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This is a list of operators in the C and C++ programming languages.. All listed operators are in C++ and lacking indication otherwise, in C as well. Some tables include a "In C" column that indicates whether an operator is also in C. Note that C does not support operator overloading.
At the time the idiom was introduced (1994), the C++ language did not define a partial ordering for overloaded function templates and, as a result, overloading function templates often resulted in ambiguities. For example, trying to capture a generic definition for operator== as
Scala treats all operators as methods and thus allows operator overloading by proxy. In Raku, the definition of all operators is delegated to lexical functions, and so, using function definitions, operators can be overloaded or new operators added. For example, the function defined in the Rakudo source for incrementing a Date object with "+" is:
Here, attempting to use a non-class type in a qualified name (T::foo) results in a deduction failure for f<int> because int has no nested type named foo, but the program is well-formed because a valid function remains in the set of candidate functions.
The std namespace overloaded non-member operator<< function to handle strings is another example: /*equivalent to operator<<(std::cout, str). The compiler searches the std namespace using ADL due to the type std::string of the str parameter and std::cout */ std :: cout << str ;
The move assignment operator, like most C++ operators, can be overloaded. Like the copy assignment operator it is a special member function . If the move assignment operator is not explicitly defined, the compiler generates an implicit move assignment operator ( C++11 and newer) provided that copy / move constructors , copy assignment operator ...
C++17 restricted several aspects of evaluation order. The new expression will always perform the memory allocation before evaluating the constructor arguments. The operators <<, >>, ., .*, ->*, and the subscript and function call operator are guaranteed to be evaluated left to right (whether they are overloaded or not). For example, the code
In the C++ programming language, the assignment operator, =, is the operator used for assignment.Like most other operators in C++, it can be overloaded.. The copy assignment operator, often just called the "assignment operator", is a special case of assignment operator where the source (right-hand side) and destination (left-hand side) are of the same class type.