?
...mport java.lang.reflect.Method;
import org.junit.Assert;
import org.junit.Test;
public class ReflectionTest {
private String methodName = "length";
private String valueObject = "Some object";
@Test
public void testGetMethod() throws SecurityException, NoSuchMethodException, Illeg...
如何查看Oracle用户的SQL执行历史记录？ - 数据库(内核) - 清泛网 - 专注C/...
...le();
PL/SQL procedure successfully completed.
$ cd $ORACLE_HOME/admin/test/udump
$ ls -lrt
$ tkprof test_ora_2195620.trc report.txt sys=no explain=no aggregate=yes
$ more report.txt --这个文件包括了启停trace之间所有SQL语句的执行信息，执行计划、统计
【...
PostgreSQL return result set as JSON array?
...
or combine json_agg with a cast:
SELECT json_agg(t)::jsonb FROM t
My testing suggests that aggregating them into an array first is a little faster. I suspect that this is because the cast has to parse the entire JSON result.
9.2
9.2 does not have the json_agg or to_json functions, so you nee...