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PostgreSQL Autoincrement
...other integer data type, such as smallint.
Example :
CREATE SEQUENCE user_id_seq;
CREATE TABLE user (
user_id smallint NOT NULL DEFAULT nextval('user_id_seq')
);
ALTER SEQUENCE user_id_seq OWNED BY user.user_id;
Better to use your own data type, rather than user serial data type.
...
Is it safe to parse a /proc/ file?
... missing in what you see. To see that it's atomic for one read(), look at m_start() in fs/namespace.c and see it grab a semaphore that guards the list of mountpoints, which it keeps until m_stop(), which is called when the read() is done. To see what can go wrong, see this bug from last year (same ...
printf with std::string?
... for some reason, you need to extract the C-style string, you can use the c_str() method of std::string to get a const char * that is null-terminated. Using your example:
#include <iostream>
#include <string>
#include <stdio.h>
int main()
{
using namespace std;
string my...
How do I terminate a thread in C++11?
...esign such a feature.
A std::thread may have this member function:
native_handle_type native_handle();
You might be able to use this to call an OS-dependent function to do what you want. For example on Apple's OS's, this function exists and native_handle_type is a pthread_t. If you are success...
ssl_error_rx_record_too_long and Apache SSL [closed]
...er trying to access one of my sites, and they keep getting this error > ssl_error_rx_record_too_long
15 Answers
...
Hide the cursor of an UITextField
...irst, store the text field's selected text range to an instance variable.
_textFieldSelectedTextRange = textField.selectedTextRange;
textField.selectedTextRange = nil; // hides caret
Then, when you want to unhide the caret, simply set the text field's selected text range back to what it was origi...
Can I change multiplier property for NSLayoutConstraint?
...them, since "Activating or deactivating the constraint calls addConstraint(_:) and removeConstraint(_:) on the view that is the closest common ancestor of the items managed by this constraint".
– qix
Jan 4 '17 at 5:26
...
Difference between private, public, and protected inheritance
...rts the same control on external access.
– underscore_d
Feb 27 '16 at 18:28
2
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windows C++ gbk转为utf-8 - C/C++ - 清泛网 - 专注C/C++及内核技术
...码转换为linux使用的utf8格式的，否则会出现乱码。
//m_string是windows下的中文字符串
//utf8_string是返回转换为utf8编码的中文字符串
//slen是utf8_string字符数组的大小
int multichar_2_utf8(const char *m_string,char *utf8_string,int slen) {
int le...
Android存储系统基础知识：内部存储，外部存储，App特定目录 ASD(app speci...
...r
file:///storage/emulated/0/
要访问外部存储，需要 READ_ 或 WRITE_EXTERNAL_STORAGE 权限。
App特定目录 ASD(App-specific directory)
此外，可能还有一个特定于应用程序的目录（ASD），可以使用以下命令创建
Tai...