1da13237a4
Summary: I agree with https://easyaspi314.github.io/gcc-vs-clang.html?fbclid=IwAR1VA0qxiWVUusOQUv5z7JESS7ZpeJy-UqAI5mnJscofGLqXcqeErIUB2gU, current warning message is not very good. We should try to improve it.. Reviewers: rsmith, aaron.ballman, easyaspi314 Reviewed By: aaron.ballman Subscribers: arphaman, Quuxplusone, mehdi_amini, hiraditya, cfe-commits, llvm-commits Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D69762
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
// RUN: %clang_cc1 -std=c++11 %s -Winvalid-noreturn -verify
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// An attribute-specifier-seq in a lambda-declarator appertains to the
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// type of the corresponding function call operator.
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void test_attributes() {
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auto nrl = [](int x) -> int { if (x > 0) return x; }; // expected-warning{{on-void lambda does not return a value in all control paths}}
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// FIXME: GCC accepts the [[gnu::noreturn]] attribute here.
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auto nrl2 = []() [[gnu::noreturn]] { return; }; // expected-warning{{attribute 'noreturn' ignored}}
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}
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template<typename T>
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struct bogus_override_if_virtual : public T {
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bogus_override_if_virtual() : T(*(T*)0) { } // expected-warning {{binding dereferenced null pointer to reference has undefined behavior}}
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int operator()() const;
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};
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void test_quals() {
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// This function call operator is declared const (9.3.1) if and only
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// if the lambda- expression's parameter-declaration-clause is not
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// followed by mutable.
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auto l = [=](){}; // expected-note{{method is not marked volatile}}
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const decltype(l) lc = l;
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l();
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lc();
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auto ml = [=]() mutable{}; // expected-note{{method is not marked const}} \
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// expected-note{{method is not marked volatile}}
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const decltype(ml) mlc = ml;
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ml();
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mlc(); // expected-error{{no matching function for call to object of type}}
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// It is neither virtual nor declared volatile.
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volatile decltype(l) lv = l;
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volatile decltype(ml) mlv = ml;
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lv(); // expected-error{{no matching function for call to object of type}}
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mlv(); // expected-error{{no matching function for call to object of type}}
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bogus_override_if_virtual<decltype(l)> bogus; // expected-note{{in instantiation of member function 'bogus_override_if_virtual<(lambda}}
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}
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// Core issue 974: default arguments (8.3.6) may be specified in the
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// parameter-declaration-clause of a lambda-declarator.
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int test_default_args() {
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return [](int i = 5, int j = 17) { return i+j;}(5, 6);
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}
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// Any exception-specification specified on a lambda-expression
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// applies to the corresponding function call operator.
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void test_exception_spec() {
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auto tl1 = []() throw(int) {};
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auto tl2 = []() {};
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static_assert(!noexcept(tl1()), "lambda can throw");
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static_assert(!noexcept(tl2()), "lambda can throw");
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auto ntl1 = []() throw() {};
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auto ntl2 = []() noexcept(true) {};
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auto ntl3 = []() noexcept {};
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static_assert(noexcept(ntl1()), "lambda cannot throw");
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static_assert(noexcept(ntl2()), "lambda cannot throw");
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static_assert(noexcept(ntl3()), "lambda cannot throw");
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}
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