140 lines
4.1 KiB
C++
140 lines
4.1 KiB
C++
//===- unittests/ErrorOrTest.cpp - ErrorOr.h 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/Support/ErrorOr.h"
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#include "llvm/Support/Errc.h"
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#include "gtest/gtest.h"
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#include <memory>
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using namespace llvm;
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namespace {
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ErrorOr<int> t1() { return 1; }
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ErrorOr<int> t2() { return errc::invalid_argument; }
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TEST(ErrorOr, SimpleValue) {
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ErrorOr<int> a = t1();
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// FIXME: This is probably a bug in gtest. EXPECT_TRUE should expand to
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// include the !! to make it friendly to explicit bool operators.
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EXPECT_TRUE(!!a);
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EXPECT_EQ(1, *a);
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ErrorOr<int> b = a;
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EXPECT_EQ(1, *b);
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a = t2();
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EXPECT_FALSE(a);
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EXPECT_EQ(a.getError(), errc::invalid_argument);
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#ifdef EXPECT_DEBUG_DEATH
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EXPECT_DEBUG_DEATH(*a, "Cannot get value when an error exists");
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#endif
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}
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ErrorOr<std::unique_ptr<int> > t3() {
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return std::unique_ptr<int>(new int(3));
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}
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TEST(ErrorOr, Types) {
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int x;
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ErrorOr<int&> a(x);
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*a = 42;
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EXPECT_EQ(42, x);
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// Move only types.
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EXPECT_EQ(3, **t3());
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}
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struct B {};
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struct D : B {};
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TEST(ErrorOr, Covariant) {
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ErrorOr<B*> b(ErrorOr<D*>(nullptr));
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b = ErrorOr<D*>(nullptr);
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ErrorOr<std::unique_ptr<B> > b1(ErrorOr<std::unique_ptr<D> >(nullptr));
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b1 = ErrorOr<std::unique_ptr<D> >(nullptr);
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ErrorOr<std::unique_ptr<int>> b2(ErrorOr<int *>(nullptr));
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ErrorOr<int *> b3(nullptr);
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ErrorOr<std::unique_ptr<int>> b4(b3);
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}
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TEST(ErrorOr, Comparison) {
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ErrorOr<int> x(errc::no_such_file_or_directory);
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EXPECT_EQ(x, errc::no_such_file_or_directory);
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}
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TEST(ErrorOr, ImplicitConversion) {
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ErrorOr<std::string> x("string literal");
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EXPECT_TRUE(!!x);
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}
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TEST(ErrorOr, ImplicitConversionCausesMove) {
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struct Source {};
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struct Destination {
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Destination(const Source&) {}
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Destination(Source&&) = delete;
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};
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Source s;
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ErrorOr<Destination> x = s;
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EXPECT_TRUE(!!x);
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}
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TEST(ErrorOr, ImplicitConversionNoAmbiguity) {
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struct CastsToErrorCode {
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CastsToErrorCode() = default;
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CastsToErrorCode(std::error_code) {}
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operator std::error_code() { return errc::invalid_argument; }
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} casts_to_error_code;
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ErrorOr<CastsToErrorCode> x1(casts_to_error_code);
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ErrorOr<CastsToErrorCode> x2 = casts_to_error_code;
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ErrorOr<CastsToErrorCode> x3 = {casts_to_error_code};
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ErrorOr<CastsToErrorCode> x4{casts_to_error_code};
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ErrorOr<CastsToErrorCode> x5(errc::no_such_file_or_directory);
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ErrorOr<CastsToErrorCode> x6 = errc::no_such_file_or_directory;
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ErrorOr<CastsToErrorCode> x7 = {errc::no_such_file_or_directory};
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ErrorOr<CastsToErrorCode> x8{errc::no_such_file_or_directory};
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EXPECT_TRUE(!!x1);
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EXPECT_TRUE(!!x2);
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EXPECT_TRUE(!!x3);
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EXPECT_TRUE(!!x4);
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EXPECT_FALSE(x5);
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EXPECT_FALSE(x6);
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EXPECT_FALSE(x7);
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EXPECT_FALSE(x8);
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}
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// ErrorOr<int*> x(nullptr);
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// ErrorOr<std::unique_ptr<int>> y = x; // invalid conversion
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static_assert(
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!std::is_convertible<const ErrorOr<int *> &,
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ErrorOr<std::unique_ptr<int>>>::value,
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"do not invoke explicit ctors in implicit conversion from lvalue");
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// ErrorOr<std::unique_ptr<int>> y = ErrorOr<int*>(nullptr); // invalid
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// // conversion
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static_assert(
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!std::is_convertible<ErrorOr<int *> &&,
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ErrorOr<std::unique_ptr<int>>>::value,
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"do not invoke explicit ctors in implicit conversion from rvalue");
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// ErrorOr<int*> x(nullptr);
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// ErrorOr<std::unique_ptr<int>> y;
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// y = x; // invalid conversion
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static_assert(!std::is_assignable<ErrorOr<std::unique_ptr<int>>&,
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const ErrorOr<int *> &>::value,
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"do not invoke explicit ctors in assignment");
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// ErrorOr<std::unique_ptr<int>> x;
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// x = ErrorOr<int*>(nullptr); // invalid conversion
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static_assert(!std::is_assignable<ErrorOr<std::unique_ptr<int>>&,
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ErrorOr<int *> &&>::value,
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"do not invoke explicit ctors in assignment");
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} // end anon namespace
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