Regarding programming languages, operators are constructs which behave generally like functions, but which differ syntactically or semantically from usual functions. From Wikipedia: http://en.wikipedia.org/wiki/Operator_%28programming%29

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51 views

What's the lhs/rhs equivlent of a single parameter? [closed]

Typical operator overloading conventions go like this: MyObject operator+(const MyObject& lhs, const MyObject& rhs) { return MyObject(lhs.my_value + rhs.my_value); } What would be the ...
0
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0answers
61 views

What does the const keyword do in an operator definition? [migrated]

I don't understand what the const keyword is used for in front of the return type and after the parameter list of this operator definition. This is taken from an example from a book. const char& ...
-1
votes
2answers
140 views

How does the post increment operator work in GNU C? [closed]

While the run the below program in Turbo C compiler, I am getting the expected output, however, when I run the same program it using "gcc" compiler in linux, it is giving an unexpected output! int ...
9
votes
1answer
313 views

Why it is not possible to overload compound assignment operator in C#?

The title is be misleading, so please read entire question :-). By "compound assignment operator" I have in mind a construct like this op=, for example +=. Pure assignment operator (=) does not ...
2
votes
1answer
125 views

What is the etymology of the “dot” operator for string concatenation?

Some languages have a . operator for string concatenation. The oldest language I could find that supports it is Perl. Was Perl the first to use it? Why was it chosen?
77
votes
7answers
7k views

Short circuit evaluation, is it bad practice?

Something that I've known for a while but never considered is that in most languages it is possible to give priority to operators in an if statement based on their order. I often use this as a way to ...
5
votes
2answers
337 views

When should I use C#'s implicit type conversion operator?

In C#, we can overload the implicit conversion operator like this (example from MSDN): struct Digit { /* ... */ public static implicit operator byte(Digit d) // implicit digit to byte ...
1
vote
1answer
276 views

What is the “->” symbol called?

I have seen the -> operator/symbol in Java 8 predicates recently and wondered what its name is. I know that it is used in lambda expressions, but I know that the symbol for lambda is λ, so that's ...
2
votes
1answer
246 views

Well defined mathematical operations for bearing (angle) class

I have written a class to represent bearings (angles with a nautical theme, and a specific normalisation range). In the program, it is necessary to perform some mathematical operations on them, so ...
0
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2answers
197 views

Missing `$` like operators in Haskell

Below I've produced what I believe to be a summary of the standard $ like operators for various classes in Haskell. There's some gaps however. Following the applicative pattern, you would think those ...
4
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2answers
359 views

Implicit Conversion Operators for Value Types in C#

I’ve come across this blog article: Implicit Conversion Operators are Bad. The article discourages the use of implicit conversion with reference types. The article describes problems caused by ...
3
votes
1answer
408 views

How do you set and check a single bit in a programming language that does not support bitwise operations?

I'm using a programming language (more a scripting language) that does not support any bitwise operators like AND, OR, XOR, NOT (and shift as well). Common arithmetic and logical operations like + - ...
0
votes
1answer
122 views

Is it correct to call the assignment symbol an “operator” when it is actually a statement?

In some languages (C++, Java, Ruby, etc.) an assignment returns a value and can be used in an expression: x = (y = z); // ok, 'x' gets the value of 'z' In other languages (Ada, VHDL), an ...
3
votes
4answers
410 views

Lexing: One token per operator, or one universal operator token?

When lexing, what would be the best way to tokenize operators? Would one just create a BinaryOperator token, or a separate token for every single binary operator? Examples: PlusOperator, ...
2
votes
2answers
1k views

Speeds of << >> multiplication and division

You can use << to multiply and >> to divide numbers in python when I time them I find using the binary shift way of doing it is 10x faster than dividing or multiplying the regular way. ...
28
votes
3answers
2k views

Why does the boolean type in C++ support `++` but not `--`?

Why does the operator -- not exist for bool whereas it does for operator ++? I tried in C++, and I do not know if my question apply to another language. I will glad to know also. I know, I can use ...
24
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9answers
4k views

What is the benefit of having the assignment operator return a value?

I'm developing a language which I intend to replace both Javascript and PHP. (I can't see any problem with this. It's not like either of these languages have a large install base.) One of the things ...
0
votes
5answers
261 views

Why is it bad to use redundancy with logical operators? [duplicate]

I'm moving over to work on a library that a fellow developer has been writing. It's full of == true and == false, which I find crazy frustrating to read. I've tried asking him to quit doing it, but ...
3
votes
3answers
568 views

Specifics of Switch and If statements

Why do we need the switch statement if there is the if statement? Why can't we use several ifs like if(a==1) do this1; if(a==2) do this2; ... instead of switch (a) { case(1): {do ...
5
votes
2answers
433 views

Why isn't exponentiation hardware-implemented?

Why is there no exponentiation operation in hardware, even though many languages have builtin operators for it? Is it because even hardware implementations would need to use the same algorithm as ...
2
votes
1answer
369 views

Languages supporting unicode logic operators

Are there any programming languages that support the use of unicode logic operators? For example, many programming languages use "!=" as the "does not equal" operator, but in mathematics the symbol ...
1
vote
2answers
382 views

Should ** bind more tightly than !, ~?

Designing a programming language, I'm including the ** exponentiation operator. In Fortran and Python, the two languages I know of which have this operator, it binds more tightly than unary minus, ...
9
votes
4answers
4k views

Instantiating Null Objects with Null-Coalescing Operator

Consider the following typical scenario: if(myObject == null) { myObject = new myClass(); } I'm wondering what is thought of the following replacement using the null-coalescing operator: ...
0
votes
3answers
408 views

Any languages use the '=>' and '=<' operators? [closed]

I'm just curious if there are any programming languages that use the '=>' and '=<' operators for something. I wonder why these are not commonly used when their variant '<=' and '>=' are so ...
4
votes
2answers
1k views

What do you call parentheses operators?

In most programming languages documentation where they talk about operators +-*/=<> they also include ()[] as operators. There are unary operators, multiplicative operators, additive operators, ...
1
vote
1answer
80 views

Operator distributivity in expressions - syntactic sugar

When writing boolean expressions out, you often have to use something of the type: A == any of B1, ..., Bn C < all of D1, ..., Dm But in code you have to use expanded forms: A == B1 or ... or A ...
0
votes
3answers
433 views

Using Power of 2 numbers to represent types

Let's say that we have some values, represented by power of 2: TYPE_1 = 1 TYPE_2 = 2 TYPE_3 = 4 TYPE_4 = 8 ... I need to store some of these types in one value. Example: To represent TYPE_1 with ...
2
votes
1answer
115 views

How does the ? make a quantifier lazy in regex [closed]

I've been looking into regex lately and figured that the ? operator makes the *,+, or ? lazy. My question is how does it do that? Is it that *? for example is a special operator, or does the ? have ...
42
votes
2answers
2k views

Why do bitwise operators have lower priority than comparisons?

Could someone explain the rationale, why in a bunch of most popular languages (see note below) comparison operators (==, !=, <, >, <=, >=) have higher priority than bitwise operators (&, |, ...
42
votes
6answers
7k views

Why didn't == operator string value comparison make it to Java?

Every competent Java programmer knows that you need to use String.equals() to compare a string, rather than == because == checks for reference equality. When I'm dealing with strings, most of the ...
0
votes
2answers
301 views

How to extract operators from the grammar productions for conflict resolution in LALR parser?

Is there some standardized or widely accepted algorithm for picking up operators in shift/reduce conflicts in LALR parser? The question is naive, my problem is not with implementing my solution, but ...
87
votes
16answers
25k views

Why aren't user-defined operators more common?

One feature I miss in from functional languages is the idea that operators are just functions, so adding a custom operator is often as simple as adding a function. Many procedural languages allow ...
4
votes
2answers
779 views

Which are the fundamental stack manipulation operations?

I'm creating a stack oriented virtual machine, and so I started learning Forth for a general understanding about how it would work. Then I shortlisted the essential stack manipulation operations I ...
8
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2answers
747 views

What is the justification for Python's power operator associating to the right?

I am writing code to parse mathematical expression strings, and noticed that the order in which chained power operators are evaluated in Python differs from the order in Excel. From ...
2
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5answers
1k views

Is Operator Overloading supported in C

When I read about the LCC (Windows) compiler, I found out it has the implementation for operator overloading. However, after a bit of Googling, I've confirmed that operator overloading isn't ...
2
votes
4answers
4k views

Can I change operator precedence and associativity in C++?

As the title says, I find it useful to be able to overload operators. Is it possible to also change the way the operators are parsed by specifying the precedence and associativity of overridden ...
0
votes
1answer
335 views

Overloading Operators - C++

I was experimenting with new overloaded operators, I have created one void operator and another one that returns something when it's called: #include <iostream> struct chichachicha{ int ...
15
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3answers
3k views

Why isn't the arrow operator in C++ just an alias of *.?

In c++, the * operator can be overloaded, such as with an iterator, but the arrow (->) (.*) operator does not work with classes that overload the * operator. I imagine that the preprocessor could ...
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votes
1answer
270 views

Is this common amongst many languages?

In C++, the integer variable bar evaluates to 1 in this code int foo = 0; int bar = ++foo; and 0 in this code int foo = 0; int bar = foo++; Is this behavior prevalent in most popular languages?
11
votes
7answers
758 views

Are operators clearer to read than keywords or functions? [closed]

It's a bit subjective, but I'm hoping to get a clearer understanding of what factors make an operator clear to use vs obtuse and difficult. I've been considering language designs recently, and one ...
5
votes
3answers
10k views

Ternary operator (condition ? foo : bar) and the XOR (^) operator

I have read in a recent code review that both ternary operator (condition ? foo : bar) and the XOR operator ^ are rarely used in Java. Is it true? If yes, is this because they are less readable? or ...
12
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11answers
8k views

Examples of operator overloading, which make sense

While I learning C#, I found that, the C# supports operator overloading. I have problem with good example which: Make sense (ex. adding class named sheep and cow) Is not an example of concatenation ...
9
votes
4answers
2k views

Using PHP's ternary operator with only two arguments

I was recently reviewing some of my code and noticed that in a fit of absent-mindedness, I'd left a structure like the following: $guid = empty($subscription->guid) ? : $subscription->guid; ...
26
votes
10answers
3k views

Is there any reason why most programming languages don't have '!>' (not greater than) and '!<' (not less than) operators?

I wonder if there is any reason - or if it is just an accident of history - that there are no !> and !< operators in most programming languages? a >= b (a greater OR equals b) could be ...
22
votes
3answers
13k views

What is the name of ** in python?

When programming Python I sometimes do a ** to make a conversion. I understand what it does but what data structures am I manipulating? A dict and what is the other? An array? Is there a name for the ...
5
votes
2answers
3k views

Do any languages use =/= for the inequality operator?

Wikipedia says: Not equal The symbol used to denote inequation — when items are not equal — is a slashed equals sign "≠" (Unicode 2260). Most programming languages, limiting themselves ...
4
votes
8answers
1k views

Comparison of operator overloading abuse in different languages

A common argument against operator overloading is that it can be and is abused, e.g. A+B doing something completely different to addition. Examples are often quoted in C++ snippets, where the ...
2
votes
4answers
184 views

What should I call the less-than and similar operators?

Most programming languages support operators similar to the following 6, which are spelled here as in C. == != < <= > >= I'm aware of several terms used to include all of these ...
3
votes
2answers
783 views

Why do more languages not support ===

I mean it as it is used in JavaScript. Just curious why this is not supported in more languages? Like Java for example does not have it? Seems to be a very useful operator to have.
18
votes
15answers
3k views

What are bit operators good for? [closed]

Programming languages often come with various bit operators (e.g. bitwise left- and right shift, bitwise AND, OR, XOR...). These don't get used though very much, or at least such has my experience ...