1 //===- llvm/unittest/ADT/MakeUniqueTest.cpp - std::make_unique unit tests ------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/ADT/STLExtras.h"
10 #include "gtest/gtest.h"
11 
12 using namespace llvm;
13 
14 namespace {
15 
16 // Ensure that there is a default constructor and we can test for a null
17 // function_ref.
18 TEST(FunctionRefTest, Null) {
19   function_ref<int()> F;
20   EXPECT_FALSE(F);
21 
22   auto L = [] { return 1; };
23   F = L;
24   EXPECT_TRUE(F);
25 
26   F = {};
27   EXPECT_FALSE(F);
28 }
29 
30 // Ensure that copies of a function_ref copy the underlying state rather than
31 // causing one function_ref to chain to the next.
32 TEST(FunctionRefTest, Copy) {
33   auto A = [] { return 1; };
34   auto B = [] { return 2; };
35   function_ref<int()> X = A;
36   function_ref<int()> Y = X;
37   X = B;
38   EXPECT_EQ(1, Y());
39 }
40 
41 }
42