symbols

I'm new to the Ruby and Ruby on Rails world. I've read some guides, but i've some trouble with the following syntax. I think that the usage of :condition syntax is used in Ruby to define a class attribute with some kind of accessor, like: class Sample attr_accessor :condition end that implicitly declares the getter and setter for the "condition" property. While i was looking at some Rails sample code, i found the following examples that i don't fully understand. For example: @post = Post.find(params[:id]) Why it's accessing the id attribute with this syntax, instead of: @post = Post.find

Today i noticed that html symbols such as: ★ are being displayed in my database as a question mark. I'm using varchar as type and the database i am using is microsoft sql 2008. Does anyone know a fix for this? You need to use NVARCHAR datatype for your column, VARCHAR datatype can only be use for non-unicode character. if you are storing unicode characters in your datatype you should use NVARCHAR datatypes and when inserting Data into your Column use the N prefix telling sql server there will be some unicode characters in the passed string. With VARCHAR DataType CREATE TABLE #Temp (Column1

I was figuring out a problem where starting the application from GDB results in a symbol lookup error, but starting it from the shell works. It turns out that whenever you start a program from within GDB it will start a new shell and thus override all environment variables I had set before starting GDB (like LD_LIBRARY_PATH ). This is not really the behavior I want. Can someone explain the rationale behind this, or tell me how I can turn this off? I am guessing that you unconditionally set LD_LIBRARY_PATH in your ~/.cshrc or the like. So if from a shell prompt you do this: export LD_LIBRARY

I'm working on a C++ project that needs two third party libraries ( libfoo.so and libbar.so ). My operating system is Linux. libfoo.so is dynamically linked to libpng14.so.14 (1.4.8) (EDIT 1) libbar.so seems to be statically linked to an unknwon version of libpng libpng 1.2.8 (EDIT 1) I say "seems to be" because: ldd libbar.so doesn't show nothing about png nm -D libbar.so | grep png_read_png says "004f41b0 T png_read_png" less libbar.so | grep png_read_png says "4577: 004f41b0 738 FUNC GLOBAL DEFAULT 10 png_read_png" When i start my program, it abort: terminate called after throwing an

Possible Duplicate: What is the “??” operator for? I saw a line of code which states - return (str ?? string.Empty).Replace(txtFind.Text, txtReplace.Text); I want to know the exact meaning of this line(i.e. the ?? part).. It's the null coalescing operator : it returns the first argument if it's non null, and the second argument otherwise. In your example, str ?? string.Empty is essentially being used to swap null strings for empty strings. It's particularly useful with nullable types, as it allows a default value to be specified: int? nullableInt = GetNullableInt(); int normalInt = nullableInt

I used Lyx (a Latex distribution) to convert my content to an HTML page. I noticed that the sigma symbol represented in firefox is composed of these 2 characters: ⎲ ⎳ The first character is for the upper part of Sigma symbol, and second character is for the lower part. I tried to search Google for these "weird" characters but could not find anything. Do those characters even belong to ASCII? Can somebody tell me where I can find those weird characters? It are characters which are specified by Unicode which can cover over one million characters. Practically every character the mankind is aware

There is a .toString() on Symbol in ES6 which returns the string representation of Symbol , but wondering why '' + Symbol() doesn't work (run this expression throws out TypeError which I don't expect)? Is the latter just calling .toString() on a new Symbol and append ( + ) it to empty string? Is the latter just calling .toString() on a new Symbol and append ( + ) it to empty string? No actually, Symbols cannot be implicitly cast to strings, or numbers, although interestingly enough you can implicitly cast them to a boolean. MDN actually has a section on some of these pitfalls: Symbol type

I want to build a console-like output using JTextPane. Therefore I am using a monospaced font: textpane.setFont(new Font(Font.MONOSPACED, Font.PLAIN, 12)); This works fine for all kind of alphanum (like a-z, 0-9 etc.) characters, but when it comes to symbols like ' \u2588 ' (█), the font isn't monospaced anymore. Did I forgot something? Or isn't there a monospaced font which includes smybols? CodeBlind Ok, first off, it sounds to me like you're trying to address a couple of different things here, so I'll try to address them both separately. 1. You need a font that is monospaced for all unicode