derek.holloway
7502bf64a4
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40 lines
2.0 KiB
C++
40 lines
2.0 KiB
C++
// RUN: %clang_cc1 -std=c++17 -verify %s
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template<typename T> int not_constexpr() { return T::error; }
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template<typename T> constexpr int is_constexpr() { return T::error; } // expected-error {{'::'}}
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template<typename T> int not_constexpr_var = T::error;
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template<typename T> constexpr int is_constexpr_var = T::error; // expected-error {{'::'}}
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template<typename T> const int is_const_var = T::error; // expected-error {{'::'}}
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template<typename T> const volatile int is_const_volatile_var = T::error;
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template<typename T> T is_dependent_var = T::error; // expected-error {{'::'}}
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template<typename T> int &is_reference_var = T::error; // expected-error {{'::'}}
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template<typename T> float is_float_var = T::error;
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void test() {
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// Do not instantiate functions referenced in unevaluated operands...
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(void)sizeof(not_constexpr<long>());
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(void)sizeof(is_constexpr<long>());
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(void)sizeof(not_constexpr_var<long>);
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(void)sizeof(is_constexpr_var<long>);
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(void)sizeof(is_const_var<long>);
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(void)sizeof(is_const_volatile_var<long>);
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(void)sizeof(is_dependent_var<long>);
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(void)sizeof(is_dependent_var<const long>);
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(void)sizeof(is_reference_var<long>);
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(void)sizeof(is_float_var<long>);
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// ... but do if they are potentially constant evaluated, and refer to
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// constexpr functions or to variables usable in constant expressions.
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(void)sizeof(int{not_constexpr<int>()});
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(void)sizeof(int{is_constexpr<int>()}); // expected-note {{instantiation of}}
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(void)sizeof(int{not_constexpr_var<int>});
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(void)sizeof(int{is_constexpr_var<int>}); // expected-note {{instantiation of}}
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(void)sizeof(int{is_const_var<int>}); // expected-note {{instantiation of}}
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(void)sizeof(int{is_const_volatile_var<int>});
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(void)sizeof(int{is_dependent_var<int>});
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(void)sizeof(int{is_dependent_var<const int>}); // expected-note {{instantiation of}}
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(void)sizeof(int{is_reference_var<int>}); // expected-note {{instantiation of}}
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(void)sizeof(int{is_float_var<int>}); // expected-error {{cannot be narrowed}} expected-note {{cast}}
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}
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