зеркало из https://github.com/microsoft/clang-1.git
97 строки
2.3 KiB
Objective-C
97 строки
2.3 KiB
Objective-C
// RUN: %clang_cc1 -fsyntax-only %s -verify -fblocks
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// test for block type safety.
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@interface Super @end
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@interface Sub : Super @end
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void f2(void(^f)(Super *)) {
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Super *o;
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f(o);
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}
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void f3(void(^f)(Sub *)) {
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Sub *o;
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f(o);
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}
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void r0(Super* (^f)()) {
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Super *o = f();
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}
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void r1(Sub* (^f)()) {
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Sub *o = f();
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}
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@protocol NSObject;
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void r2 (id<NSObject> (^f) (void)) {
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id o = f();
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}
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void test1() {
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f2(^(Sub *o) { }); // expected-error {{incompatible block pointer types passing 'void (^)(Sub *)', expected 'void (^)(Super *)'}}
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f3(^(Super *o) { }); // OK, block taking Super* may be called with a Sub*
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r0(^Super* () { return 0; }); // OK
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r0(^Sub* () { return 0; }); // OK, variable of type Super* gets return value of type Sub*
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r0(^id () { return 0; }); // expected-error {{incompatible block pointer types passing 'id (^)(void)', expected 'Super *(^)()'}}
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r1(^Super* () { return 0; }); // expected-error {{incompatible block pointer types passing 'Super *(^)(void)', expected 'Sub *(^)()'}}
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r1(^Sub* () { return 0; }); // OK
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r1(^id () { return 0; }); // expected-error {{incompatible block pointer types passing 'id (^)(void)', expected 'Sub *(^)()'}}
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r2(^id<NSObject>() { return 0; });
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}
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@interface A @end
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@interface B @end
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void f0(void (^f)(A* x)) {
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A* a;
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f(a);
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}
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void f1(void (^f)(id x)) {
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B *b;
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f(b);
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}
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void test2(void)
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{
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f0(^(id a) { }); // OK
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f1(^(A* a) { }); // expected-error {{incompatible block pointer types passing 'void (^)(A *)', expected 'void (^)(id)'}}
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f1(^(id<NSObject> a) { }); // OK
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}
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@interface NSArray
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// Calls block() with every object in the array
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-enumerateObjectsWithBlock:(void (^)(id obj))block;
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@end
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@interface MyThing
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-(void) printThing;
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@end
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@implementation MyThing
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static NSArray* myThings; // array of MyThing*
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-(void) printThing { }
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// programmer wants to write this:
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-printMyThings1 {
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[myThings enumerateObjectsWithBlock: ^(MyThing *obj) { // expected-error {{incompatible block pointer types sending 'void (^)(MyThing *)', expected 'void (^)(id)'}}
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[obj printThing];
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}];
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}
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// strict type safety requires this:
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-printMyThings {
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[myThings enumerateObjectsWithBlock: ^(id obj) {
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MyThing *obj2 = (MyThing *)obj;
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[obj2 printThing];
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}];
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}
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@end
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