visibility

问题 I've never seen a single trait where properties and methods are private or protected. Every time I worked with traits I observed that all the properties and methods declared into any trait are always public only. Can traits have properties and methods with private and protected visibility too? If yes, how to access them inside a class/inside some other trait? If no, why? Can traits have constructor and destructor defined/declared within them? If yes, how to access them inside a class? If no,

问题 I have a WPF application. In one window there is a combobox..and I want to hide the toggle button and disable the combo box if there is only one item. How would I achieve this ? I have tried the below code for hiding the toggle button. But of no luck Any help would be appreciated. thanks <ComboBox x:Name="CList" ItemsSource="{Binding Path=C}" > <Style TargetType="{x:Type ToggleButton}" > <Style.Triggers> <DataTrigger Binding="{Binding Path=Items.Count, ElementName=CList}" Value="1"> <Setter

问题 I'm working on a script to make uClibc usable on an existing glibc-targetted gcc/binutils toolchain, and the one problem I'm left with is that pthread_cancel needs to dlopen libgcc_s.so.1 . The version supplied with the host gcc is linked to depend on glibc, so I'm instead using ld 's -u option to pull in the needed symbols (and their dependencies) from libgcc_eh.a to make a replacement libgcc_s.so.1 : gcc -specs uclibc.specs -Wl,-u,_Unwind_Resume -Wl,-u,__gcc_personality_v0 \ -Wl,-u,_Unwind

问题 I'm working on a script to make uClibc usable on an existing glibc-targetted gcc/binutils toolchain, and the one problem I'm left with is that pthread_cancel needs to dlopen libgcc_s.so.1 . The version supplied with the host gcc is linked to depend on glibc, so I'm instead using ld 's -u option to pull in the needed symbols (and their dependencies) from libgcc_eh.a to make a replacement libgcc_s.so.1 : gcc -specs uclibc.specs -Wl,-u,_Unwind_Resume -Wl,-u,__gcc_personality_v0 \ -Wl,-u,_Unwind

问题 I have a list of links. When one of the links is clicked, I would like to change the visibility of the div associated with it. My html looks like the following: <div id="tab"> <ul> <li id="tab1" class="active"><a href="#">Link 1</a></li> <li id="tab2"><a href="#">Link 2</a></li> <li id="tab3"><a href="#">Link 3</a></li> <li id="tab4"><a href="#">Link 4</a></li> </ul> </div> <div id="content1"><div class="nestedDiv">Content Here</div></div> <div id="content2"><div class="nestedDiv">Content

问题 In my project I add reference on the WPFToolkit assembly, restart Visual Studio and has not seen WPFToolkit components in my VS ToolBox window. What I do wrong? 回答1: Toolbox doesn't automatically pick up components/controls in referenced assemblies. It does however automatically pick up components/controls that are built in your projects. You can right click the toolbox and choose "Customize" and you will get a dialog that lets you browse to the assembly and check off any controls that you

问题 I could find the default visibility of a property and a method in the PHP manual. But i couldn't find any info regarding the class itself. My guess is that it's public. But if someone could link to the part where this is written in the manual i would appreciate it. 回答1: Simply Put Public . PHP doesn't support anything other than public classes. Unlike Java/.NET/etc, there isn't any concept of packages, assemblies, internal or nested classes. Namespaces are essentially just syntactic sugar to

问题 Foreword: What am I going to show you is WRONG and I'm well aware of how bad I am for breaking encapsulation by doing such foolish thing. I'm not trying to solve any more general I/O problem. It's just an experiment. I'm trying to sub-class sun.nio.ch.SourceChannelImpl which is package private class with package private constructor present in JDK (in rt.jar) so I have to create it in sun.nio.ch package. Here is my sub-class: package sun.nio.ch; import java.io.FileDescriptor; import java.nio

问题 Foreword: What am I going to show you is WRONG and I'm well aware of how bad I am for breaking encapsulation by doing such foolish thing. I'm not trying to solve any more general I/O problem. It's just an experiment. I'm trying to sub-class sun.nio.ch.SourceChannelImpl which is package private class with package private constructor present in JDK (in rt.jar) so I have to create it in sun.nio.ch package. Here is my sub-class: package sun.nio.ch; import java.io.FileDescriptor; import java.nio

问题 I have a problem understanding the internal access modifier. In my examples I could not produce any situation where it behaves different then public. Even if I create a jars I can access the internal functions in the jar from outside the jar (from a different package unrelated to the one used in the jar). In the documentation the term module is used but I could not find out what a module is exactly. My questions thus are: what is a module in kotlin? how does the access modifier internal