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Rails detect if request was AJAX
... you're using :remote => true in your links or forms, you'd do:
respond_to do |format|
format.js { #Do some stuff }
You can also check before the respond_to block by calling request.xhr?.
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Make a negative number positive
...
Note the edge cases, e.g. Math.abs(Integer.MIN_VALUE) = Integer.MIN_VALUE.
– Zach Scrivena
Jan 30 '09 at 0:24
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Equivalent C++ to Python generator pattern
...to signal termination
In your trivial example, it's easy enough. Conceptually:
struct State { unsigned i, j; };
State make();
void next(State&);
bool isDone(State const&);
Of course, we wrap this as a proper class:
class PairSequence:
// (implicit aliases)
public std::iterat...
How to pass a function as a parameter in Java? [duplicate]
...u have a class or interface with only a single abstract method (sometimes called a SAM type), for example:
public interface MyInterface {
String doSomething(int param1, String param2);
}
then anywhere where MyInterface is used, you can substitute a lambda expression:
class MyClass {
publ...
C/C++ NaN constant (literal)?
... Indeed, it's an option if you need obfuscation but not portability. Personally, I prefer portability without obfuscation, so I won't suggest it myself.
– Mike Seymour
May 22 '13 at 12:26
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mfc 按钮变成了非xp风格、界面变成windows经典样式的原因总结 - C/C++ - 清...
...xp风格 xp风格stdafx.h中添加：#ifdef _UNICODE#if defined _M_IX86#pragma co...首先看一下xp风格与非xp风格：
非xp风格 xp风格
stdafx.h中添加：
#ifdef _UNICODE
#if defined _M_IX86
#pragma comment(lin...
What's the difference between parenthesis $() and curly bracket ${} syntax in Makefile?
... like unomadh GNU make example.
From the GNU make manual on the Function Call Syntax (emphasis mine):
[…] If the arguments themselves contain other function calls or variable references, it is wisest to use the same kind of delimiters for all the references; write $(subst a,b,$(x)), not $(sub...
NSIS学习笔记（持续更新） - C/C++ - 清泛网 - 专注C/C++及内核技术
...code\Plugins"
echo off
Q 桌面快捷方式，示例
在section "install"中添加下面的代码，新建shortcut
CreateShortcut "$DESKTOP\${APPNAME}.lnk" "$INSTDIR\${APPEXENAME}"
在section "uninstall"中添加下面的代码，删除shortcut
delete "$DESKTOP\${APPNAME}.lnk"
Q 关...
Is there a WebSocket client implemented for Python? [closed]
...ient
Sample client code:
#!/usr/bin/python
from websocket import create_connection
ws = create_connection("ws://localhost:8080/websocket")
print "Sending 'Hello, World'..."
ws.send("Hello, World")
print "Sent"
print "Receiving..."
result = ws.recv()
print "Received '%s'" % result
ws.close()
S...
Replace comma with newline in sed on MacOS?
...line, e.g.
echo "a,b" | sed -e $'s/,/\\\n/g'
Note this will not work on all shells, but will work on the most common ones.
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