/* * Copyright (c) Facebook, Inc. and its affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */ // modifies a & b void array_mod_impure(int a[10], int b[10], int c) { a[0] = c; b[0] = c; } // modifies a twice void array_mod_both_impure(int a[10], int b) { a[0] = b; a[1] = 0; } // modifies a void call_array_mod_impure(int a[10]) { int b[10]; array_mod_impure(a, b, 9); } void call_array_mod_with_fresh_pure() { int a[10]; array_mod_impure(a, a, 0); } // modifies array void alias_mod_impure(int array[], int i, int j) { int* a = array; a[j] = i; } struct Foo { int x; }; void modify_direct_impure(Foo array[10], int i, Foo foo) { array[i].x = foo.x; } void modify_ptr_impure(Foo array[10], Foo foo) { Foo* tmp = array; tmp->x = foo.x; } void call_impure_with_fresh_pure() { struct Foo f1 = {1}; struct Foo f2 = {2}; struct Foo f3 = {3}; Foo array[2] = {f1, f2}; modify_direct_impure(array, 0, f3); modify_ptr_impure(array, f3); } // Note: Unlike C++, in Java, this is gonna be impure because // everything is passed by reference in Java int modify_by_copy_pure(Foo array[1], int i, Foo foo) { Foo tmp = array[i]; tmp.x = foo.x; return tmp.x; }