containers

Abstract factory pattern on top of IoC?

由 橙三吉。 提交于 2019-11-27 05:58:23
I have decided to use IoC principles on a bigger project. However, i would like to get something straight that's been bothering me for a long time. The conclusion that i have come up with is that an IoC container is an architectural pattern, not a design pattern. In other words, no class should be aware of its presence and the container itself should be used at the application layer to stitch up all components. Essentially, it becomes an option, on top of a well designed object-oriented model. Having said that, how is it possible to access resolved types without sprinkling IoC containers all

STL map onto itself?

由 拈花ヽ惹草 提交于 2019-11-27 05:47:50
问题 I'd like to create a std::map that contains a std::vector of iterators into itself, to implement a simple adjacency list-based graph structure. However, the type declaration has me stumped: it would seem you need the entire map type definition to get the iterator type of said map, like so: map< int, Something >::iterator MyMap_it; // what should Something be? map< int, vector<MyMap_it> > MyMap_t; Is there some sort of partial map iterator type I can get with just the key type, so I can

Is the behaviour of Python's list += iterable documented anywhere?

由 孤人 提交于 2019-11-27 04:46:01
It would appear that in Python, list += x works for any iterable x : In [6]: l = [] In [7]: l += [1] In [8]: l += (2, 3) In [9]: l += xrange(5) In [10]: l Out[10]: [1, 2, 3, 0, 1, 2, 3, 4] Is this behaviour documented anywhere? To contrast this with list + x , the latter only works if x is also a list . This is spelled out in the documentation . Ashwini Chaudhary From Guido van Rossum : It works the same way as .extend() except that it also returns self . I can't find docs explaining this. :-( Here is the relevant source code taken from listobject.c : list_inplace_concat(PyListObject *self,

How to I create a boost interprocess vector of interprocess containers?

由 余生长醉 提交于 2019-11-27 03:40:06
问题 I like to create a boost interprocess vector of classes containing a interprocess container. The following code works until the resize function call and of course because my class has not default constructor. How to I resolve this problem? The example is based on the boost Containers of containers example Thanks Markus #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <boost/interprocess/containers/map.hpp> #include <boost

Why is there a separation of algorithms, iterators and containers in C++ STL

由 我怕爱的太早我们不能终老 提交于 2019-11-27 03:28:24
问题 I can't figure out why they have separated algorithms, iterators and containers in C++ STL. If it's a heavy use of templates everywhere, then we can have classes having all stuff in one place with template parameters. Some text that I got explains that iterators helps algorithms to interact with containers data but what if containers expose some mechanism to access the data it possesses? 回答1: With M containers + N algorithms, one would normally need M * N pieces of code, but with iterators

Assign LAN IP address to Docker container different from host's IP address

由 梦想的初衷 提交于 2019-11-27 02:51:01
问题 Am not well versed with Unix networking, adding virtual interfaces etc, trying to learn it now. We are trying to dockerize our application. My requirement is : To assign an ip to a docker container which is accessible from an external application/browser. The container ip should be pingable from a different computer in the same network basically.I don't want to use port forwarding. I want to access a docker container just like we access a VM using an ip address.[ Without the port mapping, -p

C++ STL: Which method of iteration over a STL container is better?

由 旧街凉风 提交于 2019-11-27 02:14:58
问题 This may seem frivolous to some of you, but which of the following 2 methods of iteration over a STL container is better? Why ? class Elem; typedef vector<Elem> ElemVec; ElemVec elemVec; // Method 0 for (ElemVec::iterator i = elemVec.begin(); i != elemVec.end(); ++i) { Elem& e = *i; // Do something } // Method 1 for (int i = 0; i < elemVec.size(); ++i) { Elem& e = elemVec.at(i); // Do something } Method 0 seems like cleaner STL, but Method 1 achieves the same with lesser code. Simple

Docker on CentOS with bridge to LAN network

由 ⅰ亾dé卋堺 提交于 2019-11-27 02:01:35
问题 I have a server VLAN of 10.101.10.0/24 and my Docker host is 10.101.10.31. How do I configure a bridge network on my Docker host (VM) so that all the containers can connect directly to my LAN network without having to redirect ports around on the default 172.17.0.0/16? I tried searching but all the howtos I've found so far have resulted in losing SSH session which I had to go into the VM from a console to revert the steps I did. 回答1: There's multiple ways this can be done. The two I've had

Best string container: StringCollection, Collection<string>, List<string>, ArrayList, ..?

由 那年仲夏 提交于 2019-11-27 01:15:49
问题 What is the most suitable container just for strings holding in some array with non-predetermined upper boundary, which length is unknown on it's creation. For simple code like: var list = new SomeContainer(); // size is unknown for()/foreach()/do()/while() // any loop { list.Add(string); } Is it StringCollection as optimized Collection for string, or just Collection<string> or List<string> or ArrayList ? What is the different between them? 回答1: For what you need, List<string> is probably the

Looking for Prism example of Modules loading themselves into a menu

由 不羁的心 提交于 2019-11-27 01:10:32
问题 Does anyone know of WPF code examples using Prism in which modules each register themselves as a menuitem in a menu within another module? (I've currently got an application which tries to do this with the EventAggregator, so one module listens for published events from other modules which need to have their title in the menu as a menu item, but I'm getting problems with the order of loading and threading etc. I want to find an example that uses classic Prism structure to do this.) I'm
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