It was introduced because plus operator can have different meaning in many situations. Tilde operator can be overloaded for user types, and binary tilde operator is mostly used to merging two objects, or adding some objects to set of objects. In the D programming language, the tilde is used as an array concatenation operator, as well as to indicate an object destructor and binary not operator.
In the CSS stylesheet language, the tilde is used for the indirect adjacent combinator as part of a selector. In C++ and C#, the tilde is also used as the first character in a class's method name (where the rest of the name must be the same name as the class) to indicate a destructor – a special method which is called at the end of the object's life. In the C, C++ and C# programming languages, the tilde character is used as bitwise NOT operator, following the notation in logic (an ! causes a logical NOT, instead). In APL and MATLAB, tilde represents the monadic logical function NOT. variable !~ / regex/ returns false if the variable is matched.Ī variant of this, with the plain tilde replaced with =~, was adopted in Perl, and this semi-standardization has led to the use of these operators in other programming languages, such as Ruby or the SQL variant of the database PostgreSQL.variable ~ / regex/ returns true if the variable is matched.
The tilde is used in the AWK programming language as part of the pattern match operators for regular expressions:
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