Call by reference is used by PL / I and some Fortran systems.
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For example, the call by reference calling convention can be implemented with either explicit or implicit use of references.
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Many languages support call by reference in some form or another, but comparatively few use it as a default . const.
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Data objects were values, not references, and the calling conventions gave a choice between call by value and call by reference for each argument.
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If an argument is call by reference, any parameter mutation will alter the value of the argument outside the function, which will render the function impure.
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The description " call by value where the value is a reference " is common ( but should not be understood as being call by reference ); another term is call by sharing.
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In contrast, " call by reference " and " call by name " semantics allow the parameters to act as aliases of the values passed as arguments, allowing the subroutine to modify variables outside its own scope.
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Notably, while input parameters can be implemented by call by value, and output and input / output parameters by call by reference and this is a straightforward way to implement these modes in languages without built-in support this is not always how they are implemented.
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The semantics of call by copy-restore also differ from those of call by reference where two or more function arguments undefined depending on which of the aliased arguments is copied back first will the copies be made in left-to-right order both on entry and on return?
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In purely functional languages there is typically no semantic difference between the two strategies ( since their data structures are immutable, so there is no possibility for a function to modify any of its arguments ), so they are typically described as call by value even though implementations frequently use call by reference internally for the efficiency benefits.
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