convention

问题 Based on the following examples, its possible to write a build-pattern with chained method calls in Rust which either passes by value or by reference (with a lifetime specifier) Is it possible to create a macro to implement builder pattern methods? How to overload the 'new' method? (top answer) https://github.com/rust-unofficial/patterns/blob/master/patterns/builder.md A builder pattern in Rust may look something like this: ui::Button::new() .label("Test") .align(Align::Center) .build(); When

问题 The normal way to initialise and allocate in Objective-C is NSObject *someObject = [[NSObject alloc] init]; Why is the following not practised? NSObject *someObject = [NSObject alloc]; [someObject init]; 回答1: The main problem is that you might end up using the wrong object. init is special in many classes as it might just release the receiver and instead create a new object that resides at a different address. So your someObject then points to the wrong (uninitialized) instance. There are a

问题 Could some one help, how would I instruct automap to have not-null for a column? public class Paper : Entity { public Paper() { } [DomainSignature] [NotNull, NotEmpty] public virtual string ReferenceNumber { get; set; } [NotNull] public virtual Int32 SessionWeek { get; set; } } But I am getting the following: <column name="SessionWeek"/> I know it can be done using fluent-map. but i would like to know it in auto-mapping way. 回答1: Thank you. Also, for reference properties ReferenceConvention

问题 Could some one help, how would I instruct automap to have not-null for a column? public class Paper : Entity { public Paper() { } [DomainSignature] [NotNull, NotEmpty] public virtual string ReferenceNumber { get; set; } [NotNull] public virtual Int32 SessionWeek { get; set; } } But I am getting the following: <column name="SessionWeek"/> I know it can be done using fluent-map. but i would like to know it in auto-mapping way. 回答1: Thank you. Also, for reference properties ReferenceConvention

问题 Most languages use the true/false keywords for boolean values. I found that even Smalltalk is using true/false . I know Objective-C is just borrowing concepts from Smalltalk, not the language itself, but I'm curious why it's using YES/NO instead of the more widely-used true/false . Is there any historical reason? 回答1: Objective-C was designed to be (and still is) a strict superset of C. The creators worked very hard to ensure that they did not break compatibility with C in any way. They also

问题 Sometimes a labeled break or continue can make code a lot more readable. OUTERLOOP: for ( ;/*stuff*/; ) { //...lots of code if ( isEnough() ) break OUTERLOOP; //...more code } I was wondering what the common convention for the labels was. All caps? first cap? 回答1: If you have to use them use capitals, this draws attention to them and singles them out from being mistakenly interpreted as "Class" names. Drawing attention to them has the additional benefit of catching someone's eye that will

问题 I just replaced the :id on the resource routes in rails 3 for a hash generated. I'm annoyed by the fact that I'm writing less conventional code (e.g. a link_to edit_user_path(@user) is now written as link_to '/users/#{@user.user_hash}'). So I'm wondering, is therea smarter way to do this? 回答1: class User < ActiveRecord::Base def to_param user_hash end end and edit_user_path(@user) will work properly for you 来源： https://stackoverflow.com/questions/5146286/replacing-id-from-routes-without

问题 I have a program that can read multiple audio formats. A shared module could provide a trait, AudioFileReader , that has common methods for reading audio data as well as a registry for associating readers to file extensions. Rather than have all the possible audio format readers built into the module, it would be useful for this module to be extensible, so that clients of the module can provide AudioFileReader s for new formats (either when linked into an executable or via a plug-in system).

问题 I know that CMake makes use of the standard name "CMakeLists.txt" and the add_subdirectory function for calling scripts directly in the build process. I have some CMake code that I use to turn files into C++ strings that can then be baked into the program using #include directives. The relevant code in my root CMakeLists file looks like this (greatly simplified, of course): add_custom_command( OUTPUT ${CMAKE_BINARY_DIR}/path/to/example.json.txt COMMAND ${CMAKE_COMMAND} ${CMAKE_SOURCE_DIR} $

问题 This seems like it should be easy to do, but I just can make it work. I'm hooked on the convention plugin in Struts 2.1. However, I need to define some package-level configuration such as a new interceptor stack and exception mappings. I'd like to use the struts.xml file for this, but I can't get the convention-based packages matched to the struts.xml packages. My struts.xml looks like: <struts> <constant name="struts.convention.default.parent.package" value="default"/> <package name="default