implementation

Handler-Looper implementation in Android

由 瘦欲@ 提交于 2019-12-01 06:06:44
问题 I have Activity with Handler (UI thread) I start new Thread and make handler.post(new MyRunnable()) - (new work thread) Android documentation said about post method: "Causes the Runnable r to be added to the message queue. The runnable will be run on the thread to which this handler is attached." Handler attached to UI thread. How android can run runnable in the same UI thread without new thread creation? Is new thread will be created using Runnable from handler.post()? Or it's only run()

Where can I find the implementation for std::string

由 一个人想着一个人 提交于 2019-12-01 03:47:46
I am looking for the code for the c++ string class. What header is it implemented in? There is no single implementation for std::string . But you can find your particular implementation in the <string> header. On my system it can be found here: /usr/lib/gcc/x86_64-pc-linux-gnu/4.5.0/include/g++-v4/bits/basic_string.h and /usr/lib/gcc/x86_64-pc-linux-gnu/4.5.0/include/g++-v4/bits/basic_string.tcc On a Debian-based system: ~$ locate basic_string.tcc /usr/include/c++/4.5/bits/basic_string.tcc /usr/include/c++/4.6/bits/basic_string.tcc ~$ locate basic_string.h /usr/include/c++/4.5/bits/basic

How to control the chunk size of `std::deque` when allocating a new chunk?

由 有些话、适合烂在心里 提交于 2019-12-01 01:55:02
问题 When we insert a new element into a std::deque , it may allocate a new chunk to contain the element if the existing chunks are all full. However, how does the implementation control the chunk size? Is it possible for the user to control the chunk size? or it just depends on the implementation's choice, e.g. 4K or 8K? 回答1: This is a chosen value of the implementation, and there is no control over it. For example Microsoft choose values of 16 or smaller for the number of elements in a block.

Simplest way to match 2d array of keys/strings to search in perl?

由 最后都变了- 提交于 2019-12-01 01:38:49
Related to my previous question ( found here ), I want to be able to implement the answers given with a 2 dimensional array, instead of one dimensional. Reference Array row[1][0]: 13, row[1][1]: Sony row[0][0]: 19, row[0][1]: Canon row[2][0]: 25, row[2][1]: HP Search String: Sony's Cyber-shot DSC-S600 End Result: 13 use strict; use warnings; my @array = ( [ 19, 'Canon' ], [ 13, 'Sony' ], [ 25, 'HP' ], ); my $searchString = "Sony's Cyber-shot DSC-S600"; my @result = map { $array[$_][0] } # Get the 0th column... grep { $searchString =~ /$array[$_][1]/ } # ... of rows where the 0 .. $#array; #

Where can I find the implementation for std::string

由 ＊爱你＆永不变心＊ 提交于 2019-12-01 00:32:15
问题 I am looking for the code for the c++ string class. What header is it implemented in? 回答1: There is no single implementation for std::string . But you can find your particular implementation in the <string> header. On my system it can be found here: /usr/lib/gcc/x86_64-pc-linux-gnu/4.5.0/include/g++-v4/bits/basic_string.h and /usr/lib/gcc/x86_64-pc-linux-gnu/4.5.0/include/g++-v4/bits/basic_string.tcc On a Debian-based system: ~$ locate basic_string.tcc /usr/include/c++/4.5/bits/basic_string

Constructing a Binary tree in Java [closed]

由 时光怂恿深爱的人放手 提交于 2019-11-30 14:52:37
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I am constructing a binary tree. Let me know if this is a right way to do it. If not please tell me how to?? I could not find a proper link where constructing a general binary tree has been coded. Everywhere BST is coded. 3 / \ 1 4 / \ 2 5 This is the binary tree which i want to make.I should be able to do all

Making class conform to protocol with category for existing methods

由 百般思念 提交于 2019-11-30 14:45:01
问题 I have a protocol named MyProtocol. MyProtocol has an required method: - (NSUInteger)length; And some other methods. Now i want to make the NSString class conform to MyProtocol with a category. Like so: @interface NSString (NSStringWithMyProtocol) <MyProtocol> @end In this category i implement all methods excluding the 'length' method, because i want the original NSString implementation. I do not want to override it in this particular class. Now i get a warning because of an incomplete

Fastest implementation for All-pairs shortest paths problem?

由 孤街醉人 提交于 2019-11-30 13:50:10
I have a weighted graph 30k nodes 160k edges, no negative weights. I would like to compute all the shortest paths from all the nodes to the others. I think I cannot assume any particular heuristics to simplify the problem. I tried to use this Dijkstra C implementation http://compprog.wordpress.com/2007/12/01/one-source-shortest-path-dijkstras-algorithm/ , that is for a single shortest path problem, calling the function dijkstras() for all my 30 nodes. As you can imagine, it takes ages. At the moment I don't have the time to write and debug the code by myself, I have to compute this paths as

Implementation of Friend concept in Java [duplicate]

由 吃可爱长大的小学妹 提交于 2019-11-30 12:18:26
问题 This question already has answers here : Is there a way to simulate the C++ 'friend' concept in Java? (19 answers) Closed 5 years ago . How does one implement the friend concept in Java (like C++)? 回答1: Java does not have the friend keyword from C++. There is, however, a way to emulate that; a way that actually gives a lot more precise control. Suppose that you have classes A and B. B needs access to some private method or field in A. public class A { private int privateInt = 31415; public

Making class conform to protocol with category for existing methods

由 淺唱寂寞╮ 提交于 2019-11-30 11:51:30
I have a protocol named MyProtocol. MyProtocol has an required method: - (NSUInteger)length; And some other methods. Now i want to make the NSString class conform to MyProtocol with a category. Like so: @interface NSString (NSStringWithMyProtocol) <MyProtocol> @end In this category i implement all methods excluding the 'length' method, because i want the original NSString implementation. I do not want to override it in this particular class. Now i get a warning because of an incomplete implementation of MyProtocol in the category. I know there are a few solutions to solve this. Make the method
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