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not None test in Python [duplicate]
...r of the latter two, since val could potentially be of a type that defines __eq__() to return true when passed None.
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What tools are there for functional programming in C?
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FFCALL lets you build closures in C -- callback = alloc_callback(&function, data) returns a function pointer such that callback(arg1, ...) is equivalent to calling function(data, arg1, ...). You will have to handle garbage collection manually, though.
Relatedly, blocks have...
Get name of caller function in PHP?
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See debug_backtrace - this can trace your call stack all the way to the top.
Here's how you'd get your caller:
$trace = debug_backtrace();
$caller = $trace[1];
echo "Called by {$caller['function']}";
if (isset($caller['class']))
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What is Bit Masking?
...esult: 00000101b
Masking is implemented using AND, so in C we get:
uint8_t stuff(...) {
uint8_t mask = 0x0f; // 00001111b
uint8_t value = 0x55; // 01010101b
return mask & value;
}
Here is a fairly common use-case: Extracting individual bytes from a larger word. We define the high-...
What is the list of possible values for navigator.platform as of today? [closed]
...mv5tejl
Linux armv6l
Linux armv7l
Linux armv8l
Linux i686
Linux i686 on x86_64
Linux i686 X11: based on X11 Window System
Linux MSM8960_v3.2.1.1_N_R069_Rev:18: Sony Xperia V
Linux ppc64
Linux x86_64
Linux x86_64 X11: based on X11 Window System
Microsoft
Even on a 64-bit Windows 8 they all stick to ...
Check whether a request is GET or POST [duplicate]
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Better use $_SERVER['REQUEST_METHOD']:
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
// …
}
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jQuery or CSS selector to select all IDs that start with some string [duplicate]
How can I select all elements whose id starts with "player_"?
4 Answers
4
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How to filter array in subdocument with MongoDB [duplicate]
...use $group to put it back together:
db.test.aggregate([
{ $match: {_id: ObjectId("512e28984815cbfcb21646a7")}},
{ $unwind: '$list'},
{ $match: {'list.a': {$gt: 3}}},
{ $group: {_id: '$_id', list: {$push: '$list.a'}}}
])
outputs:
{
"result": [
{
"_id": ObjectId("512...
VS Addin插件基本开发入门 - C/C++ - 清泛网 - 专注C/C++及内核技术
...lic partial class MyUserControl : UserControl
{
private DTE2 _applicationObject;
/// <summary>
/// VS的DTE2对象
///
public DTE2 ApplicationObject { set { _applicationObject = value; } }
public MyUserControl()
{
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未能从“const std::string”为“const std::_Tree &”推导 模板 参数 - C/...
未能从“const std::string”为“const std::_Tree &”推导 模板 参数参考：http: www tsingfun com html 2016 dev_0630 1876 html参考：https://www.tsingfun.com/it/cpp/1876.htmlstl 模板 参数