55 lines
2.1 KiB
C++
55 lines
2.1 KiB
C++
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// RUN: %clang_cc1 -std=c++2a -verify %s
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constexpr int non_class = 42;
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constexpr int arr_non_class[5] = {1, 2, 3};
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struct A {
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int member = 1;
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constexpr ~A() { member = member + 1; }
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};
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constexpr A class_ = {};
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constexpr A arr_class[5] = {{}, {}};
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struct Mutable {
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mutable int member = 1; // expected-note {{declared here}}
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constexpr ~Mutable() { member = member + 1; } // expected-note {{read of mutable member}}
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};
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constexpr Mutable mut_member; // expected-error {{must have constant destruction}} expected-note {{in call}}
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struct MutableStore {
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mutable int member = 1; // expected-note {{declared here}}
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constexpr ~MutableStore() { member = 2; } // expected-note {{assignment to mutable member}}
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};
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constexpr MutableStore mut_store; // expected-error {{must have constant destruction}} expected-note {{in call}}
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// Note: the constant destruction rules disallow this example even though hcm.n is a const object.
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struct MutableConst {
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struct HasConstMember {
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const int n = 4;
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};
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mutable HasConstMember hcm; // expected-note {{here}}
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constexpr ~MutableConst() {
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int q = hcm.n; // expected-note {{read of mutable}}
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}
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};
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constexpr MutableConst mc; // expected-error {{must have constant destruction}} expected-note {{in call}}
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struct Temporary {
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int &&temp;
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constexpr ~Temporary() {
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int n = temp; // expected-note {{outside the expression that created the temporary}}
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}
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};
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constexpr Temporary t = {3}; // expected-error {{must have constant destruction}} expected-note {{created here}} expected-note {{in call}}
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namespace P1073R3 {
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consteval int f() { return 42; } // expected-note 2 {{declared here}}
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consteval auto g() { return f; }
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consteval int h(int (*p)() = g()) { return p(); }
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constexpr int r = h();
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constexpr auto e = g(); // expected-error {{call to consteval function 'P1073R3::g' is not a constant expression}} \
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expected-error {{constexpr variable 'e' must be initialized by a constant expression}} \
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expected-note 2 {{pointer to a consteval declaration is not a constant expression}}
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static_assert(r == 42);
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} // namespace P1073R3
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