大约有 30,000 项符合查询结果（耗时：0.0269秒） [XML]
How does database indexing work? [closed]
...iven that creating an index requires additional disk space (277,778 blocks extra from the above example, a ~28% increase), and that too many indices can cause issues arising from the file systems size limits, careful thought must be used to select the correct fields to index.
Since indices are only...
iterating over each character of a String in ruby 1.8.6 (each_char)
...y and currently trying to operate on each character separately from a base String in ruby. I am using ruby 1.8.6 and would like to do something like:
...
Random string generation with upper case letters and digits
I want to generate a string of size N.
31 Answers
31
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LPCSTR, LPCTSTR and LPTSTR
...To answer the first part of your question:
LPCSTR is a pointer to a const string (LP means Long Pointer)
LPCTSTR is a pointer to a const TCHAR string, (TCHAR being either a wide char or char depending on whether UNICODE is defined in your project)
LPTSTR is a pointer to a (non-const) TCHAR string...
Why is String.chars() a stream of ints in Java 8?
In Java 8, there is a new method String.chars() which returns a stream of int s ( IntStream ) that represent the character codes. I guess many people would expect a stream of char s here instead. What was the motivation to design the API this way?
...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...7
p1 = ffbff31c
Bus error
In both cases, the program is compiled with no extra options, just gcc packed.c -o packed.
(A program that uses a single struct rather than array doesn't reliably exhibit the problem, since the compiler can allocate the struct on an odd address so the x member is properl...
libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...========================================*/
#include <iostream>
#include <string>
#include <vector>
#include <map>
#include “curl/curl.h”
using namespace std;
static char errorBuffer[CURL_ERROR_SIZE];
static int writer(char *, size_t, size_t, string *);
static bool init(CURL *&, char *,s...
Is there any JSON Web Token (JWT) example in C#?
...turn sha.ComputeHash(value); } } }
};
}
public static string Encode(object payload, string key, JwtHashAlgorithm algorithm)
{
return Encode(payload, Encoding.UTF8.GetBytes(key), algorithm);
}
public static string Encode(object payload, byte[] keyBytes, JwtHa...
How to raise a ValueError?
... have this code which finds the largest index of a specific character in a string, however I would like it to raise a ValueError when the specified character does not occur in a string.
...
Regexp Java for password validation
...[@#$%^&+=])(?=\S+$).{8,}$
Explanation:
^ # start-of-string
(?=.*[0-9]) # a digit must occur at least once
(?=.*[a-z]) # a lower case letter must occur at least once
(?=.*[A-Z]) # an upper case letter must occur at least once
(?=.*[@#$%^&+=]) # a special ...