fn

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: A FnMut closure cannot be cloned, for obvious reasons, but a Fn closure has an immutable scope; is there some way to create a "duplicate" of a Fn closure? Trying to clone it results in: error [ E0599 ]: no method named `clone` found for type `std::boxed::Box<std::ops::Fn(i8, i8) -> i8 + std::marker::Send + 'static>` in the current scope --> src / main . rs : 22 : 25 | 22 | fp : self . fp . clone (), | ^^^^^ | = note : self . fp is a function , perhaps you wish to call it = note : the method `clone` exists but the following trait

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: What is the difference between those two, and when will I use one over the other? 回答1: setTimeout is simply like calling the function after delay has finished. Whenever a function is called it is not executed immediately, but queued so that it is executed after all the executing and currently queued eventhandlers finish first. setTimeout(,0) essentially means execute after all current functions in the present queue get executed. No guarantees can be made about how long it could take. setImmediate is similar in this regard except that it

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Running this code from Herb Sutter's presentation . This works fine in linux under gcc 4.6.3. I'm thinking that future.h isn't supported in mingw, but the error is really hard to understand! #include <iostream> #include <vector> #include <string> #include <future> #include <algorithm> using namespace std; string flip( string s ) { reverse( begin(s), end(s) ); return s; } int main() { vector<future<string>> v; v.push_back( async([]{ return flip(" ,olleH"); }) ); v.push_back( async([]{ return flip(".gnaL"); }) ); v.push_back( async([]{ return

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to call a registered JS function when a c++ callback is called, but I'm getting a segfault for what I assume is a scoping issue. Handle addEventListener( const Arguments& args ) { HandleScope scope; if (!args[0]->IsFunction()) { return ThrowException(Exception::TypeError(String::New("Wrong arguments"))); } Persistent fn = Persistent ::New(Handle ::Cast(args[0])); Local num = Number::New(registerListener(&callback, &fn)); scope.Close(num); } When an event happens, the following method is called. I'm assuming that this probably

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I wrote a confusion matrix calculation code in Python: def conf_mat(prob_arr, input_arr): # confusion matrix conf_arr = [[0, 0], [0, 0]] for i in range(len(prob_arr)): if int(input_arr[i]) == 1: if float(prob_arr[i]) = 0.5: conf_arr[1][0] = conf_arr[1][0] +1 else: conf_arr[1][1] = conf_arr[1][1] +1 accuracy = float(conf_arr[0][0] + conf_arr[1][1])/(len(input_arr)) prob_arr is an array that my classification code returned and a sample array is like this: [1.0, 1.0, 1.0, 0.41592955657342651, 1.0, 0.0053405015805891975, 4.5321494433440449e-299,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am currently working with Boost.Python and would like some help to solve a tricky problem. Context When a C++ method/function is exposed to Python, it needs to release the GIL (Global Interpreter Lock) to let other threads use the interpreter. This way, when the python code calls a C++ function, the interpreter can be used by other threads. For now, each C++ function looks like this: // module.cpp int myfunction(std::string question) { ReleaseGIL unlockGIL; return 42; } To pass it to boost python, I do: // python_exposure.cpp BOOST_PYTHON

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am trying to submit a simple word count topology to my local storm cluster. First, i tried using maven and then using storm command line client. I created the JAR file using eclipse. But, it throws main class not found exception. Can anyone tell me what could be the problem? I am attaching the code and exception below. package com . test . newpackage ; import com . test . newpackage . WordReader ; import backtype . storm . Config ; import backtype . storm . LocalCluster ; import backtype . storm . topology . TopologyBuilder ;

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm still fairly new to rust. I would like to use a variable to choose between one of several functions which return structs of different types, but all of which have the same trait implemented. I would then like to pass the returned struct from the selected function to some functions which are meant to accept any variable which has that trait. However, I can't figure out how to do it. I've read How do I overcome match arms with incompatible types for structs implementing same trait? but I'm missing something because I still can't

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: UPDATE: I solved this problem with the help of Mark Tolonen's answer below. Here is the solution (but I'm puzzled by one thing): I begin with the encoding string shown in Mark Tolonen's answer below (UTF-8): CA_f1 = ( ctypes . c_char_p * len ( f1 ))(*( name . encode () for name in f1 )) With optimizations off, I always store rcx into a memory variable on entry. Later in the program when I need to use the pointer in rcx, I read it from memory. That works for a single pointer, but doesn't work for accessing the pointer array Mark

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: To implement an iterator in Rust, we only need to implement the next method, as explained in the documentation . However, the Iterator trait has many more methods . As far as I know, we need to implement all the methods of a trait. For instance, this does not compile ( playground link ): struct SomeStruct {} trait SomeTrait { fn foo (& self ); fn bar (& self ); } impl SomeTrait for SomeStruct { fn foo (& self ) { unimplemented !() } } fn main () {} The error is pretty clear: error [ E0046 ]: not all trait items implemented ,