117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
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// RUN: %clang_cc1 -fsyntax-only -Wredundant-move -std=c++11 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -Wredundant-move -std=c++11 -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -ast-dump | FileCheck %s --check-prefix=CHECK-AST
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// definitions for std::move
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namespace std {
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inline namespace foo {
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template <class T> struct remove_reference { typedef T type; };
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template <class T> struct remove_reference<T&> { typedef T type; };
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template <class T> struct remove_reference<T&&> { typedef T type; };
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template <class T> typename remove_reference<T>::type &&move(T &&t);
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}
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}
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// test1 and test2 should not warn until after implementation of DR1579.
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struct A {};
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struct B : public A {};
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A test1(B b1) {
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B b2;
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return b1;
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return b2;
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return std::move(b1);
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return std::move(b2);
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}
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struct C {
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C() {}
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C(A) {}
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};
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C test2(A a1, B b1) {
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A a2;
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B b2;
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return a1;
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return a2;
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return b1;
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return b2;
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return std::move(a1);
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return std::move(a2);
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return std::move(b1);
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return std::move(b2);
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}
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// Copy of tests above with types changed to reference types.
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A test3(B& b1) {
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B& b2 = b1;
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return b1;
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return b2;
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return std::move(b1);
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return std::move(b2);
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}
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C test4(A& a1, B& b1) {
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A& a2 = a1;
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B& b2 = b1;
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return a1;
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return a2;
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return b1;
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return b2;
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return std::move(a1);
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return std::move(a2);
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return std::move(b1);
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return std::move(b2);
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}
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// PR23819, case 2
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struct D {};
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D test5(D d) {
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return d;
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// Verify the implicit move from the AST dump
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// CHECK-AST: ReturnStmt{{.*}}line:[[@LINE-2]]
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// CHECK-AST-NEXT: CXXConstructExpr{{.*}}D{{.*}}void (D &&)
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// CHECK-AST-NEXT: ImplicitCastExpr
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// CHECK-AST-NEXT: DeclRefExpr{{.*}}ParmVar{{.*}}'d'
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return std::move(d);
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// expected-warning@-1{{redundant move in return statement}}
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// expected-note@-2{{remove std::move call here}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:21-[[@LINE-4]]:22}:""
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}
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namespace templates {
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struct A {};
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struct B { B(A); };
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// Warn once here since the type is not dependent.
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template <typename T>
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A test1(A a) {
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return std::move(a);
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// expected-warning@-1{{redundant move in return statement}}
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// expected-note@-2{{remove std::move call here}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:22}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:23-[[@LINE-4]]:24}:""
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}
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void run_test1() {
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test1<A>(A());
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test1<B>(A());
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}
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// T1 and T2 may not be the same, the warning may not always apply.
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template <typename T1, typename T2>
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T1 test2(T2 t) {
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return std::move(t);
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}
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void run_test2() {
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test2<A, A>(A());
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test2<B, A>(A());
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}
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}
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