fdefe88bff
- Support non-member functions and callable objects for size and data(). We previously tried to (badly) pick the best overload ourselves, in a way that would only support member functions. We now leave clang construct an unresolved member expression and call that, properly performing overload resolution with callable objects and static functions, consistent with the logic for `get` calls for structured bindings. - Support UDLs as message expression. - Add tests and mark CWG2798 as resolved
344 lines
13 KiB
C++
344 lines
13 KiB
C++
// RUN: %clang_cc1 -std=c++2c -triple=x86_64-linux -fsyntax-only %s -verify
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static_assert(true, "");
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static_assert(true, 0); // expected-error {{the message in a static assertion must be a string literal or an object with 'data()' and 'size()' member functions}}
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struct Empty{};
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static_assert(true, Empty{}); // expected-error {{the message object in this static assertion is missing 'data()' and 'size()' member functions}}
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struct NoData {
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unsigned long size() const;
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};
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struct NoSize {
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const char* data() const;
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};
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static_assert(true, NoData{}); // expected-error {{the message object in this static assertion is missing a 'data()' member function}}
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static_assert(true, NoSize{}); // expected-error {{the message object in this static assertion is missing a 'size()' member function}}
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struct InvalidSize {
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const char* size() const;
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const char* data() const;
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};
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static_assert(true, InvalidSize{}); // expected-error {{the message in a static assertion must have a 'size()' member function returning an object convertible to 'std::size_t'}} \
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// expected-error {{value of type 'const char *' is not implicitly convertible to 'unsigned long'}}
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struct InvalidData {
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unsigned long size() const;
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unsigned long data() const;
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};
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static_assert(true, InvalidData{}); // expected-error {{the message in a static assertion must have a 'data()' member function returning an object convertible to 'const char *'}} \
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// expected-error {{value of type 'unsigned long' is not implicitly convertible to 'const char *'}}
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struct NonConstexprSize {
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unsigned long size() const; // expected-note 2{{declared here}}
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constexpr const char* data() const;
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};
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static_assert(true, NonConstexprSize{}); // expected-error {{the message in this static assertion is not a constant expression}} \
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// expected-note {{non-constexpr function 'size' cannot be used in a constant expression}}
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static_assert(false, NonConstexprSize{}); // expected-error {{the message in a static assertion must be produced by a constant expression}} \
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// expected-error {{static assertion failed}} \
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// expected-note {{non-constexpr function 'size' cannot be used in a constant expression}}
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struct NonConstexprData {
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constexpr unsigned long size() const {
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return 32;
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}
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const char* data() const; // expected-note 2{{declared here}}
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};
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static_assert(true, NonConstexprData{}); // expected-error {{the message in this static assertion is not a constant expression}} \
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// expected-note {{non-constexpr function 'data' cannot be used in a constant expression}}
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static_assert(false, NonConstexprData{}); // expected-error {{the message in a static assertion must be produced by a constant expression}} \
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// expected-error {{static assertion failed}} \
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// expected-note {{non-constexpr function 'data' cannot be used in a constant expression}}
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struct string_view {
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int S;
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const char* D;
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constexpr string_view(const char* Str) : S(__builtin_strlen(Str)), D(Str) {}
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constexpr string_view(int Size, const char* Str) : S(Size), D(Str) {}
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constexpr int size() const {
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return S;
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}
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constexpr const char* data() const {
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return D;
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}
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};
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constexpr string_view operator+(auto, string_view S) {
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return S;
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}
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constexpr const char g_[] = "long string";
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template <typename T, int S>
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struct array {
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constexpr unsigned long size() const {
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return S;
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}
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constexpr const char* data() const {
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return d_;
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}
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const char d_[S];
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};
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static_assert(false, string_view("test")); // expected-error {{static assertion failed: test}}
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static_assert(false, "Literal" + string_view("test")); // expected-error {{static assertion failed: test}}
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static_assert(false, L"Wide Literal" + string_view("test")); // expected-error {{static assertion failed: test}}
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static_assert(false, "Wild" "Literal" "Concatenation" + string_view("test")); // expected-error {{static assertion failed: test}}
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static_assert(false, "Wild" "Literal" L"Concatenation" + string_view("test")); // expected-error {{static assertion failed: test}}
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static_assert(false, "Wild" u"Literal" L"Concatenation" + string_view("test")); // expected-error {{unsupported non-standard concatenation of string literals}}
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static_assert(false, string_view("😀")); // expected-error {{static assertion failed: 😀}}
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static_assert(false, string_view(0, nullptr)); // expected-error {{static assertion failed:}}
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static_assert(false, string_view(1, "ABC")); // expected-error {{static assertion failed: A}}
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static_assert(false, string_view(42, "ABC")); // expected-error {{static assertion failed: ABC}} \
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// expected-error {{the message in a static assertion must be produced by a constant expression}} \
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// expected-note {{read of dereferenced one-past-the-end pointer is not allowed in a constant expression}}
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static_assert(false, array<char, 2>{'a', 'b'}); // expected-error {{static assertion failed: ab}}
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struct ConvertibleToInt {
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constexpr operator int() {
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return 4;
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}
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};
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struct ConvertibleToCharPtr {
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constexpr operator const char*() {
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return "test";
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}
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};
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struct MessageFromConvertible {
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constexpr ConvertibleToInt size() const {
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return {};
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}
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constexpr ConvertibleToCharPtr data() const {
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return {};
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}
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};
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static_assert(true, MessageFromConvertible{});
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static_assert(false, MessageFromConvertible{}); // expected-error{{static assertion failed: test}}
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struct Leaks {
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constexpr unsigned long size() const {
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return 2;
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}
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constexpr const char* data() const {
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return new char[2]{'u', 'b'}; // expected-note {{allocation performed here was not deallocated}}
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}
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};
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static_assert(false, Leaks{}); //expected-error {{the message in a static assertion must be produced by a constant expression}} \
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// expected-error {{static assertion failed: ub}}
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struct RAII {
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const char* d = new char[2]{'o', 'k'};
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constexpr unsigned long size() const {
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return 2;
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}
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constexpr const char* data() const {
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return d;
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}
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constexpr ~RAII() {
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delete[] d;
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}
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};
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static_assert(false, RAII{}); // expected-error {{static assertion failed: ok}}
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namespace MoreTemporary {
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struct Data{
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constexpr operator const char*() const {
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return d;
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}
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char d[6] = { "Hello" };
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};
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struct Size {
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constexpr operator int() const {
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return 5;
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}
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};
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struct Message {
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constexpr auto size() const {
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return Size{};
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}
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constexpr auto data() const {
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return Data{};
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}
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};
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static_assert(false, Message{}); // expected-error {{static assertion failed: Hello}}
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}
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struct MessageInvalidSize {
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constexpr unsigned long size(int) const; // expected-note {{'size' declared here}}
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constexpr const char* data() const;
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};
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struct MessageInvalidData {
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constexpr unsigned long size() const;
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constexpr const char* data(int) const; // expected-note {{'data' declared here}}
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};
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static_assert(false, MessageInvalidSize{}); // expected-error {{static assertion failed}} \
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// expected-error {{the message in a static assertion must have a 'size()' member function returning an object convertible to 'std::size_t'}} \
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// expected-error {{too few arguments to function call, expected 1, have 0}}
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static_assert(false, MessageInvalidData{}); // expected-error {{static assertion failed}} \
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// expected-error {{the message in a static assertion must have a 'data()' member function returning an object convertible to 'const char *'}} \
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// expected-error {{too few arguments to function call, expected 1, have 0}}
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struct NonConstMembers {
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constexpr int size() {
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return 1;
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}
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constexpr const char* data() {
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return "A";
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}
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};
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static_assert(false, NonConstMembers{}); // expected-error {{static assertion failed: A}}
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struct DefaultArgs {
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constexpr int size(int i = 0) {
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return 2;
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}
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constexpr const char* data(int i =0, int j = 42) {
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return "OK";
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}
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};
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static_assert(false, DefaultArgs{}); // expected-error {{static assertion failed: OK}}
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struct Variadic {
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constexpr int size(auto...) {
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return 2;
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}
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constexpr const char* data(auto...) {
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return "OK";
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}
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};
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static_assert(false, Variadic{}); // expected-error {{static assertion failed: OK}}
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template <typename T>
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struct DeleteAndRequires {
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constexpr int size() = delete; // expected-note {{'size' has been explicitly marked deleted here}}
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constexpr const char* data() requires false; // expected-note {{because 'false' evaluated to false}}
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};
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static_assert(false, DeleteAndRequires<void>{});
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// expected-error@-1 {{static assertion failed}} \
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// expected-error@-1 {{the message in a static assertion must have a 'size()' member function returning an object convertible to 'std::size_t'}}\
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// expected-error@-1 {{invalid reference to function 'data': constraints not satisfied}} \
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// expected-error@-1 {{attempt to use a deleted function}}
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class Private {
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constexpr int size(int i = 0) { // expected-note {{implicitly declared private here}}
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return 2;
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}
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constexpr const char* data(int i =0, int j = 42) { // expected-note {{implicitly declared private here}}
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return "OK";
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}
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};
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static_assert(false, Private{}); // expected-error {{'data' is a private member of 'Private'}}\
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// expected-error {{'size' is a private member of 'Private'}}\
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// expected-error {{static assertion failed: OK}}
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struct MessageOverload {
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constexpr int size() {
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return 1;
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}
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constexpr int size() const;
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constexpr const char* data() {
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return "A";
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}
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constexpr const char* data() const;
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};
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static_assert(false, MessageOverload{}); // expected-error {{static assertion failed: A}}
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struct InvalidPtr {
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consteval auto size() {
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return 42;
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}
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consteval const char *data() {
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const char *ptr; // Garbage
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return ptr; // expected-note {{read of uninitialized object is not allowed in a constant expression}}
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}
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};
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static_assert(false, InvalidPtr{}); // expected-error{{the message in a static assertion must be produced by a constant expression}} \
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//expected-error {{static assertion failed}} \
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// expected-note {{in call to 'InvalidPtr{}.data()'}}
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namespace DependentMessage {
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template <typename Ty>
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struct Good {
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static_assert(false, Ty{}); // expected-error {{static assertion failed: hello}}
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};
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template <typename Ty>
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struct Bad {
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static_assert(false, Ty{}); // expected-error {{the message in a static assertion must be a string literal or an object with 'data()' and 'size()' member functions}} \
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// expected-error {{static assertion failed}}
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};
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struct Frobble {
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constexpr int size() const { return 5; }
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constexpr const char *data() const { return "hello"; }
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};
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constexpr Frobble operator ""_myd (const char *, unsigned long) { return Frobble{}; }
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static_assert (false, "foo"_myd); // expected-error {{static assertion failed: hello}}
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Good<Frobble> a; // expected-note {{in instantiation}}
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Bad<int> b; // expected-note {{in instantiation}}
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}
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namespace EscapeInDiagnostic {
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static_assert('\u{9}' == (char)1, ""); // expected-error {{failed}} \
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// expected-note {{evaluates to ''\t' (0x09, 9) == '<U+0001>' (0x01, 1)'}}
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static_assert((char8_t)-128 == (char8_t)-123, ""); // expected-error {{failed}} \
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// expected-note {{evaluates to 'u8'<80>' (0x80, 128) == u8'<85>' (0x85, 133)'}}
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static_assert((char16_t)0xFEFF == (char16_t)0xDB93, ""); // expected-error {{failed}} \
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// expected-note {{evaluates to 'u'' (0xFEFF, 65279) == u'\xDB93' (0xDB93, 56211)'}}
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}
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struct Static {
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static constexpr int size() { return 5; }
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static constexpr const char *data() { return "hello"; }
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};
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static_assert(false, Static{}); // expected-error {{static assertion failed: hello}}
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struct Data {
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unsigned long size = 0;
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const char* data = "hello";
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};
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static_assert(false, Data{}); // expected-error {{called object type 'unsigned long' is not a function or function pointer}} \
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// expected-error {{called object type 'const char *' is not a function or function pointer}} \
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// expected-error {{the message in a static assertion must have a 'size()' member function returning an object convertible to 'std::size_t'}} \
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// expected-error {{static assertion failed}}
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struct Callable {
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struct {
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constexpr auto operator()() const {
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return 5;
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};
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} size;
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struct {
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constexpr auto operator()() const {
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return "hello";
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};
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} data;
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};
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static_assert(false, Callable{}); // expected-error {{static assertion failed: hello}}
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