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exec-into-variant.pass.cpp
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// src/beman/execution26/tests/exec-into-variant.pass.cpp -*-C++-*-
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include <beman/execution26/detail/into_variant.hpp>
#include <beman/execution26/detail/connect.hpp>
#include <beman/execution26/detail/just.hpp>
#include <beman/execution26/detail/receiver.hpp>
#include <beman/execution26/detail/operation_state.hpp>
#include <beman/execution26/detail/sender.hpp>
#include <test/execution.hpp>
#include <concepts>
#include <exception>
#include <type_traits>
// ----------------------------------------------------------------------------
namespace
{
struct non_sender {};
struct sender
{
using sender_concept = test_std::sender_t;
};
template <typename Signatures = test_std::completion_signatures<>, typename...T>
struct sender_in
{
using sender_concept = test_std::sender_t;
using completion_signatures = Signatures;
decltype(test_std::just(std::declval<T>()...)) inner_sender;
template <typename Receiver>
auto connect(Receiver&& receiver) const noexcept
{
return test_std::connect(this->inner_sender, std::forward<Receiver>(receiver));
}
};
template <typename... T>
sender_in(T&&...) -> sender_in<T...>;
struct receiver
{
using receiver_concept = test_std::receiver_t;
bool* called{};
auto set_error(auto&&) && noexcept -> void {}
auto set_stopped() && noexcept -> void {}
auto set_value(auto&&...) && noexcept -> void { *called = true; }
};
template <bool Expect, typename Signatures = void>
auto test_into_variant(auto&& sender) -> void
{
static_assert(Expect == test_std::sender<std::remove_cvref_t<decltype(sender)>>);
static_assert(Expect == requires{
{ test_std::into_variant(sender) } -> test_std::sender;
});
if constexpr (Expect)
{
static_assert(test_std::receiver<receiver>);
static_assert(requires{
typename std::decay_t<decltype(sender)>;
typename std::decay_t<decltype(sender)>::completion_signatures;
test_std::get_completion_signatures(sender, test_std::empty_env{});
typename test_std::value_types_of_t<std::decay_t<decltype(sender)>, test_std::empty_env>;
test_std::into_variant(sender);
test_std::into_variant(sender).connect(receiver{});
{ test_std::connect(test_std::into_variant(sender), receiver{}) } -> test_std::operation_state;
});
static_assert(std::same_as<
Signatures,
decltype(test_std::get_completion_signatures(test_std::into_variant(sender), test_std::empty_env{}))
>);
bool called{false};
auto op{test_std::connect(test_std::into_variant(sender), receiver{&called})};
assert(not called);
op.start();
assert(called);
}
}
struct error_receiver
{
using receiver_concept = test_std::receiver_t;
bool* called{};
auto set_error(int e) && noexcept -> void
{
*this->called = e == 17;
}
auto set_error(std::exception_ptr) && noexcept -> void {}
auto set_stopped() && noexcept -> void {}
auto set_value(auto&&...) && noexcept -> void {}
};
auto test_into_variant_error() -> void
{
bool called{};
auto op{test_std::connect(test_std::into_variant(test_std::just_error(17)),
error_receiver{&called})};
assert(not called);
test_std::start(op);
assert(called);
}
struct stopped_receiver
{
using receiver_concept = test_std::receiver_t;
bool* called{};
auto set_error(std::exception_ptr) && noexcept -> void {}
auto set_stopped() && noexcept -> void { *this->called = true; }
auto set_value(auto&&...) && noexcept -> void {}
};
auto test_into_variant_stopped() -> void
{
bool called{};
auto op{test_std::connect(test_std::into_variant(test_std::just_stopped()),
stopped_receiver{&called})};
assert(not called);
test_std::start(op);
assert(called);
}
}
auto main() -> int
{
struct arg {};
struct error {};
static_assert(std::same_as<
test_std::into_variant_t const,
decltype(test_std::into_variant)
>);
test_into_variant_error();
test_into_variant_stopped();
test_into_variant<false>(non_sender{});
//test_into_variant<true>(sender{});
test_into_variant<true,
test_std::completion_signatures<>
>(sender_in<test_std::completion_signatures<>>{});
test_into_variant<true,
test_std::completion_signatures<
test_std::set_value_t(std::variant<std::tuple<>>)
>
>(sender_in<test_std::completion_signatures<
test_std::set_value_t()
>>{});
test_into_variant<true,
test_std::completion_signatures<
test_std::set_value_t(std::variant<std::tuple<>>),
test_std::set_error_t(error)
>
>(sender_in<test_std::completion_signatures<
test_std::set_value_t(),
test_std::set_error_t(error)
>>{});
test_into_variant<true,
test_std::completion_signatures<
test_std::set_value_t(std::variant<std::tuple<>>),
test_std::set_error_t(error),
test_std::set_stopped_t()
>
>(sender_in<test_std::completion_signatures<
test_std::set_value_t(),
test_std::set_error_t(error),
test_std::set_stopped_t()
>>{});
test_into_variant<true,
test_std::completion_signatures<
test_std::set_value_t(std::variant<
std::tuple<>,
std::tuple<arg, arg>
>),
test_std::set_error_t(error),
test_std::set_stopped_t()
>
>(sender_in<test_std::completion_signatures<
test_std::set_value_t(),
test_std::set_value_t(arg, arg),
test_std::set_error_t(error),
test_std::set_stopped_t()
>>{});
}