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Why does Double.NaN==Double.NaN return false?
...ality predicates are non-signaling so x = x returning false can be used to test if x is a quiet NaN.
Java treats all NaN as quiet NaN.
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libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...www.vimer.cn
# Email: dantezhu@vip.qq.com
# FileName: test_download.cpp
# Version: 1.0
# LastChange: 2010-03-09 14:20:44
# Description:
# History:
============================================*/
#include <iostream>
#include <string>
#include...
Splitting string into multiple rows in Oracle
...y (also with regexp and connect by):
with temp as
(
select 108 Name, 'test' Project, 'Err1, Err2, Err3' Error from dual
union all
select 109, 'test2', 'Err1' from dual
)
select distinct
t.name, t.project,
trim(regexp_substr(t.error, '[^,]+', 1, levels.column_value)) as error
from ...
xpath find if node exists
...
<xsl:if test="xpath-expression">...</xsl:if>
so for example
<xsl:if test="/html/body">body node exists</xsl:if>
<xsl:if test="not(/html/body)">body node missing</xsl:if>
...
How to “test” NoneType in python?
... None in it or not.
Quoting from is docs,
The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. x is not y yields the inverse truth value.
Since there can be only one instance of None, is would be the preferred way to check None.
H...
Is using a lot of static methods a bad thing?
...hod mutates global state, or proxies to a global object, or some other non-testable behavior. These are throwbacks to procedural programming and should be refactored if at all possible.
There are a few common uses of "unsafe" statics -- for example, in the Singleton pattern -- but be aware that de...
Check if a JavaScript string is a URL
...ring
'(\\#[-a-z\\d_]*)?$','i'); // fragment locator
return !!pattern.test(str);
}
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Should logger be private static or not
...er inside the class you are going to have a devil of a time with your unit tests. You are writing unit tests aren't you?
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How do I clone a subdirectory only of a Git repository?
...
git clone --filter from git 2.19 now works on GitHub (tested 2020-09-18, git 2.25.1)
This option was added together with an update to the remote protocol, and it truly prevents objects from being downloaded from the server.
E.g., to clone only objects required for d1 of this rep...
How to create a file in Android?
...ile...
try {
// catches IOException below
final String TESTSTRING = new String("Hello Android");
/* We have to use the openFileOutput()-method
* the ActivityContext provides, to
* protect your file from others and
* This is done for security-reasons.
...