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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: gcc-10
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// std::ranges::begin
#include <ranges>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
using RangeBeginT = decltype(std::ranges::begin)&;
using RangeCBeginT = decltype(std::ranges::cbegin)&;
static int globalBuff[8];
struct Incomplete;
static_assert(!std::is_invocable_v<RangeBeginT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeBeginT, int (&)[10]>);
static_assert(!std::is_invocable_v<RangeBeginT, int (&&)[]>);
static_assert( std::is_invocable_v<RangeBeginT, int (&)[]>);
struct BeginMember {
int x;
constexpr const int *begin() const { return &x; }
};
// Ensure that we can't call with rvalues with borrowing disabled.
static_assert( std::is_invocable_v<RangeBeginT, BeginMember &>);
static_assert(!std::is_invocable_v<RangeBeginT, BeginMember &&>);
static_assert( std::is_invocable_v<RangeBeginT, BeginMember const&>);
static_assert(!std::is_invocable_v<RangeBeginT, BeginMember const&&>);
static_assert( std::is_invocable_v<RangeCBeginT, BeginMember &>);
static_assert(!std::is_invocable_v<RangeCBeginT, BeginMember &&>);
static_assert( std::is_invocable_v<RangeCBeginT, BeginMember const&>);
static_assert( std::is_invocable_v<RangeCBeginT, BeginMember const&&>);
constexpr bool testArray() {
int a[2];
assert(std::ranges::begin(a) == a);
assert(std::ranges::cbegin(a) == a);
int b[2][2];
assert(std::ranges::begin(b) == b);
assert(std::ranges::cbegin(b) == b);
BeginMember c[2];
assert(std::ranges::begin(c) == c);
assert(std::ranges::cbegin(c) == c);
return true;
}
struct BeginMemberFunction {
int x;
constexpr const int *begin() const { return &x; }
friend int *begin(BeginMemberFunction const&);
};
struct BeginMemberReturnsInt {
int begin() const;
};
static_assert(!std::is_invocable_v<RangeBeginT, BeginMemberReturnsInt const&>);
struct BeginMemberReturnsVoidPtr {
const void *begin() const;
};
static_assert(!std::is_invocable_v<RangeBeginT, BeginMemberReturnsVoidPtr const&>);
struct EmptyBeginMember {
struct iterator {};
iterator begin() const;
};
static_assert(!std::is_invocable_v<RangeBeginT, EmptyBeginMember const&>);
struct EmptyPtrBeginMember {
struct Empty {};
Empty x;
constexpr const Empty *begin() const { return &x; }
};
struct PtrConvertibleBeginMember {
struct iterator { operator int*() const; };
iterator begin() const;
};
static_assert(!std::is_invocable_v<RangeBeginT, PtrConvertibleBeginMember const&>);
struct NonConstBeginMember {
int x;
constexpr int *begin() { return &x; }
};
static_assert( std::is_invocable_v<RangeBeginT, NonConstBeginMember &>);
static_assert(!std::is_invocable_v<RangeBeginT, NonConstBeginMember const&>);
static_assert(!std::is_invocable_v<RangeCBeginT, NonConstBeginMember &>);
static_assert(!std::is_invocable_v<RangeCBeginT, NonConstBeginMember const&>);
struct EnabledBorrowingBeginMember {
constexpr int *begin() const { return &globalBuff[0]; }
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<EnabledBorrowingBeginMember> = true;
constexpr bool testBeginMember() {
BeginMember a;
assert(std::ranges::begin(a) == &a.x);
assert(std::ranges::cbegin(a) == &a.x);
NonConstBeginMember b;
assert(std::ranges::begin(b) == &b.x);
EnabledBorrowingBeginMember c;
assert(std::ranges::begin(std::move(c)) == &globalBuff[0]);
BeginMemberFunction d;
assert(std::ranges::begin(d) == &d.x);
assert(std::ranges::cbegin(d) == &d.x);
EmptyPtrBeginMember e;
assert(std::ranges::begin(e) == &e.x);
assert(std::ranges::cbegin(e) == &e.x);
return true;
}
struct BeginFunction {
int x;
friend constexpr const int *begin(BeginFunction const& bf) { return &bf.x; }
};
static_assert( std::is_invocable_v<RangeBeginT, BeginFunction const&>);
static_assert(!std::is_invocable_v<RangeBeginT, BeginFunction &&>);
static_assert(!std::is_invocable_v<RangeBeginT, BeginFunction &>);
static_assert( std::is_invocable_v<RangeCBeginT, BeginFunction const&>);
static_assert( std::is_invocable_v<RangeCBeginT, BeginFunction &>);
struct BeginFunctionWithDataMember {
int x;
int begin;
friend constexpr const int *begin(BeginFunctionWithDataMember const& bf) { return &bf.x; }
};
struct BeginFunctionWithPrivateBeginMember {
int y;
friend constexpr const int *begin(BeginFunctionWithPrivateBeginMember const& bf) { return &bf.y; }
private:
const int *begin() const;
};
struct BeginFunctionReturnsEmptyPtr {
struct Empty {};
Empty x;
friend constexpr const Empty *begin(BeginFunctionReturnsEmptyPtr const& bf) { return &bf.x; }
};
struct BeginFunctionByValue {
friend constexpr int *begin(BeginFunctionByValue) { return &globalBuff[1]; }
};
static_assert(!std::is_invocable_v<RangeCBeginT, BeginFunctionByValue>);
struct BeginFunctionEnabledBorrowing {
friend constexpr int *begin(BeginFunctionEnabledBorrowing) { return &globalBuff[2]; }
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<BeginFunctionEnabledBorrowing> = true;
struct BeginFunctionReturnsInt {
friend int begin(BeginFunctionReturnsInt const&);
};
static_assert(!std::is_invocable_v<RangeBeginT, BeginFunctionReturnsInt const&>);
struct BeginFunctionReturnsVoidPtr {
friend void *begin(BeginFunctionReturnsVoidPtr const&);
};
static_assert(!std::is_invocable_v<RangeBeginT, BeginFunctionReturnsVoidPtr const&>);
struct BeginFunctionReturnsEmpty {
struct Empty {};
friend Empty begin(BeginFunctionReturnsEmpty const&);
};
static_assert(!std::is_invocable_v<RangeBeginT, BeginFunctionReturnsEmpty const&>);
struct BeginFunctionReturnsPtrConvertible {
struct iterator { operator int*() const; };
friend iterator begin(BeginFunctionReturnsPtrConvertible const&);
};
static_assert(!std::is_invocable_v<RangeBeginT, BeginFunctionReturnsPtrConvertible const&>);
constexpr bool testBeginFunction() {
BeginFunction a{};
const BeginFunction aa{};
static_assert(!std::invocable<decltype(std::ranges::begin), decltype((a))>);
assert(std::ranges::begin(aa) == &aa.x);
assert(std::ranges::cbegin(a) == &a.x);
assert(std::ranges::cbegin(aa) == &aa.x);
BeginFunctionByValue b{};
const BeginFunctionByValue bb{};
assert(std::ranges::begin(b) == &globalBuff[1]);
assert(std::ranges::begin(bb) == &globalBuff[1]);
assert(std::ranges::cbegin(b) == &globalBuff[1]);
assert(std::ranges::cbegin(bb) == &globalBuff[1]);
BeginFunctionEnabledBorrowing c{};
const BeginFunctionEnabledBorrowing cc{};
assert(std::ranges::begin(std::move(c)) == &globalBuff[2]);
static_assert(!std::invocable<decltype(std::ranges::cbegin), decltype(std::move(c))>);
assert(std::ranges::begin(std::move(cc)) == &globalBuff[2]);
assert(std::ranges::cbegin(std::move(cc)) == &globalBuff[2]);
BeginFunctionReturnsEmptyPtr d{};
const BeginFunctionReturnsEmptyPtr dd{};
static_assert(!std::invocable<decltype(std::ranges::begin), decltype((d))>);
assert(std::ranges::begin(dd) == &dd.x);
assert(std::ranges::cbegin(d) == &d.x);
assert(std::ranges::cbegin(dd) == &dd.x);
BeginFunctionWithDataMember e{};
const BeginFunctionWithDataMember ee{};
static_assert(!std::invocable<decltype(std::ranges::begin), decltype((e))>);
assert(std::ranges::begin(ee) == &ee.x);
assert(std::ranges::cbegin(e) == &e.x);
assert(std::ranges::cbegin(ee) == &ee.x);
BeginFunctionWithPrivateBeginMember f{};
const BeginFunctionWithPrivateBeginMember ff{};
static_assert(!std::invocable<decltype(std::ranges::begin), decltype((f))>);
assert(std::ranges::begin(ff) == &ff.y);
assert(std::ranges::cbegin(f) == &f.y);
assert(std::ranges::cbegin(ff) == &ff.y);
return true;
}
ASSERT_NOEXCEPT(std::ranges::begin(std::declval<int (&)[10]>()));
ASSERT_NOEXCEPT(std::ranges::cbegin(std::declval<int (&)[10]>()));
template<class T>
struct NoThrowMemberBegin {
T begin() const noexcept;
};
ASSERT_NOEXCEPT(std::ranges::begin(std::declval<NoThrowMemberBegin<int*>&>()));
ASSERT_NOEXCEPT(std::ranges::cbegin(std::declval<NoThrowMemberBegin<int*>&>()));
ASSERT_NOT_NOEXCEPT(std::ranges::begin(std::declval<NoThrowMemberBegin<ThrowingIterator<int>>&>()));
ASSERT_NOT_NOEXCEPT(std::ranges::cbegin(std::declval<NoThrowMemberBegin<ThrowingIterator<int>>&>()));
template<class T>
struct NoThrowADLBegin {
friend T begin(NoThrowADLBegin&) noexcept { return T{}; }
friend T begin(NoThrowADLBegin const&) noexcept { return T{}; }
};
ASSERT_NOEXCEPT(std::ranges::begin(std::declval<NoThrowADLBegin<int*>&>()));
ASSERT_NOEXCEPT(std::ranges::cbegin(std::declval<NoThrowADLBegin<int*>&>()));
ASSERT_NOT_NOEXCEPT(std::ranges::begin(std::declval<NoThrowADLBegin<ThrowingIterator<int>>&>()));
ASSERT_NOT_NOEXCEPT(std::ranges::cbegin(std::declval<NoThrowADLBegin<ThrowingIterator<int>>&>()));
int main(int, char**) {
testArray();
static_assert(testArray());
testBeginMember();
static_assert(testBeginMember());
testBeginFunction();
static_assert(testBeginFunction());
return 0;
}
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