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Terminates the current function and returns the specified value (if any) to its caller.
|
[edit]Syntax
attr(optional)return expression(optional); | (1) | |
attr(optional)return braced-init-list; | (2) | (since C++11) |
attr(optional)co_return expression(optional); | (3) | (since C++20) |
attr(optional)co_return braced-init-list; | (4) | (since C++20) |
attr(C++11) | - | optional sequence of any number of attributes |
expression | - | expression, convertible to the function return type |
braced-init-list | - | brace-enclosed list of initializers and other braced-init-lists |
[edit]Explanation
1) Evaluates the expression, terminates the current function and returns the result of the expression to the caller, after implicit conversion to the function return type. The expression is optional in functions whose return type is (possibly cv-qualified) void, and disallowed in constructors and in destructors.
2) Uses copy-list-initialization to construct the return value of the function.
3,4) In a coroutine, the keyword co_return must be used instead of return for the final suspension point (see coroutines for details).
[edit]Notes
If control reaches the end of a function with the return type
void
(possibly cv-qualified), end of a constructor, end of a destructor, or the end of a function-try-block for a function with the return type (possibly cv-qualified) void
without encountering a return statement, return; is executed.If control reaches the end of the main function, return0; is executed.
Flowing off the end of a value-returning function (except main) without a return statement is undefined behavior.
In a function returning void, the return statement with expression can be used, if the expression type is void.
The copy-initialization of the result of the function call is sequenced-before the destruction of all temporaries at the end of expression, which, in turn, is sequenced-before the destruction of local variables of the block enclosing the return statement. | (since C++14) |
Dev C++ Programs
Returning by value may involve construction and copy/move of a temporary object, unless copy elision is used. Specifically, the conditions for copy/move are as follows:
automatic move from local variables and parametersIf expression is a (possibly parenthesized) id-expression that names a variable whose type is either
, and that variable is declared
then overload resolution to select the constructor to use for initialization of the returned value or, for co_return, to select the overload of promise.return_value()(since C++20) is performed twice:
| (since C++11) |
guaranteed copy elisionIf expression is a prvalue, the result object is initialized directly by that expression. This does not involve a copy or move constructor when the types match (see copy elision). | (since C++17) |
[edit]Keywords
return,co_return
[edit]Example
Output:
[edit]Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
CWG 1579 | C++11 | return by converting move constructor was not allowed | converting move constructor look up enabled |
CWG 1885 | C++14 | sequencing of the destruction of automatic variables was not explicit | sequencing rules added |
[edit]See also
C documentation for return statement |
Retrieved from 'https://en.cppreference.com/mwiki/index.php?title=cpp/language/return&oldid=115005'
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Description
The C library function void exit(int status) terminates the calling process immediately. Any open file descriptors belonging to the process are closed and any children of the process are inherited by process 1, init, and the process parent is sent a SIGCHLD signal.
Declaration
Following is the declaration for exit() function.
Parameters
- status − This is the status value returned to the parent process.
Return Value
Dev C++ Process Exited With Return Value 0
This function does not return any value.
Dev C Return 0 1
Example
Nintendo ds download rom. The following example shows the usage of exit() function.
Let us compile and run the above program that will produce the following result −
Dev C++ Return 0 Nedir
Dev C++ Return 0 Hatası
stdlib_h.htm