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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
// constexpr transform_view(View, F);
#include <ranges>
#include <cassert>
struct Range : std::ranges::view_base {
constexpr explicit Range(int* b, int* e) : begin_(b), end_(e) { }
constexpr int* begin() const { return begin_; }
constexpr int* end() const { return end_; }
private:
int* begin_;
int* end_;
};
struct F {
constexpr int operator()(int i) const { return i + 100; }
};
constexpr bool test() {
int buff[] = {1, 2, 3, 4, 5, 6, 7, 8};
{
Range range(buff, buff + 8);
F f;
std::ranges::transform_view<Range, F> view(range, f);
assert(view[0] == 101);
assert(view[1] == 102);
// ...
assert(view[7] == 108);
}
{
Range range(buff, buff + 8);
F f;
std::ranges::transform_view<Range, F> view = {range, f};
assert(view[0] == 101);
assert(view[1] == 102);
// ...
assert(view[7] == 108);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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