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How to get my IP address programmatically on iOS/macOS?
...un0"
#define IP_ADDR_IPv4 @"ipv4"
#define IP_ADDR_IPv6 @"ipv6"
- (NSString *)getIPAddress:(BOOL)preferIPv4
{
NSArray *searchArray = preferIPv4 ?
@[ /*IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6,*/ IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6,...
How to count the number of set bits in a 32-bit integer?
...bit elements in a 64-bit integer with a 0x0101010101010101 multiplier, and extract the high byte with >>56. So it doesn't take any extra steps, just wider constants. This is what GCC uses for __builtin_popcountll on x86 systems when the hardware popcnt instruction isn't enabled. If you can ...
How can I split and trim a string into parts all on one line?
...
Try
List<string> parts = line.Split(';').Select(p => p.Trim()).ToList();
FYI, the Foreach method takes an Action (takes T and returns void) for parameter, and your lambda return a string as string.Trim return a string
Foreach...
Concatenate two string literals
...Koenig. He writes that "the new idea is that we can use + to concatenate a string and a string literal - or, for that matter, two strings (but not two string literals).
...
How to compare Unicode characters that “look alike”?
...e:
using System;
using System.Text;
class Program
{
static void Main(string[] args)
{
char first = 'μ';
char second = 'µ';
// Technically you only need to normalize U+00B5 to obtain U+03BC, but
// if you're unsure which character is which, you can safely ...
What's the best way to trim std::string?
I'm currently using the following code to right-trim all the std::strings in my programs:
46 Answers
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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
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#include <stdlib.h>
#include <string.h>
struct line {
int length;
char contents[0]; // C99的玩法是：char contents[]; 没有指定数组长度
};
int main(){
int this_length=10;
struct line *thisline = (struct line ...
Set custom HTML5 required field validation message
...for example when it's not a valid email address)
You can either assign a string or a function to each of the three properties.
If you assign a function, it can accept a reference to the input element (DOM node) and it must return a string which is then displayed as the error message.
Compatibili...
How to color System.out.println output? [duplicate]
...llowing will NOT color output in JavaScript in the Web Console
console.log(String.fromCharCode(27) + "[36mCYAN");
console.log("\x1b[30;47mBLACK_ON_WHITE");
Note that \x1b also works in node
In Shell Prompt OR Scripts
If you are working with bash or zsh, it is quite easy to color the output (i...
How to use sed to replace only the first occurrence in a file?
...o' with 'bar' in the first matching line only.
Due to use of ANSI C-quoted strings ($'...') to provide the sample input lines, bash, ksh, or zsh is assumed as the shell.
GNU sed only:
Ben Hoffstein's anwswer shows us that GNU provides an extension to the POSIX specification for sed that allows th...