containers

问题 Short introduction to my questions: i'm trying to implement a "sort of" relational database using stl containers. This is just for fun/educational purpose, so no need for answers like "use this library", "this is absolutely useless" and so on. I know title is a little bit confusing at this point, but we will reach the point (suggestions for improvement to title are really welcome). I proceeded with little steps: i can build table as vector of maps from columns name to their values => std:

问题 I stumbled upon the following problem: I have two packages A and B working fine for each own. Each has its own interface and his own implementation. Now i made a package C combining a adapter of A with a concrete Implemenation of B. C actually only implements the Interface of A and is only inheritating and using the Interface of B internally for now. Most of the times that was enough to have only access to the Interface A from a Container, but now i need the methods from B accessible too.

问题 I stumbled upon the following problem: I have two packages A and B working fine for each own. Each has its own interface and his own implementation. Now i made a package C combining a adapter of A with a concrete Implemenation of B. C actually only implements the Interface of A and is only inheritating and using the Interface of B internally for now. Most of the times that was enough to have only access to the Interface A from a Container, but now i need the methods from B accessible too.

问题 I use IndexedContainer in my grid. Grid grid = new Grid(); IndexedContainer container = new IndexedContainer(); grid.setContainerDataSource(container); container.addContainerProperty("Something", String.class, ""); I need to change the name of the container property. E.g property "Something" to "New property" after the click on the button. Any ideas ? Thank you very much ! 回答1: NOTE 1: Where did you get vaadin 7.8.4 from? The latest 7.x release I can see is 7.7.10. For this exercise I'll

问题 I have looked up a million techniques and I can't get this to work and I know there is other posts similar to this. I'm sorry if it bugs anyone but I need specific instructions for my code cuz me stupid. Thank you so much in advance! I want the div container contentContactBox, along with all of the divs inside it, to proportionally resize when the browser window is resized. On the left side of the contentcontactBox is some text and on the right is a google map imbed. I want them all to shrink

问题 Does any library has a Circular buffer class that can be used with pre-allocated buffer? I looked at Boost::circular_buffer, but it seems all of its constructors require an allocator. I don't want to reinvent circular buffer class, but have to use pre-allocated buffer. I want something like: char buffer[1000]; // pre-allocated buffer. circular_buffer_class cb; // a class that provides the interface as a circular buffer. cb.attach(buffer, 1000); // attaching the preallocated buffer to the

问题 I have been looking everywhere on how I can implement Spring Security based on a Container Managed Security Model. In my test case, I am using Tomcat and it's corresponding tomcat-users.xml file. The issue is, I cannot get Spring Security to play well (meaning pass authentication over to Tomcat) to let the app server perform the Authentication and have Spring manage the role based security once someone is authenticated. I am using the latest Spring versions, so it's all Java config as I am

问题 I am trying to figure out a way to have a container of functors so that I can pass a value into the functors and have it be modified however I am having trouble allowing the functors to not be restricted in what types they can be passed and the amount of arguments they can take. My actual use for this is that I have a series of functors which all change a 3D vector in some way based on the input. By being able to store these functors in a container I can manipulate the order in which they are

问题 According the the C++ reference STL containers were fixed in C++11 standard to take constant iterator in the erase methods. The following code would not compile in g++4.7 with c++0x enabled. #include <vector> int main() { std::vector<int> vector; vector.push_back(0); std::vector<int>::const_iterator vectorItr = vector.begin(); vector.erase(vectorItr); } Obviously the new signatures were not implemented. Is there any information when this issue will be fixed? I could not find any respective

问题 Given any character, what's the fastest way for me to determine if that character belongs to a set (not the container-type) of known characters. In other words, what's the fastest elegant way to implement the conditional: char c = 'a'; if(c == ch1 || c == ch2 || c == ch3 ...) // Do something... Is there an STL container (I'm thinking it might be unordered_set?) that I can just pass the character as a key to and it'll return true if the key exists? Anything with an O(1) lookup time will work