c38498f046
Previously we'd try to perform checks on the captures from the middle of parsing the lambda's body, at the point where we detected that a variable needed to be captured. This was wrong in a number of subtle ways. In PR23334, we couldn't correctly handle the list of potential odr-uses resulting from the capture, and our attempt to recover from that resulted in a use-after-free. We now defer building the initialization expression until we leave the lambda body and return to the enclosing context, where the initialization does the right thing. This patch only covers lambda-expressions, but we should apply the same change to blocks and captured statements too. llvm-svn: 235921
44 lines
1.7 KiB
C++
44 lines
1.7 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wno-unused-value %s -verify
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// prvalue
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void prvalue() {
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auto&& x = []()->void { };
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auto& y = []()->void { }; // expected-error{{cannot bind to a temporary of type}}
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}
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namespace std {
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class type_info;
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}
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struct P {
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virtual ~P();
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};
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void unevaluated_operand(P &p, int i) {
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int i2 = sizeof([] ()->int { return 0; }()); // expected-error{{lambda expression in an unevaluated operand}}
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const std::type_info &ti1 = typeid([&]() -> P& { return p; }());
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const std::type_info &ti2 = typeid([&]() -> int { return i; }()); // expected-error{{lambda expression in an unevaluated operand}}
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}
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template<typename T>
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struct Boom {
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Boom(const Boom&) {
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T* x = 1; // expected-error{{cannot initialize a variable of type 'int *' with an rvalue of type 'int'}} \
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// expected-error{{cannot initialize a variable of type 'double *' with an rvalue of type 'int'}}
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}
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void tickle() const;
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};
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void odr_used(P &p, Boom<int> boom_int, Boom<float> boom_float,
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Boom<double> boom_double) {
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const std::type_info &ti1
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= typeid([=,&p]() -> P& { boom_int.tickle(); return p; }()); // expected-note{{in instantiation of member function 'Boom<int>::Boom' requested here}}
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// This does not cause the instantiation of the Boom copy constructor,
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// because the copy-initialization of the capture of boom_float occurs in an
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// unevaluated operand.
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const std::type_info &ti2
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= typeid([=]() -> int { boom_float.tickle(); return 0; }()); // expected-error{{lambda expression in an unevaluated operand}}
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auto foo = [=]() -> int { boom_double.tickle(); return 0; }; // expected-note{{in instantiation of member function 'Boom<double>::Boom' requested here}}
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}
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