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C# 'is' operator performance
...ox 57 milliseconds, and the enum comparison coming in at 29 milliseconds.
NB I'd still prefer the is check, the difference is too small to care about
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Wrap a delegate in an IEqualityComparer
...Func<T, T, bool> comparer )
: this( comparer, t => 0 ) // NB Cannot assume anything about how e.g., t.GetHashCode() interacts with the comparer's behavior
{
}
public FuncEqualityComparer( Func<T, T, bool> comparer, Func<T, int> hash )
{
_comparer...
How can I display just a portion of an image in HTML/CSS?
...ip: rect(0, 100px, 200px, 0);
/* clip: shape(top, right, bottom, left); NB 'rect' is the only available option */
}
<div class="container">
<img src="http://lorempixel.com/200/200/nightlife/3" />
</div>
<div class="container">
<img id="clip" src="http://loremp...
What is external linkage and internal linkage?
...ier static affects the lifetime of the local variable and not its scope.
NB: The keyword static plays a double role. When used in the definitions of global variables, it specifies internal linkage. When used in the definitions of the local variables, it specifies that the lifetime of the variable ...
What is the proper declaration of main?
...
NB. I posted this answer as in comments to another thread, someone tried to cite this thread as evidence that int main(void) was not correct in C++.
– M.M
Jul 1 '17 at 9:22
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蜘蛛的故事 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...蛛便有了佛性。经过了一千多年的修炼,蛛蛛佛性增加了不少。
忽然有一天,佛主光临了圆音寺,看见这里香火甚旺,十分高兴。离开寺庙的时候,不轻易间地抬头,看见了横梁上的蛛蛛。佛主停下来,问这只蜘蛛:“你我...
Ubuntu下CodeBlock开发环境配置 - C/C++ - 清泛网 - 专注C/C++及内核技术
...觉功能比较强大,API使用比MFC简单,对Linux编程感兴趣的不妨试试(当然Linux下编程选择还是比较广泛的,OpenGL、wxWidgets、GTK等)。Qt4的安装过程如下:
sudo apt-get install libqt4-dev libqt4-debug libqt4-gui libqt4-sql qt4-dev-tools qt4-doc qt4-desi...
半个汉字的校验与处理(C++) - C/C++ - 清泛网 - 专注C/C++及内核技术
半个汉字的校验与处理(C++)由于汉字是2个字符(这里不讨论可变字符的情形),因此,在C语言中,用一个固定长度的buffer 存放包含汉字的字符串,就有汉字被截断从而导致...由于汉字是2个字符(这里不讨论可变字符的情形),因此...
由“Pure Virtual Function Called” 考虑到的 - C/C++ - 清泛网 - 专注C/C++及内核技术
...会修改对象的虚函数表指针值 一般情况下(特指基类不使用novtable属性),debug编译出 1. 派生类对象析构时,基类析构函数执行的前期会修改对象的虚函数表指针值
一般情况下(特指基类不使用novtable属性),debug编译...
CDC:DrawText 多行显示文本(文本自动换行) - C/C++ - 清泛网 - 专注C/C++及内核技术
...符,上述任何一种情况,DrawText返回格式化正文的高度而不是写正文。
DT_CENTER:使正文在矩形中水平居中。
DT_EDITCONTROL:复制多行编辑控制的正文显示特性,特殊地,为编辑控制的平均字符宽度是以同样的方法计算的...
