forked from OSchip/llvm-project
95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++0x %s
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typedef int&& irr;
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typedef irr& ilr_c1; // Collapses to int&
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typedef int& ilr;
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typedef ilr&& ilr_c2; // Collapses to int&
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irr ret_irr() {
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return 0; // expected-warning {{returning reference to local temporary}}
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}
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struct not_int {};
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int over(int&);
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not_int over(int&&);
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int over2(const int&);
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not_int over2(int&&);
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struct conv_to_not_int_rvalue {
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operator not_int &&();
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};
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typedef void (fun_type)();
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void fun();
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fun_type &&make_fun();
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void f() {
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int &&virr1; // expected-error {{declaration of reference variable 'virr1' requires an initializer}}
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int &&virr2 = 0;
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int &&virr3 = virr2; // expected-error {{rvalue reference to type 'int' cannot bind to lvalue of type 'int'}}
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int i1 = 0;
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int &&virr4 = i1; // expected-error {{rvalue reference to type 'int' cannot bind to lvalue of type 'int'}}
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int &&virr5 = ret_irr();
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int &&virr6 = static_cast<int&&>(i1);
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(void)static_cast<not_int&&>(i1); // expected-error {{types are not compatible}}
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int i2 = over(i1);
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not_int ni1 = over(0);
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int i3 = over(virr2);
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not_int ni2 = over(ret_irr());
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int i4 = over2(i1);
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not_int ni3 = over2(0);
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ilr_c1 vilr1 = i1;
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ilr_c2 vilr2 = i1;
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conv_to_not_int_rvalue cnir;
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not_int &&ni4 = cnir;
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not_int &ni5 = cnir; // expected-error{{non-const lvalue reference to type 'not_int' cannot bind to a value of unrelated type 'conv_to_not_int_rvalue'}}
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not_int &&ni6 = conv_to_not_int_rvalue();
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fun_type &&fun_ref = fun; // works because functions are special
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fun_type &&fun_ref2 = make_fun(); // same
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fun_type &fun_lref = make_fun(); // also special
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try {
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} catch(int&&) { // expected-error {{cannot catch exceptions by rvalue reference}}
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}
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}
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int&& should_warn(int i) {
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// FIXME: The stack address return test doesn't reason about casts.
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return static_cast<int&&>(i); // xpected-warning {{returning reference to temporary}}
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}
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int&& should_not_warn(int&& i) { // But GCC 4.4 does
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return static_cast<int&&>(i);
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}
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// Test the return dance. This also tests IsReturnCopyElidable.
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struct MoveOnly {
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MoveOnly();
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MoveOnly(const MoveOnly&) = delete; // expected-note {{candidate constructor}} \
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// expected-note 3{{explicitly marked deleted here}}
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MoveOnly(MoveOnly&&); // expected-note {{candidate constructor}}
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MoveOnly(int&&); // expected-note {{candidate constructor}}
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};
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MoveOnly gmo;
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MoveOnly returningNonEligible() {
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int i;
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static MoveOnly mo;
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MoveOnly &r = mo;
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if (0) // Copy from global can't be elided
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return gmo; // expected-error {{call to deleted constructor}}
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else if (0) // Copy from local static can't be elided
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return mo; // expected-error {{call to deleted constructor}}
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else if (0) // Copy from reference can't be elided
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return r; // expected-error {{call to deleted constructor}}
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else // Construction from different type can't be elided
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return i; // expected-error {{no viable conversion from 'int' to 'MoveOnly'}}
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}
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