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63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
//===- llvm/unittest/ADT/FunctionRefTest.cpp - function_ref unit tests ----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/STLExtras.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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// Ensure that there is a default constructor and we can test for a null
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// function_ref.
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TEST(FunctionRefTest, Null) {
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function_ref<int()> F;
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EXPECT_FALSE(F);
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auto L = [] { return 1; };
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F = L;
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EXPECT_TRUE(F);
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F = {};
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EXPECT_FALSE(F);
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}
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// Ensure that copies of a function_ref copy the underlying state rather than
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// causing one function_ref to chain to the next.
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TEST(FunctionRefTest, Copy) {
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auto A = [] { return 1; };
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auto B = [] { return 2; };
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function_ref<int()> X = A;
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function_ref<int()> Y = X;
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X = B;
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EXPECT_EQ(1, Y());
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}
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TEST(FunctionRefTest, BadCopy) {
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auto A = [] { return 1; };
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function_ref<int()> X;
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function_ref<int()> Y = A;
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function_ref<int()> Z = static_cast<const function_ref<int()> &&>(Y);
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X = Z;
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Y = nullptr;
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ASSERT_EQ(1, X());
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}
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// Test that overloads on function_refs are resolved as expected.
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std::string returns(StringRef) { return "not a function"; }
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std::string returns(function_ref<double()> F) { return "number"; }
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std::string returns(function_ref<StringRef()> F) { return "string"; }
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TEST(FunctionRefTest, SFINAE) {
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EXPECT_EQ("not a function", returns("boo!"));
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EXPECT_EQ("number", returns([] { return 42; }));
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EXPECT_EQ("string", returns([] { return "hello"; }));
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}
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} // namespace
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