| <Syntax> |
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INTERFACE ASSIGNMENT(=)
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| <Semantics> |
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The INTERFACE ASSIGNMENT statement is an INTERFACE statement that begins a generic interface block.
This interface block declares (additional) specific procedures for the assignment statement.
A procedure that implements assignment shall be a subroutine with exactly two arguments;
the first argument shall have INTENT(OUT) or INTENT(INOUT),
and the second argument shall have INTENT(IN).
When an assignment statement
variable = expression
has a left-hand-side (variable) that matches the first argument of a specific procedure S,
and a right-hand-side (expression) that matches the second argument of S,
the procedure is called as if the statement had been written
CALL S ( variable , ( expression ) )
Note the extra parentheses around the expression: this forces a copy to be made,
to avoid any problem if variable and expression happen to overlap.
Note: An assignment procedure cannot replace intrinsic assignment, except for derived-type assignment.
This means that, e.g., "X = 3" where X is Real, is always the intrinsic assignment.
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| <Related> |
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END INTERFACE statement,
INTERFACE statement,
INTERFACE OPERATOR statement,
MODULE PROCEDURE statement |
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