llvm-project/clang/test/SemaCXX/blocks.cpp

// RUN: %clang_cc1 -fsyntax-only -verify %s -fblocks
// expected-no-diagnostics

void tovoid(void*);

void tovoid_test(int (^f)(int, int)) {
  tovoid(f);
}

void reference_lvalue_test(int& (^f)()) {
  f() = 10;
}

// PR 7165
namespace test1 {
  void g(void (^)());
  struct Foo {
    void foo();   
    void test() {
      (void) ^{ foo(); };
    }
  };
}

namespace test2 {
  int repeat(int value, int (^block)(int), unsigned n) {
    while (n--) value = block(value);
    return value;
  }

  class Power {
    int base;

  public:
    Power(int base) : base(base) {}
    int calculate(unsigned n) {
      return repeat(1, ^(int v) { return v * base; }, n);
    }
  };

  int test() {
    return Power(2).calculate(10);
  }
}

// rdar: // 8382559
namespace radar8382559 {
  void func(bool& outHasProperty);

  int test3() {
    __attribute__((__blocks__(byref))) bool hasProperty = false;
    bool has = true;

    bool (^b)() = ^ {
     func(hasProperty);
     if (hasProperty)
       hasProperty = 0;
     if (has)
       hasProperty = 1;
     return hasProperty;
     };
    func(hasProperty);
    func(has);
    b();
    if (hasProperty)
      hasProperty = 1;
    if (has)
      has = 2;
    return hasProperty = 1;
  }
}