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How many GCC optimization levels are there?
... while maintaining fast compilation and a good debugging experience.)
-Os (Optimize for size. -Os enables all -O2 optimizations that do not typically increase code size. It also performs further optimizations
designed to reduce code size.
-Os disables the following optimization flags: -falign-fu...
Node.js - Find home directory in platform agnostic way
... recent answer, the preferred way is now simply:
const homedir = require('os').homedir();
[Original Answer]: Why not use the USERPROFILE environment variable on win32?
function getUserHome() {
return process.env[(process.platform == 'win32') ? 'USERPROFILE' : 'HOME'];
}
...
Python: Making a beep noise
...
Or def sos(): for i in range(0, 3): winsound.Beep(2000, 100) for i in range(0, 3): winsound.Beep(2000, 400) for i in range(0, 3): winsound.Beep(2000, 100). I should probably go ba...
Redirect stdout pipe of child process in Go
...hing more interesting
cmd := exec.Command("ls", "-l")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Run()
}
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Total memory used by Python process?
... for various operating systems, including Linux, Windows 7, etc.:
import os
import psutil
process = psutil.Process(os.getpid())
print(process.memory_info().rss) # in bytes
On my current Python 2.7 install with psutil 5.6.3, the last line should be
print(process.memory_info()[0])
instead (t...
How do I get the name of the active user via the command line in OS X?
How do I get the name of the active user via the command line in OS X?
12 Answers
12
...
How to check whether a file or directory exists?
...or directory exists
func exists(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil { return true, nil }
if os.IsNotExist(err) { return false, nil }
return false, err
}
Edited to add error handling.
...
硬盘最神秘的功能，万万想不到 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...些不可告人的重要数据。
6根自行车辐条。
找来一个很高级的铁盒盒。
这种办法可以很轻松的确定其重心~
用圆规划一个圈，定位打孔~
然后在盒盒侧边给它扎上几针。
居然把磁盘拆了下来！3.5寸的大家伙，...
BMP 和 DIB - C/C++ - 清泛网 - 专注C/C++及内核技术
...
3. 调色板
用于说明位图中的颜色，它有若干个表项，每一个表项是一个RGBQUAD类型的结构，定义一种颜色。RGBQUAD结构的定义如下：
颜色表中RGBQUAD结构数据的个数有biBitCount来确定：
当biBitCount=1,4,8时，分别有2,16,256个表项；...
VC/MFC 临界区域使用方法实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...问，实现线程的同步操作。保证只能由先进入临界区域的一个线程...临界区域的作用：避免临界区域内的数据(一般为共享的资源)被不同的线程同时访问，实现线程的同步操作。保证只能由先进入临界区域的一个线程访问结束后...