parenthesis

Do I need to parenthesise yield in Ruby?

In Ruby I can use result << (yield element) and everything works, but if I do result.push(yield element) I get a warning about needing parentheses for future compatibility. I can change the above to result.push(yield(element)) and the interpreter is happy again, but I don't understand why I need parentheses in one call to yield ...

Lua Closures in implementing a DSL

Lua has a really nice no-parenthesis call syntax that coupled with function closures allow me to write the following local tag = 1 function test(obj) return function(str) return function (tbl) tbl.objtag = tag tbl.objname = str return tbl end end end test (tag) "def" { } test tag ...

Remove Text Between Parentheses PHP

Hi, I'm just wondering how I could remove the text between a set of parentheses and the parentheses themselves in php. Example : ABC (Test1) I would like it to delete (Test1) and only leave ABC Thanks ...

Parenthesis operator in C. What is the effect in the following code

Hi everyone, I was playing with a macro to enable/disable traces when I came out with the following code when the macro is disabled: int main() { ("Hello world"); } This code is valid and I got the desired effect (nothing happens when the macro is disabled) but I couldn't figure out what exactly is happening. Is the compiler seei...

python assert with and without parenthesis

Here are four simple invocations of assert: >>> assert 1==2 Traceback (most recent call last): File "<stdin>", line 1, in ? AssertionError >>> assert 1==2, "hi" Traceback (most recent call last): File "<stdin>", line 1, in ? AssertionError: hi >>> assert(1==2) Traceback (most recent call last): File "<stdin>", line 1, in ? Asser...

C++ function parameter as reference

Hi, I have a question. Can anyone tell me why someone would declare parameter r like that ? Whats the difference between Record& r and Record(&r) ? QDataStream& operator>>(QDataStream &s, Record(&r)) { } Thanks :) ...

How to make parenthesis matching work in XEmacs?

I tried using all options in the menu setting Options|Display|Paren Highlighting, but nothing works - no parenthesis match is performed. I also tried setting explicitly (paren-mode 'blink-paren t) in my init file, but that did not help either. Any ideas what may be happening and how do I fix it? Thanks. ...

Jquery/Javascript Math: Why are these two 1 line math problems not giving the same answer?

Shouldn't these two math problems give the same answer? Brackets/parenthesis are done first, right? so it should add them all, then divide it by 2, then subtract 10. The second answer below is the one giving me the correct value that I need, the other one gives a value that's a long ways off. var pleft = $(this).offset().left + ($(t...