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How does deriving work in Haskell?
...hort answer is, magic :-). This is to say that automatic deriving is baked into the Haskell spec, and every compiler can choose to implement it in its own way. There's lots of work on how to make it extensible however.
Derive is a tool for Haskell to let you write your own deriving mechanisms.
GHC...
How to update SQLAlchemy row entry?
...ditions. Instead use user.no_of_logins = user.no_of_logins + 1. Translated into sql the latter correct way becomes: SET no_of_logins = no_of_logins + 1.
– ChaimG
Jul 14 '16 at 20:19
...
Waiting until two async blocks are executed before starting another block
...IGH, 0), ^ {
// block1
NSLog(@"Block1");
[NSThread sleepForTimeInterval:5.0];
NSLog(@"Block1 End");
});
dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
// block2
NSLog(@"Block2");
[NSThread sleepForTimeInterval:8.0];
NSLog(...
Why not abstract fields?
...cit to the class, so they'd be best served as fields, not something passed into the constructor.
– Adam Hughes
Jan 3 '17 at 21:46
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show 1 m...
How to reference style attributes from a drawable?
...you need to:
Create one XML drawable per theme.
Include the needed color into you drawable directly with the @color tag or #RGB format.
Make an attribute for your drawable in attrs.xml.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- Attributes must be lowercase ...
How do I set cell value to Date and apply default Excel date format?
...book wb = new XSSFWorkbook(inputStream);
Date date1=new Date();
Sheet xlsMainTable = (Sheet) wb.getSheetAt(0);
Row myRow= CellUtil.getRow(0, xlsMainTable);
CellUtil.getCell(myRow, 0).setCellValue(date1);
WHen the Excel is opened, the date is formatted correctly.
...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...描述符）去定位具体的拓扑：
/* Topology establishment */
int s = zmq_socket (...);
zmq_connect (s, "tcp://192.168.0.111:5555");
/* Message routing */
const char data [] = "ABC";
zmq_send (s, data, sizeof (data), 0);
区分拓扑建立和消息路由严格地说不是不可...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...描述符）去定位具体的拓扑：
/* Topology establishment */
int s = zmq_socket (...);
zmq_connect (s, "tcp://192.168.0.111:5555");
/* Message routing */
const char data [] = "ABC";
zmq_send (s, data, sizeof (data), 0);
区分拓扑建立和消息路由严格地说不是不可...
How to search a specific value in all tables (PostgreSQL)?
...y --inserts -U postgres your-db-name > a.tmp
$ grep United a.tmp
INSERT INTO countries VALUES ('US', 'United States');
INSERT INTO countries VALUES ('GB', 'United Kingdom');
The same utility, pg_dump, can include column names in the output. Just change --inserts to --column-inserts. That way yo...
When to use ' (or quote) in Lisp?
After making it through the major parts of an introductory Lisp book, I still couldn't understand what the special operator (quote) (or equivalent ' ) function does, yet this has been all over Lisp code that I've seen.
...