345 lines
10 KiB
C++
345 lines
10 KiB
C++
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// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
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// RUN: %clang_cc1 -std=c++14 -fsyntax-only -verify %s
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// RUN: %clang_cc1 -std=c++17 -fsyntax-only -verify %s
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struct pr12960 {
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int begin;
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void foo(int x) {
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for (int& it : x) { // expected-error {{invalid range expression of type 'int'; no viable 'begin' function available}}
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}
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}
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};
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struct null_t {
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operator int*();
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};
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namespace X {
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template<typename T>
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auto begin(T &&t) -> decltype(t.begin()) { return t.begin(); } // expected-note 2{{ignored: substitution failure}}
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template<typename T>
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auto end(T &&t) -> decltype(t.end()) { return t.end(); } // expected-note {{candidate template ignored: substitution failure [with T = }}
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template<typename T>
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auto begin(T &&t) -> decltype(t.alt_begin()) { return t.alt_begin(); } // expected-note {{selected 'begin' template [with T = }} \
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// expected-note 2{{candidate template ignored: substitution failure [with T = }}
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template<typename T>
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auto end(T &&t) -> decltype(t.alt_end()) { return t.alt_end(); } // expected-note {{candidate template ignored: substitution failure [with T = }}
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namespace inner {
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// These should never be considered.
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int begin(int);
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int end(int);
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}
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using namespace inner;
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struct A { // expected-note 2 {{candidate constructor}}
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A();
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int *begin(); // expected-note 3{{selected 'begin' function with iterator type 'int *'}} expected-note {{'begin' declared here}}
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int *end();
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};
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struct B {
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B();
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int *alt_begin();
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int *alt_end();
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};
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struct NoBeginADL {
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null_t alt_end();
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};
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struct NoEndADL {
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null_t alt_begin();
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};
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struct C {
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C();
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struct It {
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int val;
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operator int &() { return val; }
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};
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It begin();
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It end();
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};
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constexpr int operator*(const C::It &) { return 0; }
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struct D {
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D();
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using Ty = int[2];
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Ty *begin();
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Ty *end();
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};
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void test_D() {
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#if __cplusplus >= 201703L
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for (extern auto [x, y] : D()) {
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} // expected-error@-1 {{decomposition declaration cannot be declared 'extern'}}
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// expected-error@-2 {{loop variable '[x, y]' may not be declared 'extern'}}
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#endif
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}
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}
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using X::A;
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void f();
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void f(int);
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void g() {
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for (int a : A())
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A __begin;
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for (char *a : A()) { // expected-error {{cannot initialize a variable of type 'char *' with an lvalue of type 'int'}}
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}
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for (char *a : X::B()) { // expected-error {{cannot initialize a variable of type 'char *' with an lvalue of type 'int'}}
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}
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// FIXME: Terrible diagnostic here. auto deduction should fail, but does not!
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for (double a : f) { // expected-error {{cannot use type '<overloaded function type>' as a range}}
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}
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for (auto a : A()) {
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}
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for (auto a : X::B()) {
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}
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for (auto *a : A()) { // expected-error {{variable 'a' with type 'auto *' has incompatible initializer of type 'int'}}
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}
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// : is not a typo for :: here.
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for (A NS:A()) { // expected-error {{no viable conversion from 'int' to 'X::A'}}
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}
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for (auto not_in_scope : not_in_scope) { // expected-error {{use of undeclared identifier 'not_in_scope'}}
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}
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for (auto a : A())
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for (auto b : A()) {
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__range.begin(); // expected-error {{use of undeclared identifier '__range'}}
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++__begin; // expected-error {{use of undeclared identifier '__begin'}}
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--__end; // expected-error {{use of undeclared identifier '__end'}}
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}
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for (char c : "test")
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;
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for (auto a : f()) // expected-error {{cannot use type 'void' as a range}}
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;
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extern int incomplete[];
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for (auto a : incomplete) // expected-error {{cannot use incomplete type 'int []' as a range}}
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;
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extern struct Incomplete also_incomplete[2]; // expected-note 2{{forward declaration}}
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for (auto &a : also_incomplete) // expected-error {{cannot use incomplete type 'struct Incomplete [2]' as a range}}
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;
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struct VoidBegin {
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void begin(); // expected-note {{selected 'begin' function with iterator type 'void'}}
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void end();
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};
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for (auto a : VoidBegin()) // expected-error {{cannot use type 'void' as an iterator}}
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;
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struct Differ {
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int *begin();
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null_t end();
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};
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for (auto a : Differ())
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#if __cplusplus <= 201402L
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// expected-warning@-2 {{'begin' and 'end' returning different types ('int *' and 'null_t') is a C++17 extension}}
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// expected-note@-6 {{selected 'begin' function with iterator type 'int *'}}
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// expected-note@-6 {{selected 'end' function with iterator type 'null_t'}}
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#endif
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;
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for (void f() : "error") // expected-error {{for range declaration must declare a variable}}
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;
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for (extern int a : A()) {} // expected-error {{loop variable 'a' may not be declared 'extern'}}
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for (static int a : A()) {} // expected-error {{loop variable 'a' may not be declared 'static'}}
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for (thread_local int a : A()) {} // expected-error {{loop variable 'a' may not be declared 'thread_local'}}
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for (register int a : A()) {} // expected-error {{loop variable 'a' may not be declared 'register'}} expected-warning 0-1{{register}} expected-error 0-1{{register}}
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for (constexpr int a : X::C()) {} // OK per CWG issue #1204.
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for (auto u : X::NoBeginADL()) { // expected-error {{invalid range expression of type 'X::NoBeginADL'; no viable 'begin' function available}}
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}
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for (auto u : X::NoEndADL()) { // expected-error {{invalid range expression of type 'X::NoEndADL'; no viable 'end' function available}}
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}
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struct NoBegin {
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null_t end();
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};
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struct NoEnd {
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null_t begin();
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};
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for (auto u : NoBegin()) { // expected-error {{no viable 'begin' function available}}
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}
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for (auto u : NoEnd()) { // expected-error {{no viable 'end' function available}}
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}
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struct NoIncr {
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void *begin(); // expected-note {{selected 'begin' function with iterator type 'void *'}}
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void *end();
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};
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for (auto u : NoIncr()) { // expected-error {{arithmetic on a pointer to void}}\
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expected-note {{in implicit call to 'operator++' for iterator of type 'NoIncr'}}
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}
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struct NoNotEq {
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NoNotEq begin(); // expected-note {{selected 'begin' function with iterator type 'NoNotEq'}}
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NoNotEq end();
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void operator++();
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};
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for (auto u : NoNotEq()) { // expected-error {{invalid operands to binary expression}}\
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expected-note {{in implicit call to 'operator!=' for iterator of type 'NoNotEq'}}
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}
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struct NoDeref {
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NoDeref begin(); // expected-note {{selected 'begin' function}}
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NoDeref end();
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void operator++();
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bool operator!=(NoDeref &);
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};
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for (auto u : NoDeref()) { // expected-error {{indirection requires pointer operand}} \
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expected-note {{in implicit call to 'operator*' for iterator of type 'NoDeref'}}
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}
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struct NoCopy {
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NoCopy();
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NoCopy(const NoCopy &) = delete;
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int *begin();
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int *end();
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};
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for (int n : NoCopy()) { // ok
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}
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for (int n : 42) { // expected-error {{invalid range expression of type 'int'; no viable 'begin' function available}}
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}
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for (auto a : *also_incomplete) { // expected-error {{cannot use incomplete type 'struct Incomplete' as a range}}
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}
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}
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template<typename T, typename U>
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void h(T t) {
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for (U u : t) { // expected-error {{no viable conversion from 'X::A' to 'int'}}
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}
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for (auto u : t) {
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}
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}
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template void h<A, int>(A);
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template void h<A(&)[4], A &>(A(&)[4]);
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template void h<A(&)[13], A>(A(&)[13]);
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template void h<A(&)[13], int>(A(&)[13]); // expected-note {{requested here}}
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template<typename T>
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void i(T t) {
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for (auto u : t) { // expected-error {{invalid range expression of type 'X::A *'; no viable 'begin' function available}} \
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expected-error {{'this' argument to member function 'begin' has type 'const X::A', but function is not marked const}} \
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expected-note {{when looking up 'begin' function}}
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}
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}
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template void i<A[13]>(A*); // expected-note {{requested here}}
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template void i<const A>(const A); // expected-note {{requested here}}
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struct StdBeginEnd {};
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namespace std {
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int *begin(StdBeginEnd);
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int *end(StdBeginEnd);
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}
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void DR1442() {
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for (auto a : StdBeginEnd()) {} // expected-error {{invalid range expression of type 'StdBeginEnd'; no viable 'begin'}}
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}
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namespace NS {
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class ADL {};
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int *begin(ADL); // expected-note {{no known conversion from 'NS::NoADL' to 'NS::ADL'}}
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int *end(ADL);
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class NoADL {};
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}
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int *begin(NS::NoADL);
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int *end(NS::NoADL);
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struct VoidBeginADL {};
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void begin(VoidBeginADL); // expected-note {{selected 'begin' function with iterator type 'void'}}
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void end(VoidBeginADL);
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void j() {
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for (auto u : NS::ADL()) {
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}
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for (auto u : NS::NoADL()) { // expected-error {{invalid range expression of type 'NS::NoADL'; no viable 'begin' function available}}
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}
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for (auto a : VoidBeginADL()) { // expected-error {{cannot use type 'void' as an iterator}}
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}
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}
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void example() {
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int array[5] = { 1, 2, 3, 4, 5 };
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for (int &x : array)
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x *= 2;
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}
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namespace rdar13712739 {
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template<typename T>
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void foo(const T& t) {
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auto &x = t.get(); // expected-error{{member reference base type 'const int' is not a structure or union}}
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for (auto &blah : x) { }
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}
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template void foo(const int&); // expected-note{{in instantiation of function template specialization}}
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}
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namespace p0962r1 {
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namespace NA {
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struct A {
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void begin();
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};
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int *begin(A);
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int *end(A);
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}
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namespace NB {
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struct B {
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void end();
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};
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int *begin(B);
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int *end(B);
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}
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namespace NC {
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struct C {
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void begin();
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};
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int *begin(C);
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}
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namespace ND {
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struct D {
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void end();
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};
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int *end(D);
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}
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namespace NE {
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struct E {
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void begin(); // expected-note {{member is not a candidate because range type 'p0962r1::NE::E' has no 'end' member}}
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};
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int *end(E);
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}
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namespace NF {
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struct F {
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void end(); // expected-note {{member is not a candidate because range type 'p0962r1::NF::F' has no 'begin' member}}
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};
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int *begin(F);
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}
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void use(NA::A a, NB::B b, NC::C c, ND::D d, NE::E e, NF::F f) {
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for (auto x : a) {}
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for (auto x : b) {}
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for (auto x : c) {} // expected-error {{no viable 'end' function}}
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for (auto x : d) {} // expected-error {{no viable 'begin' function}}
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for (auto x : e) {} // expected-error {{no viable 'begin' function}}
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for (auto x : f) {} // expected-error {{no viable 'end' function}}
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}
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}
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