大约有 40,000 项符合查询结果（耗时：0.0524秒） [XML]
C/C++ check if one bit is set in, i.e. int variable
...lation, you can write a macro:
#define CHECK_BIT(var,pos) ((var) & (1<<(pos)))
and use it this way to check the nth bit from the right end:
CHECK_BIT(temp, n - 1)
In C++, you can use std::bitset.
share
...
Favicon: .ico or .png / correct tags? [duplicate]
... is getting more and more support though as it is easier to create using multiple programs.
for .ico
<link rel="shortcut icon" href="http://example.com/myicon.ico" />
for .png, you need to specify the type
<link rel="icon" type="image/png" href="http://example.com/image.png" />
...
How to get the type of T from a member of a generic class or method?
... and that the list could be any type at runtime)
If you know it is a List<T>, then:
Type type = abc.GetType().GetGenericArguments()[0];
Another option is to look at the indexer:
Type type = abc.GetType().GetProperty("Item").PropertyType;
Using new TypeInfo:
using System.Reflection;
// ...
What new capabilities do user-defined literals add to C++?
...e to using user-defined literals instead of a constructor call:
#include <bitset>
#include <iostream>
template<char... Bits>
struct checkbits
{
static const bool valid = false;
};
template<char High, char... Bits>
struct checkbits<High, Bits...>
{
s...
Floating elements within a div, floats outside of div. Why?
...#parent { float: left; width: 100% }
Another way uses a clear element:
<div class="parent">
<img class="floated_child" src="..." />
<span class="clear"></span>
</div>
CSS
span.clear { clear: left; display: block; }
...
In log4j, does checking isDebugEnabled before logging improve performance?
...ion of the toString() methods of various objects and concatenating the results.
In the given example, the log message is a constant string, so letting the logger discard it is just as efficient as checking whether the logger is enabled, and it lowers the complexity of the code because there are few...
width:auto for fields
...r a display:block element meant 'fill available space'. However for an <input> element this doesn't seem to be the case. For example:
...
How to use the IEqualityComparer
...t required. AsEnumerable is also redundant here since processing the result in AddRange will cause this anyway.
1 Writing code without knowing what it actually does is called cargo cult programming. It’s a surprisingly widespread practice. It fundamentally doesn’t work.
...
What replaces cellpadding, cellspacing, valign, and align in HTML5 tables?
...
This should solve your problem:
td {
/* <http://www.w3.org/wiki/CSS/Properties/text-align>
* left, right, center, justify, inherit
*/
text-align: center;
/* <http://www.w3.org/wiki/CSS/Properties/vertical-align>
* baseline, sub, su...
How to check if element has any children in Javascript?
...
A reusable isEmpty( <selector> ) function.
You can also run it toward a collection of elements (see example)
const isEmpty = sel =>
![... document.querySelectorAll(sel)].some(el => el.innerHTML.trim() !== "");
console.log...