244 lines
7.3 KiB
C++
244 lines
7.3 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11
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namespace value_range_detail {
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template<typename T>
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class value_range_iter {
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T t;
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public:
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value_range_iter(const T &t) : t(t) {}
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T operator*() const { return t; }
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bool operator!=(const value_range_iter &o) const { return t != o.t; }
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value_range_iter &operator++() { ++t; return *this; }
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};
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template<typename T>
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struct value_range {
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value_range(const T &a, const T &b) : begin_(a), end_(b) {}
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value_range_iter<T> begin_, end_;
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};
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template<typename T>
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value_range_iter<T> begin(const value_range<T> &r) { return r.begin_; }
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template<typename T>
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value_range_iter<T> end(const value_range<T> &r) { return r.end_; }
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struct end_t {};
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template<typename T>
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class value_range_step_iter {
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T it, step;
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public:
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value_range_step_iter(const T &it, const T &step) : it(it), step(step) {}
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T operator*() const { return it; }
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bool operator!=(value_range_step_iter end) const { return it != end.it; }
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value_range_step_iter &operator++() { it += step; return *this; }
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};
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template<typename T>
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class value_range_step {
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T it, step, end_;
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public:
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value_range_step(const T &it, const T &end, const T &step) :
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it(it), end_(end), step(step) {}
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typedef value_range_step_iter<T> iterator;
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iterator begin() const { return iterator(it, step); }
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iterator end() const { return iterator(end_, step); }
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};
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}
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template<typename T>
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value_range_detail::value_range<T> range(const T &a, const T &b) { return value_range_detail::value_range<T>(a, b); }
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template<typename T>
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value_range_detail::value_range_step<T> range(const T &a, const T &b, const T &step) { return value_range_detail::value_range_step<T>(a, b, step); }
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namespace map_range {
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template<typename T>
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class vector {
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T storage[100];
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decltype(sizeof(char)) size;
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public:
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vector() : size() {}
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void push_back(T t) { storage[size++] = t; }
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T *begin() { return storage; }
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T *end() { return storage + size; }
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};
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template<typename T> struct tuple_elem {
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T t;
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tuple_elem() {}
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tuple_elem(T t) : t(t) {}
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};
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template<typename... A>
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struct tuple : tuple_elem<A>... {
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tuple() : tuple_elem<A>()... {}
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tuple(A... a) : tuple_elem<A>(a)... {}
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template<typename B> B &get() { return tuple_elem<B>::t; }
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};
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template<typename F, typename I>
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class map_iter {
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F f;
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I i;
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public:
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map_iter(F f, I i) : f(f), i(i) {}
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auto operator*() const -> decltype(f(*i)) { return f(*i); }
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bool operator!=(const map_iter &o) const { return i != o.i; }
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map_iter &operator++() { ++i; return *this; }
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};
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template<typename T>
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struct iter_pair {
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T begin_, end_;
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iter_pair(T begin, T end) : begin_(begin), end_(end) {}
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};
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template<typename T> T begin(iter_pair<T> p) { return p.begin_; }
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template<typename T> T end(iter_pair<T> p) { return p.end_; }
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template<typename...> class mem_fun_impl;
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template<typename R, typename T, typename... A>
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class mem_fun_impl<R (T::*)(A...)> {
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typedef R (T::*F)(A...);
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F f;
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public:
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mem_fun_impl(F f) : f(f) {}
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R operator()(T &t, A &&...a) const { return (t.*f)(static_cast<A&&>(a)...); }
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};
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template<typename F> mem_fun_impl<F> mem_fun(F f) { return mem_fun_impl<F>(f); }
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template<typename F, typename T>
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auto map(const F &f, T &t) -> iter_pair<map_iter<F, decltype(t.begin())>> {
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typedef map_iter<F, decltype(t.begin())> iter;
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return iter_pair<iter>(iter(f, t.begin()), iter(f, t.end()));
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}
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}
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#define assert(b) if (!(b)) { return 1; }
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int main() {
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int total = 0;
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for (auto n : range(1, 5)) {
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total += n;
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}
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assert(total == 10);
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for (auto n : range(10, 100, 10)) {
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total += n;
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}
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assert(total == 460);
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map_range::vector<char> chars;
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chars.push_back('a');
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chars.push_back('b');
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chars.push_back('c');
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for (char c : chars) {
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++total;
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}
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assert(total == 463);
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typedef map_range::tuple<int, double> T;
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map_range::vector<T> pairs;
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pairs.push_back(T(42, 12.9));
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pairs.push_back(T(6, 4.2));
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pairs.push_back(T(9, 1.1));
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for (auto a : map(map_range::mem_fun(&T::get<int>), pairs)) {
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total += a;
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}
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assert(total == 500);
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}
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// PR11793
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namespace test2 {
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class A {
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int xs[10]; // expected-note {{implicitly declared private here}}
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};
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void test(A &a) {
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for (int x : a.xs) { } // expected-error {{'xs' is a private member of 'test2::A'}}
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}
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}
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namespace test3 {
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// Make sure this doesn't crash
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struct A {};
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struct B { ~B(); operator bool(); };
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struct C { B operator!=(const C&); C& operator++(); int operator*(); };
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C begin(const A&);
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C end(const A&);
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template<typename T> void f() { for (auto a : A()) {} }
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void g() { f<int>(); }
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}
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namespace test4 {
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void f() {
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int y;
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// Make sure these don't crash. Better diagnostics would be nice.
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for (: {1, 2, 3}) {} // expected-error {{expected expression}} expected-error {{expected ';'}}
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for (1 : {1, 2, 3}) {} // expected-error {{must declare a variable}} expected-warning {{result unused}}
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for (+x : {1, 2, 3}) {} // expected-error {{undeclared identifier}} expected-error {{expected ';'}}
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for (+y : {1, 2, 3}) {} // expected-error {{must declare a variable}} expected-warning {{result unused}}
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}
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}
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namespace test5 {
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// Test error-recovery.
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void f() {
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for (auto x : undeclared_identifier) // expected-error {{undeclared identifier}}
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for (auto y : x->foo)
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y->bar();
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for (auto x : 123) // expected-error {{no viable 'begin'}}
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x->foo();
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}
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}
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namespace test6 {
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void foo(int arr[]) { // expected-note {{declared here}}
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for (auto i : arr) { }
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// expected-error@-1 {{cannot build range expression with array function parameter 'arr' since parameter with array type 'int []' is treated as pointer type 'int *'}}
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}
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struct vector {
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int *begin() { return 0; }
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int *end() { return 0; }
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};
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void foo(vector arr[]) { // expected-note {{declared here}}
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// Don't suggest to dereference arr.
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for (auto i : arr) { }
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// expected-error@-1 {{cannot build range expression with array function parameter 'arr' since parameter with array type 'test6::vector []' is treated as pointer type 'test6::vector *'}}
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}
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}
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namespace test7 {
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void f() {
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int arr[5], b;
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for (a : arr) {} // expected-error {{requires type for loop variable}}
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// FIXME: Give a different error in this case?
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for (b : arr) {} // expected-error {{requires type for loop variable}}
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for (arr : arr) {} // expected-error {{requires type for loop variable}}
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for (c alignas(8) : arr) { // expected-error {{requires type for loop variable}}
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static_assert(alignof(c) == 8, ""); // expected-warning {{extension}}
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}
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// FIXME: The fix-it hint here is not sufficient to fix the error.
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// We fail to diagnose that d is underaligned for its type, because
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// we check the alignment attribute before we perform the auto
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// deduction.
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for (d alignas(1) : arr) {} // expected-error {{requires type for loop variable}}
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for (e [[deprecated]] : arr) { e = 0; } // expected-warning{{use of the 'deprecated' attribute is a C++14 extension}} expected-warning {{deprecated}} expected-note {{here}} expected-error {{requires type for loop variable}}
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}
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}
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namespace pr18587 {
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class Arg {};
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struct Cont {
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int *begin();
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int *end();
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};
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void AddAllArgs(Cont &x) {
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for (auto Arg: x) {
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}
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}
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}
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