symbols

问题 I have a .conf file which looks like this: [offline_online_status] offline_online_status.offline_online_state=ONLINE How can perl read the dot symbol (.) in the value above? Can anybody teach me? 回答1: Try to use this, make your own modification: use CGI; use Config::Tiny; use Data::Dumper; use CGI::Carp qw(fatalsToBrowser); #location/directory of configuration file my $file = "your configuration file path"; my $Config = Config::Tiny->read($file); #reads the section, key and the value of the

问题 for i:=0;i<len(a);i++{ if a[i] != b[i]{ return false } } and just a == b I've found that the same string have different address a := "abc" b := "abc" println(&a) println(&b) answer is : 0xc420045f68 0xc420045f58 so == not using address to compare. In fact, I would like to know how == compares two strings. I am searching for a long time on net. But failed... 回答1: You should use the == operator to compare strings. It compares the content of the string values. What you print is the address of a

问题 I am interested in which symbol file is used when we analyze dump file using Windbg or Visual Studio. Suppose my application is using a utility library, and the utility library has related private symbol file. When there is crash dump in my application, I need the symbol of the utility library to analyze the full call stack. But sometimes the build/runtime/debug environments are installed with different versions of the utility library -- which are (for sure) of different versions of utility

问题 I'm trying to create D3 SVG Symbols, with the symbol shape set dynamically based on a category property in the data. This will be part of a custom visual in PowerBI, so I'm using Typings library. From the examples I've seen online, the below code should work. var milestoneSymbols = this.milestoneContainer.selectAll('.path').data(viewModel.milestones); milestoneSymbols.enter().append('path'); milestoneSymbols.attr('d', d3.svg.symbol() .size(25) .type( function(d){ return d.typeSymbol}) );

问题 I'm working on an ES6 app that sends some of its data over the network. Part of this involves identifiers that are implemented as ES6 Symbol s. For example: const FOO = Symbol('foo'); Calling Foo.toString() yields Symbol(foo) . When I pass these over the network, I'd like to pass it as just foo . However, to my knowledge, there is no way to extract foo from Symbol(foo) other than to pull it out with a regular expression (specifically, /^Symbol\((.*)\)$/ ). Should I rely on the regular

问题 I'm having some problems with my iPhone app not linking for the iPhone Simulator. It tells me there are undefined symbols: Undefined symbols for architecture i386: ".objc_class_name_NSRunLoop", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o ".objc_class_name_NSDate", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o ".objc_class_name_NSAutoreleasePool", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o pointer-to

问题 So I am trying to write a program that asks for you to create a password. I have a block of code that checks to see if the string entered by the user contains a symbol. I have the code set to exit the loop when the boolean value 'validPassword' equals true. string pleaseenterapassword = "Create a password:"; bool validPassword = false; Console.WriteLine(pleaseenterapassword); // Writes to the screen "Create a password:" string password = Console.ReadLine(); //Sets the text entered in the

问题 Unexpected Return Value from Method: Expecting Symbol I have the following Ticket class: class Ticket VALID_STATES = %i[open closed invalid wontfix] attr_reader :status def status= new_state new_state = new_state.to_sym @status = new_state end end When passed a String rather than a Symbol, the setter method unexpectedly returns a String, even though the correct value is being returned by the getter method. For example: t = Ticket.new t.status = 'closed' #=> "closed" t.status #=> :closed It

问题 I have just started using Ruby and I am reading "Programming Ruby 1.9 - The Pragmatic Programmer's Guide". I came across something called symbols, but as a PHP developer I don't understand what they do and what they are good for. Can anyone help me out with this? 回答1: It's useful to think of symbols in terms of "the thing called." In other words, :banana is referring to "the thing called banana." They're used extensively in Ruby, mostly as Hash (associative array) keys. They really are

问题 After trying to figure how to have an effective word counter of a string, I know about the existing function that PHP has str_word_count but unfortunately it doesn't do what I need it to do because I will need to count the number of words that includes English, Chinese, Japanese and other accented characters. However str_word_count fails to count the number of words unless you add the characters in the third argument but this is insane , it could mean I have to add every single character in