Bug #19473. If you pass an allocator to std::function, we should use that allocator, not construct one from scratch. Add a test to make sure

llvm-svn: 206623

1 files changed, 60 insertions, 0 deletions

diff --git a/libcxx/test/support/test_allocator.h b/libcxx/test/support/test_allocator.h
index 99f72a053c3..683fac239f2 100644
--- a/libcxx/test/support/test_allocator.h
+++ b/libcxx/test/support/test_allocator.h
@@ -92,6 +92,66 @@ public:
         {return !(x == y);}
 };
 
+template <class T>
+class non_default_test_allocator
+    : public test_alloc_base
+{
+    int data_;
+
+    template <class U> friend class non_default_test_allocator;
+public:
+
+    typedef unsigned                                                   size_type;
+    typedef int                                                        difference_type;
+    typedef T                                                          value_type;
+    typedef value_type*                                                pointer;
+    typedef const value_type*                                          const_pointer;
+    typedef typename std::add_lvalue_reference<value_type>::type       reference;
+    typedef typename std::add_lvalue_reference<const value_type>::type const_reference;
+
+    template <class U> struct rebind {typedef non_default_test_allocator<U> other;};
+
+//    non_default_test_allocator() throw() : data_(0) {++count;}
+    explicit non_default_test_allocator(int i) throw() : data_(i) {++count;}
+    non_default_test_allocator(const non_default_test_allocator& a) throw()
+        : data_(a.data_) {++count;}
+    template <class U> non_default_test_allocator(const non_default_test_allocator<U>& a) throw()
+        : data_(a.data_) {++count;}
+    ~non_default_test_allocator() throw() {assert(data_ >= 0); --count; data_ = -1;}
+    pointer address(reference x) const {return &x;}
+    const_pointer address(const_reference x) const {return &x;}
+    pointer allocate(size_type n, const void* = 0)
+        {
+            assert(data_ >= 0);
+            if (time_to_throw >= throw_after) {
+#ifndef _LIBCPP_NO_EXCEPTIONS
+                throw std::bad_alloc();
+#else
+                std::terminate();
+#endif
+            }
+            ++time_to_throw;
+            ++alloc_count;
+            return (pointer)std::malloc(n * sizeof(T));
+        }
+    void deallocate(pointer p, size_type n)
+        {assert(data_ >= 0); --alloc_count; std::free(p);}
+    size_type max_size() const throw()
+        {return UINT_MAX / sizeof(T);}
+    void construct(pointer p, const T& val)
+        {::new(p) T(val);}
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    void construct(pointer p, T&& val)
+        {::new(p) T(std::move(val));}
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    void destroy(pointer p) {p->~T();}
+
+    friend bool operator==(const non_default_test_allocator& x, const non_default_test_allocator& y)
+        {return x.data_ == y.data_;}
+    friend bool operator!=(const non_default_test_allocator& x, const non_default_test_allocator& y)
+        {return !(x == y);}
+};
+
 template <>
 class test_allocator<void>
     : public test_alloc_base