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Shall we always use [unowned self] inside closure in Swift
... self] in
self.changeDisplayViewMode() // won't happen after vc closes.
}
// use weak here
networkManager.fetch(query: query) { [weak self] (results, error) in
self?.updateUI() // could be called any time after vc closes
}
}
...
What are JavaScript's builtin strings?
...(1<<1)]; // "%"
u=(function(){club=1}+[])[1+11+(1<<1)]; // "u"
vc=p+u+(0+[])+(0+[])+((111>>1)+11+10+[]); // "%u0076"
unescape(vc);
Or, for this specific problem, maybe just:
(function(){v=1}+[])[10+(1<<1)]; // "v"
...
Which, if any, C++ compilers do tail-recursion optimization?
...isation is straightforward: Just switch on optimisation for speed:
For MSVC, use /O2 or /Ox.
For GCC, Clang and ICC, use -O3
An easy way to check if the compiler did the optimisation is to perform a call that would otherwise result in a stack overflow — or looking at the assembly output.
As a...
Guaranteed lifetime of temporary in C++?
...oves into, not the expression. There is a really good blog post from the MSVC team on that walks through this in great detail and I encourage folks to read it.
The pedagogical example for moving rvalue's is temporary strings and I'll show assignment in a constructor. If I have a class MyType that ...
error: passing xxx as 'this' argument of xxx discards qualifiers
...ied
whether or not iterator and
const_iterator are the same type.
So VC++ 2008 Dinkumware implementation is faulty.
Old answer:
You got that error because in certain implementations of the std lib the set::iterator is the same as set::const_iterator.
For example libstdc++ (shipped with ...
记一次诡异的Linux程序启动即崩溃：Program received signal SIGSEGV, Segm...
...的原因是没定位出来，但是可以确定的是程序编译依赖的问题，重新整理并添加了一下程序的依赖库，重新编译后就ok了。
（程序启动即崩溃出问题的时候没有添加部分依赖库，竟然可以正常编译通过，整个过程感觉有些诡异...
UltraISO写入U盘出现\"设备写入错误121,建议格式化\"，但格式化多次后仍无...
...吧，不信你拷文件进去仍然会提示失败，不是UltraISO软件问题，硬件问题啦~~~不用想啦，U盘坏了，换个新的吧，不信你拷文件进去仍然会提示失败，不是UltraISO软件问题，硬件问题啦~~~
蓝牙BLE设备使用BLE拓展连不上蓝牙？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
转会员问题：我现在手上有一款蓝牙设备是BLE的， 我在编程都时候用了ble的拓展组件 但是在连接那一步连不上这个蓝牙？
这里统一说明一下：
一般先用硬件厂商提供的App 或者 nRF Connect App 进行硬件连接和测试，没...
最大装载数不显示计算数值 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...数输出+（高数输出×横数输出）÷2＝最大装载数
出现问题不显示计算数字代码块没有问题，经过测试是能够正确计算出除法结果的，测试时主要被除数要大于除数，否则计算结果0.xxx 向下取整就是0，干扰测试结果。。。之后...
蓝牙接收的数据怎么一行一行更新显示和，类似图2这样的 - App应用开发 - 清...
...一个 无法将接收的数据全部罗列出来，而且显示的还有问题，有时候显示一个，有时候显示3个数据。求解！！使用列表显示框组件，详见文档：https://www.fun123.cn/reference/ ... rface.html#ListView还是不行呐 列表显示框放在垂直滚动布...