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StructuredBindingTests.java
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StructuredBindingTests.java
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/*******************************************************************************
* Copyright (c) 2018 Institute for Software, HSR Hochschule fuer Technik
* Rapperswil, University of applied sciences.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Thomas Corbat (IFS) - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.core.parser.tests.ast2.cxx17;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.char_;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.constInt;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.double_;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.float_;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.int_;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.referenceTo;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.referenceToConstInt;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.referenceToInt;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.rvalueReferenceTo;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.rvalueReferenceToInt;
import static org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes.volatileOf;
import org.eclipse.cdt.core.dom.ast.IASTImplicitName;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IValue;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
import org.eclipse.cdt.core.parser.tests.ast2.AST2CPPTestBase;
import org.eclipse.cdt.core.parser.tests.ast2.CommonCPPTypes;
import org.eclipse.cdt.internal.core.dom.parser.CompositeValue;
import org.eclipse.cdt.internal.core.dom.parser.FloatingPointValue;
import org.eclipse.cdt.internal.core.dom.parser.IntegralValue;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPStructuredBindingComposite;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPEvaluation;
public class StructuredBindingTests extends AST2CPPTestBase {
//struct S {
// int first;
// double second;
//};
//auto [f1, s1] = S{1, 2};
//auto f2 = f1;
//auto s2 = s1;
public void testFromTemporary() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
IBinding f1Declaration = helper.assertNonProblem("f1, ", 2);
IBinding f1Reference = helper.assertNonProblem("f1;", 2);
assertSame(f1Declaration, f1Reference);
IBinding s1Declaration = helper.assertNonProblem("s1] ", 2);
IBinding s1Reference = helper.assertNonProblem("s1;", 2);
assertSame(s1Declaration, s1Reference);
}
//struct S {
// int first;
// double second;
//};
//S createS() {
// return {1, 2};
//}
//auto [f, s] = createS();
public void testFromReturnValue() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f,", 1), int_);
assertType(helper.assertNonProblem("s]", 1), double_);
}
//struct S {
// int first;
// double second;
//};
//S createS() {
// return {1, 2};
//}
//auto [f, s]{createS()};
public void testBracedInitialization() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f,", 1), int_);
assertType(helper.assertNonProblem("s]", 1), double_);
}
//struct S {
// int first;
// double second;
//};
//S createS() {
// return {1, 2};
//}
//auto [f, s](createS());
public void testCopyInitialization() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f,", 1), int_);
assertType(helper.assertNonProblem("s]", 1), double_);
}
//struct S {
// int first;
// int second;
// float third;
// double fourth;
// char fifth;
//};
//auto [f, s, t, fo, fif] = S{1, 2, 1.5f, 3.1415, '*'};
public void testWithManyInitializers() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f,", 1), int_);
assertType(helper.assertNonProblem("s,", 1), int_);
assertType(helper.assertNonProblem("t,", 1), float_);
assertType(helper.assertNonProblem("fo,", 2), double_);
assertType(helper.assertNonProblem("fif]", 3), char_);
}
//struct Base {
// int bi;
//};
//struct Sub : Base {
// static double sd;
//};
//auto [b] = Sub{1};
public void testWithBaseClass() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("b]", 1), int_);
}
//auto f() -> int(&)[2];
//auto [x, y] = f();
//auto & [xr, yr] = f();
public void testStandardExample1() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("xr,", 2), referenceToInt);
assertType(helper.assertNonProblem("yr]", 2), referenceToInt);
}
//struct S {
// int x1 : 2;
// volatile double y1;
//};
//S createS();
//auto const [x, y] = createS();
public void testStandardExample2() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("x,", 1), constInt);
assertType(helper.assertNonProblem("y]", 1), CommonCPPTypes.constVolatileOf(double_));
}
//int arr[]{1, 2, 3};
//auto [f, s, t] = arr;
public void testFromArray() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f,", 1), int_);
assertType(helper.assertNonProblem("s,", 1), int_);
assertType(helper.assertNonProblem("t]", 1), int_);
}
//struct S {
// int i;
//} s{};
//auto && [f] = s;
public void testForwardingReferenceWithLvalue() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f]", 1), referenceToInt);
}
//struct S {
// int i;
//} s{};
//auto && [f] = static_cast<S&&>(s);
public void testForwardingReferenceWithXvalue() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f]", 1), rvalueReferenceToInt);
}
//struct S {
// int i;
//};
//auto && [f] = S{};
public void testForwardingReferenceWithRvalue() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f]", 1), rvalueReferenceToInt);
}
//struct S {
// int first;
// double second;
//};
//
//namespace std {
// template <typename>
// struct tuple_size;
//}
//auto [f, s] = S{};
public void testUnspecializedTupleSizeTemplate() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f,", 1), int_);
assertType(helper.assertNonProblem("s]", 1), double_);
}
//namespace std {
// using size_t = unsigned long long;
//}
//
//struct S {
// int first() const {
// return 1;
// }
// double second() const {
// return 2.0;
// }
// template <std::size_t V>
// auto get() {
// if constexpr (V == 0) {
// return first();
// } else if (V == 1) {
// return second();
// }
// static_assert(V < 2);
// }
//};
//
//namespace std {
// template <typename>
// struct tuple_size;
// template <>
// struct tuple_size<S> {
// constexpr static size_t value = 2;
// };
// template <std::size_t, typename>
// struct tuple_element;
// template <>
// struct tuple_element<0, S> {
// using type = int;
// };
// template <>
// struct tuple_element<1, S> {
// using type = double;
// };
//}
//auto [f, s] = S{};
public void testFromTupleLikeDecompositionWithMemberGet() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f,", 1), int_);
assertType(helper.assertNonProblem("s]", 1), double_);
}
//namespace std {
// using size_t = unsigned long long;
//}
//
//struct S {
// int first() const {
// return 1;
// }
// double second() const {
// return 2.0;
// }
//};
//template <std::size_t V>
//auto get(S s) {
// if constexpr (V == 0) {
// return s.first();
// } else if (V == 1) {
// return s.second();
// }
// static_assert(V < 2);
//}
//
//namespace std {
// template <typename>
// struct tuple_size;
// template <>
// struct tuple_size<S> {
// constexpr static size_t value = 2;
// };
// template <std::size_t, typename>
// struct tuple_element;
// template <>
// struct tuple_element<0, S> {
// using type = int;
// };
// template <>
// struct tuple_element<1, S> {
// using type = double;
// };
//}
//auto [f, s] = S{};
public void testFromTupleLikeDecompositionWithInheritedTupleElementType() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("f,", 1), int_);
assertType(helper.assertNonProblem("s]", 1), double_);
}
//struct S {
// int member;
//} s{1};
//auto [valueLarg] = s;
//auto [valueRarg] = S{1};
//auto const [valueConstLarg] = s;
//auto const [valueConstRarg] = S{1};
//auto & [lrefLarg] = s;
//auto & [lrefRarg] = S{1};
//auto const & [lrefConstLarg] = s;
//auto const & [lrefConstRarg] = S{1};
//auto && [frefLarg] = s;
//auto && [frefRarg] = S{1};
//auto const && [rrefConstLarg] = s;
//auto const && [rrefConstRarg] = S{1};
//auto const sConst = s;
//auto & [lrefLConstarg] = sConst;
//auto && [frefLConstarg] = sConst;
//S volatile sVolatile{1};
//auto & [lrefLVolatilearg] = sVolatile;
//auto && [frefLVolatilearg] = sVolatile;
public void testResultingTypes() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("valueLarg"), int_);
assertType(helper.assertNonProblem("valueRarg"), int_);
assertType(helper.assertNonProblem("valueConstLarg"), constInt);
assertType(helper.assertNonProblem("valueConstRarg"), constInt);
assertType(helper.assertNonProblem("lrefLarg"), referenceToInt);
assertType(helper.assertNonProblem("lrefRarg"), referenceToInt);
assertType(helper.assertNonProblem("lrefConstLarg"), referenceToConstInt);
assertType(helper.assertNonProblem("lrefConstRarg"), referenceToConstInt);
assertType(helper.assertNonProblem("frefLarg"), referenceToInt);
assertType(helper.assertNonProblem("frefRarg"), rvalueReferenceToInt);
assertType(helper.assertNonProblem("rrefConstLarg"), rvalueReferenceTo(constInt));
assertType(helper.assertNonProblem("rrefConstRarg"), rvalueReferenceTo(constInt));
assertType(helper.assertNonProblem("lrefLConstarg"), referenceToConstInt);
assertType(helper.assertNonProblem("frefLConstarg"), referenceToConstInt);
assertType(helper.assertNonProblem("lrefLVolatilearg"), referenceTo(volatileOf(int_)));
assertType(helper.assertNonProblem("frefLVolatilearg"), referenceTo(volatileOf(int_)));
}
//struct Aggregate {
// int i;
// double d;
// auto first() {
// auto [field1, _] = *this;
// return field1;
// }
// auto second() {
// auto [_, field2] = *this;
// return field2;
// }
//};
public void testThisDecomposition() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
assertType(helper.assertNonProblem("field1;", 6), int_);
assertType(helper.assertNonProblem("field2;", 6), double_);
}
//struct S {
// int first;
// double second;
//};
//constexpr S createS() {
// return S{1, 2.0};
//}
//auto [f, s] = createS();
public void testIVariablePropertiesOfImplicitNameForInitializer() throws Exception {
parseAndCheckBindings();
BindingAssertionHelper helper = getAssertionHelper();
ICPPClassType classS = helper.assertNonProblem("S", 1);
IASTImplicitName[] implicitNames = helper.getImplicitNames("= createS();", 11);
assertEquals(1, implicitNames.length);
IASTImplicitName implicitName = implicitNames[0];
IBinding binding = implicitName.getBinding();
CPPStructuredBindingComposite variable = assertInstance(binding, CPPStructuredBindingComposite.class);
assertType(variable, classS);
IValue initialValue = variable.getInitialValue();
CompositeValue compositeValue = assertInstance(initialValue, CompositeValue.class);
ICPPEvaluation[] subvalues = compositeValue.getAllSubValues();
assertEquals(2, subvalues.length);
assertEquals(IntegralValue.create(1), subvalues[0].getValue());
assertEquals(FloatingPointValue.create(2.0), subvalues[1].getValue());
}
//void f() {
// auto& [x] = x.y;
//}
public void testInvalidReferenceToIntroducedName() throws Exception {
BindingAssertionHelper ba = getAssertionHelper();
ba.assertProblem("x.y;", 1);
}
}