88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
// RUN: %clang_cc1 -std=c++1z %s -verify
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namespace std {
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template<typename> struct tuple_size;
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template<int, typename> struct tuple_element;
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}
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struct Get {
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template<int> int get() { return 0; }
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operator bool() { return true; }
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};
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namespace std {
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template<> struct tuple_size<Get> { static constexpr int value = 1; };
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template<> struct tuple_element<0, Get> { using type = int; };
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}
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struct Na {
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bool flag;
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float data;
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};
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struct Rst {
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bool flag;
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float data;
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explicit operator bool() const {
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return flag;
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}
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};
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Rst f();
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Na g();
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namespace CondInIf {
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int h() {
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if (auto [ok, d] = f()) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}}
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;
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if (auto [ok, d] = g()) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}} expected-error {{value of type 'Na' is not contextually convertible to 'bool'}}
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;
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if (auto [value] = Get()) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}}
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return value;
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}
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} // namespace CondInIf
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namespace CondInWhile {
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int h() {
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while (auto [ok, d] = f()) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}}
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;
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while (auto [ok, d] = g()) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}} expected-error {{value of type 'Na' is not contextually convertible to 'bool'}}
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;
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while (auto [value] = Get()) // expected-warning{{ISO C++17 does not permit structured binding declaration in a condition}}
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return value;
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}
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} // namespace CondInWhile
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namespace CondInFor {
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int h() {
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for (; auto [ok, d] = f();) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}}
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;
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for (; auto [ok, d] = g();) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}} expected-error {{value of type 'Na' is not contextually convertible to 'bool'}}
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;
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for (; auto [value] = Get();) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}}
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return value;
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}
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} // namespace CondInFor
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struct IntegerLike {
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bool flag;
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float data;
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operator int() const {
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return int(data);
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}
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};
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namespace CondInSwitch {
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int h(IntegerLike x) {
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switch (auto [ok, d] = x) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}}
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;
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switch (auto [ok, d] = g()) // expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}} expected-error {{statement requires expression of integer type ('Na' invalid)}}
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;
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switch (auto [value] = Get()) {// expected-warning {{ISO C++17 does not permit structured binding declaration in a condition}}
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// expected-warning@-1{{switch condition has boolean value}}
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case 1:
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return value;
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}
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}
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} // namespace CondInSwitch
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