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// Copyright 2024 Christian Mazakas
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#if defined(__GNUC__) && __GNUC__ == 7
#pragma GCC diagnostic ignored "-Wnoexcept-type"
#endif
#include <boost/compat/function_ref.hpp>
#include <boost/config.hpp>
#include <boost/config/pragma_message.hpp>
#include <boost/config/workaround.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/lightweight_test_trait.hpp>
int f0() { return -1; }
int g0() { return 7331; }
int f1(int x1) noexcept { return x1; }
int f2(int x1, int x2) { return 10 * x1 + x2; }
int f3(int x1, int x2, int x3) noexcept { return 100 * x1 + 10 * x2 + x3; }
int g(std::unique_ptr<int> p, std::unique_ptr<int> q) { return 10 * *p + *q; }
struct X {
int v = 0;
X() = default;
X(int v_) noexcept : v{v_} {}
};
struct Y {
int v = 0;
Y() = default;
explicit Y(int v_) : v{v_} {}
};
struct Z {
int v = 0;
Z() = default;
Z(int v_) : v{v_} {}
};
namespace compat = boost::compat;
int main() {
#if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<int()>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<int() const>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<int(int)>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<int(int) const>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<int(int, int)>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<int(int, int) const>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<int(int, int, int)>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<int(int, int, int) const>>));
BOOST_TEST_TRAIT_TRUE(
(std::is_trivially_copyable<compat::function_ref<int(std::unique_ptr<int>, std::unique_ptr<int>)>>));
BOOST_TEST_TRAIT_TRUE(
(std::is_trivially_copyable<compat::function_ref<int(std::unique_ptr<int>, std::unique_ptr<int>) const>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<X(int, int, int)>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<X(int, int, int) const>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<void(int, int, int)>>));
BOOST_TEST_TRAIT_TRUE((std::is_trivially_copyable<compat::function_ref<void(int, int, int) const>>));
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
struct W {
int w_;
};
BOOST_TEST_TRAIT_FALSE((std::is_assignable<compat::function_ref<int()>, W>));
BOOST_TEST_TRAIT_FALSE((std::is_assignable<compat::function_ref<int() const>, W>));
BOOST_TEST_TRAIT_FALSE((std::is_assignable<compat::function_ref<int()>, compat::function_ref<int() const>>));
BOOST_TEST_TRAIT_FALSE((std::is_assignable<compat::function_ref<int() const>, compat::function_ref<int()>>));
BOOST_TEST_TRAIT_FALSE((std::is_assignable<compat::function_ref<int()>, compat::function_ref<int(int)>>));
BOOST_TEST_TRAIT_FALSE((std::is_assignable<compat::function_ref<int(int)>, compat::function_ref<int()>>));
#endif
#else
BOOST_PRAGMA_MESSAGE("<type_traits> is incomplete, skipping is_trivially_copyable checks")
#endif
// f0
{
compat::function_ref<int()> fv1(f0);
BOOST_TEST_EQ(fv1(), -1);
compat::function_ref<int() const> fv2(f0);
BOOST_TEST_EQ(fv2(), -1);
}
// f1
{
int x = 1;
compat::function_ref<int(int)> fv1(f1);
BOOST_TEST_EQ(fv1(x), 1);
compat::function_ref<int(int) const> fv2(f1);
BOOST_TEST_EQ(fv2(1), 1);
}
// f2
{
compat::function_ref<int(int, int)> fv1(f2);
BOOST_TEST_EQ(fv1(1, 2), 12);
compat::function_ref<int(int, int) const> fv2(f2);
BOOST_TEST_EQ(fv2(1, 2), 12);
}
// f3
{
compat::function_ref<int(int, int, int)> fv1(f3);
BOOST_TEST_EQ(fv1(1, 2, 3), 123);
compat::function_ref<int(int, int, int) const> fv2(f3);
BOOST_TEST_EQ(fv2(1, 2, 3), 123);
}
// g
{
using S1 = int(std::unique_ptr<int>, std::unique_ptr<int>);
using S2 = int(std::unique_ptr<int>, std::unique_ptr<int>) const;
compat::function_ref<S1> fv1(g);
{
auto p = std::unique_ptr<int>(new int{1});
auto q = std::unique_ptr<int>(new int{2});
BOOST_TEST_EQ(fv1(std::move(p), std::move(q)), 12);
}
compat::function_ref<S2> fv2(g);
{
auto p = std::unique_ptr<int>(new int{130});
auto q = std::unique_ptr<int>(new int{37});
BOOST_TEST_EQ(fv1(std::move(p), std::move(q)), 1337);
}
}
// invoke_r
{
compat::function_ref<X(int, int, int)> fv1(f3);
BOOST_TEST_EQ(fv1(1, 2, 3).v, 123);
BOOST_TEST_TRAIT_FALSE((std::is_constructible<compat::function_ref<Y(int, int, int)>, decltype(f3)>));
BOOST_TEST_TRAIT_TRUE((std::is_constructible<compat::function_ref<Z(int, int, int)>, decltype(f3)>));
compat::function_ref<X(int, int, int) const> fv2(f3);
BOOST_TEST_EQ(fv2(1, 2, 3).v, 123);
BOOST_TEST_TRAIT_FALSE((std::is_constructible<compat::function_ref<Y(int, int, int) const>, decltype(f3)>));
BOOST_TEST_TRAIT_TRUE((std::is_constructible<compat::function_ref<Z(int, int, int) const>, decltype(f3)>));
compat::function_ref<void(int, int, int)> fv3(f3);
fv3(1, 2, 3);
compat::function_ref<void(int, int, int) const> fv4(f3);
fv4(1, 2, 3);
}
// copy construct, copy assign
{
compat::function_ref<int()> fv(f0);
compat::function_ref<int()> fv2(fv);
BOOST_TEST_EQ(fv(), fv2());
fv2 = g0;
BOOST_TEST_EQ(fv2(), 7331);
compat::function_ref<int() const> cfv(f0);
compat::function_ref<int() const> cfv2(cfv);
BOOST_TEST_EQ(cfv(), cfv2());
cfv2 = g0;
BOOST_TEST_EQ(cfv2(), 7331);
}
return boost::report_errors();
}
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