qualifiers

问题 I am reading some text at this url: https://cs.senecac.on.ca/~btp100/pages/content/varia_p.html In the section 'Qualifiers', they say: "We can qualify the int type to be sure that it contains a minimum number of bits" .... A short contains at least 16 bits: .... I don't understand this, what does "qualify the int type" mean and why "A short contains at least 16 bits". Can anybody elaborate on this please? Thanks all. 回答1: You can use Qualifiers to indicate what size of number you want to

问题 Is it valid to use drawable-swdp- like drawable-sw720dp-xhdpi? Below is my scenario: My Acer iconia tab A501 (10") has a resolution of 1280x800 and density mdpi(160dp). It is expected to take the resource from drawable-sw720dp-mdpi. But the resource is being taken from drawable-sw720dp-xhdpi. I have following folders: drawable-sw720dp drawable-sw720dp-mdpi drawable-sw720dp-hdpi drawable-sw720dp-xhdpi is this the way this qualifier is to be used? or Is the density already considered while

问题 In this example, does correctness require global_value to be declared volatile ? int global_value = 0; void foo () { ++ global_value; } void bar () { some_function (++global_value); foo (); some_function (++global_value); } My understanding is that volatile is "intended" for pointers to mapped memory and variables which can be modified by signals (and emphatically not for thread-safety) but it's easy to imagine that bar might compile to something like this: push EAX mov EAX, global_value inc

问题 Came across a proposal called "rvalue reference for *this" in clang's C++11 status page. I've read quite a bit about rvalue references and understood them, but I don't think I know about this. I also couldn't find much resources on the web using the terms. There's a link to the proposal paper on the page: N2439 (Extending move semantics to *this), but I'm also not getting much examples from there. What is this feature about? 回答1: First, "ref-qualifiers for *this" is a just a "marketing

问题 imagine having a producer for a SessionFactory (as example): @Produces public SessionFactory produceSessionFactory(){} No I have a second producer that produces some other object, lets say a DatabaseObject, and needs a reference to a SessionFactory: @Produces public DatabaseObject produceDatabaseObject(SessionFactory factory){} No I can use my database object like that: @Inject DatabaseObject object; So far, so good. So lets assume this stuff is implemented in a framework and is going to be

问题 The Problem: Hello i'm having a problem on java EE , i have to use annotation like @Inject @Stateless etcetc, but i can't get a solution, after reading a lot of documentation and example etcetc it seems that what i 've code should work but definitly not. So the problem is that i have a custom qualifiers on an interface like this @Qualifier @Retention(RUNTIME) @Target({METHOD, FIELD, PARAMETER, TYPE}) public @interface BudgetsDs { } and i want inject it in another object as a member field like

问题 This is relevant to one asked in Pass Parameter to Instance of @Inject Bean but i need some different approach for my implemenation. For passing parameter while injecting, a custom qualifier can be created like : @Qualifier @Target({ TYPE, METHOD, PARAMETER, FIELD }) @Retention(RUNTIME) @Documented public @interface SendInject{ @Nonbinding int value() default 0; // int value will be store here } The class to be injected need to be annotated with @SendInject as: @SendInject public class

问题 I have quite a large conflict dataset (71 million observations) with many variables and date (daily). This is from the GDELT project for which the way the dataset is structured is that for each day, there is a target country and a source country of aggression. Namely, the first of January of 2000, many countries engaged in aggressive behaviour against others or themselves, and this dataset tracks this. It looks like this: clear input long date_01 str18 source_01 str19 target_01 str4 cameocode

问题 You all have been so helpful, and I was wondering whether I might trouble you a bit more. I have nearly completed my conversion from VB.net to VBA for Outlook, and in order to complete that, I need some information on what exactly a particular piece of code is returning. If you all can help out with that, the problem may go away; if not, I might need some help on this invalid qualifier error. From what I understand, I declare an 'array' in VBA with a command like this: Dim Computers(1, 1) As

问题 Spring has its own Qualifier annotation, I think it's equivalent to the javax.inject.Named annotation, which in turn is a concrete qualifier in JSR-330. So, I'm wondering which version of Spring, if any, supports Qualifier? Here is my example usage, unfortunately it doesn't work with spring-context 3.0.5: @Retention(RUNTIME) @javax.inject.Qualifier public @interface Version { String value(); } @Configuration public class MyConfig { @Bean("book-12") @Version("a") Book book12a() { ... } @Bean(