wrapper

Why Java does not allow null while declaring primitive data types [duplicate]

核能气质少年 提交于 2019-11-29 16:36:08
问题 This question already has answers here : Why can't primitive data types be “null” in Java? (8 answers) Closed 6 years ago . This is in continuation to my previous question and accroding to answers of this question Declaration of wrapper classes Java wraps primitive data type to wrapper classes then why char c = null; // invalid int i = null; // invalid is not allowed but Character cObj = null; // valid Integer iObj = null; // valid is allowed. 回答1: Because primitives represent value and

unsigned char ** equivalent in c# and have to write the return value in a file

做~自己de王妃 提交于 2019-11-29 16:11:11
I have to call a win32 dll function int func1( int arg1, unsigned char **arg2, int *arg3); and i need wrapped in c# as public extern int fuc1(int arg1, out IntPtr arg2, out IntPtr arg3); and i called it from a c# application as int arg1; IntPtr arg2 = IntPtr.Zero; IntPtr arg3 = IntPtr.Zero; func1(arg1,out arg2,out arg3); Is the function declared in the c# wrapper as well as called in C# test app Correct ? Now i need to store the arg2 in a text file. How to do that. Got answer from Hans and i wrote it in a file using System.IO.StreamWriter(@Application.StartupPath + "\\Filename.txt"); file

How to know when the request is forwarded in a RequestWrapper object

不羁岁月 提交于 2019-11-29 15:40:29
I am using a subclass of HttpServletRequestWrapper to do some translations on the request parameters, and I cache the translated values the first time they are requested. For example, the first time getQueryString() is called, I call super.getQueryString() and calculate the result that I want and keep it in a field, and then return it. Next times, I just use the cached result. This method works like a charm unless there's some "forwarding". When a request is forwarded, Tomcat replaces the original request, so my cached query string is not changed, and the forwarded page gets the original query

__next__ in generators and iterators and what is a method-wrapper?

﹥>﹥吖頭↗ 提交于 2019-11-29 14:53:49
问题 I was reading about generator and iterators and the role of __next__() . '__next__' in dir(mygen) . is true '__next__' in dir(mylist) , is false As I looked deeper into it, '__next__' in dir (mylist.__iter__()) is true why is __next__ only available to list but only to __iter__() and mygen but not mylist . How does __iter__() call __next__ when we are stepping thru the list using list-comprehension Trying to manually step (+1) up the generator, I called mygen.__next__() . It doesn't exist. It

Wrapping C++ code with python (manually)

一世执手 提交于 2019-11-29 14:10:31
问题 I have a main file(main.cpp) and a header file(nodes.hpp). The main file takes N(any positive integer) as input argument and by using the functions of header file it gives output say 'x & y' (both double). Note: Both main and header files are written in C++. Both main and header files instead of using data structues as arrays,vectors, make use of Eigen Library. I have to write a python wrapper for them, I have working knowledge of python but have never used any wrapper. Can anybody please

How can I decorate all functions imported from a file?

泪湿孤枕 提交于 2019-11-29 11:31:01
I have created many functions that are divided into different files, now I would like to apply the same decorator for all of them without modifying the files and without applying the decorators one by one. I have tried to use this explanation written by delnan, but I got no success for imported functions. About the decorator, it must update a list every time a function within a class is executexecuted with the function arguments and values, just like this other question I asked. Any suggestions to help me with this issue? Thanks A little bit of introspection ( dir() ) and dynamic look-up with

How to wrap existing function in C

泄露秘密 提交于 2019-11-29 10:54:41
I am trying to wrap existing function. below code is perfectly worked. #include<stdio.h> int __real_main(); int __wrap_main() { printf("Wrapped main\n"); return __real_main(); } int main() { printf("main\n"); return 0; } command: gcc main.c -Wl,-wrap,main output: Wrapped main main So i have changed main function with temp. my goal is to wrap temp() function. Below is the code temp.c #include<stdio.h> int temp(); int __real_temp(); int __wrap_temp() { printf("Wrapped temp\n"); return __real_temp(); } int temp() { printf("temp\n"); return 0; } int main() { temp(); return 0; } command: gcc temp.c

Extend python with C, return numpy array gives garbage

孤街醉人 提交于 2019-11-29 10:06:20
问题 I am wrapping a C file so I can use it in python. The output of the C function is an array of doubles. I want this to be a numpy array in python. I get garbage. Here's an example that generates the error. First, the C file (focus on the last function definition, everything else should be OK): #include <Python.h> #include <numpy/arrayobject.h> #include <stdio.h> static char module_docstring[] = "docstring"; static char error_docstring[] = "generate the error"; static PyObject *_aux_error

Change Shortcode wrapper in Woocommerce

南笙酒味 提交于 2019-11-29 08:14:37
I'm using Wordpress 3.8 + Woocommerce 2.0 I need to change the class of the wrapper that Woocommerce generate when I use a shortcode. I use this shortcode: [recent_products per_page="12"] And the output is: <div class="woocommerce"> the_product_loop.... </div> I want to obtain <div class="MYCUSTOMCLASS"> the_product_loop.... </div> But I can't find where I have to change the code... In class-wc-shortcodes.php file I've found the declaration of the function that generates the wrapper: public static function shortcode_wrapper( $function, $atts = array(), $wrapper = array( 'class' => 'woocommerce

Writing a C++ Wrapper around Objective-C

时间秒杀一切 提交于 2019-11-29 07:56:56
问题 I want to call and work with Objective-C classes from within a C++ project on OS X. It is time to start moving towards all Objective-C, but we need to do this over some time. How does one go about accomplishing this? Can anyone shed some light and provide an example? 回答1: Objective-C++ is a superset of C++, just as Objective-C is a superset of C. It is supported by both the gcc and clang compilers on OS X and allows you to instantiate and call Objective-C objects & methods from within C++. As