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// Range v3 library
//
// Copyright Eric Niebler 2014-present
// Copyright Casey Carter 2015
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
#include <memory>
#include <range/v3/functional/invoke.hpp>
#include <range/v3/functional/not_fn.hpp>
#include <range/v3/view/filter.hpp>
#include "../simple_test.hpp"
#include "../test_utils.hpp"
CPP_assert(ranges::constructible_from<ranges::reference_wrapper<int>, int&>);
CPP_assert(!ranges::constructible_from<ranges::reference_wrapper<int>, int&&>);
CPP_assert(!ranges::constructible_from<ranges::reference_wrapper<int &&>, int&>);
CPP_assert(ranges::constructible_from<ranges::reference_wrapper<int &&>, int&&>);
namespace
{
struct Integer
{
int i;
operator int() const { return i; }
bool odd() const { return (i % 2) != 0; }
};
enum class kind { lvalue, const_lvalue, rvalue, const_rvalue };
std::ostream &operator<<(std::ostream &os, kind k)
{
const char* message = nullptr;
switch (k) {
case kind::lvalue:
message = "lvalue";
break;
case kind::const_lvalue:
message = "const_lvalue";
break;
case kind::rvalue:
message = "rvalue";
break;
case kind::const_rvalue:
message = "const_rvalue";
break;
}
return os << message;
}
kind last_call;
template<kind DisableKind>
struct fn
{
bool operator()() &
{
last_call = kind::lvalue;
return DisableKind != kind::lvalue;
}
bool operator()() const &
{
last_call = kind::const_lvalue;
return DisableKind != kind::const_lvalue;
}
bool operator()() &&
{
last_call = kind::rvalue;
return DisableKind != kind::rvalue;
}
bool operator()() const &&
{
last_call = kind::const_rvalue;
return DisableKind != kind::const_rvalue;
}
};
constexpr struct {
template<typename T>
constexpr T&& operator()(T&& arg) const noexcept {
return (T&&)arg;
}
} h = {};
struct A {
int i = 13;
constexpr int f() const noexcept { return 42; }
constexpr /*c++14*/ int g(int j) { return 2 * j; }
};
constexpr int f() noexcept { return 13; }
constexpr int g(int i) { return 2 * i + 1; }
void test_invoke()
{
CHECK(ranges::invoke(f) == 13);
// CHECK(noexcept(ranges::invoke(f) == 13));
CHECK(ranges::invoke(g, 2) == 5);
CHECK(ranges::invoke(h, 42) == 42);
CHECK(noexcept(ranges::invoke(h, 42) == 42));
{
int i = 13;
CHECK(&ranges::invoke(h, i) == &i);
CHECK(noexcept(&ranges::invoke(h, i) == &i));
}
CHECK(ranges::invoke(&A::f, A{}) == 42);
// CHECK(noexcept(ranges::invoke(&A::f, A{}) == 42));
CHECK(ranges::invoke(&A::g, A{}, 2) == 4);
{
A a;
const auto& ca = a;
CHECK(ranges::invoke(&A::f, a) == 42);
// CHECK(noexcept(ranges::invoke(&A::f, a) == 42));
CHECK(ranges::invoke(&A::f, ca) == 42);
// CHECK(noexcept(ranges::invoke(&A::f, ca) == 42));
CHECK(ranges::invoke(&A::g, a, 2) == 4);
}
{
A a;
const auto& ca = a;
CHECK(ranges::invoke(&A::f, &a) == 42);
// CHECK(noexcept(ranges::invoke(&A::f, &a) == 42));
CHECK(ranges::invoke(&A::f, &ca) == 42);
// CHECK(noexcept(ranges::invoke(&A::f, &ca) == 42));
CHECK(ranges::invoke(&A::g, &a, 2) == 4);
}
{
std::unique_ptr<A> up(new A);
CHECK(ranges::invoke(&A::f, up) == 42);
CHECK(ranges::invoke(&A::g, up, 2) == 4);
}
{
auto sp = std::make_shared<A>();
CHECK(ranges::invoke(&A::f, sp) == 42);
// CHECK(noexcept(ranges::invoke(&A::f, sp) == 42));
CHECK(ranges::invoke(&A::g, sp, 2) == 4);
}
CHECK(ranges::invoke(&A::i, A{}) == 13);
// CHECK(noexcept(ranges::invoke(&A::i, A{}) == 13));
{ int&& tmp = ranges::invoke(&A::i, A{}); (void)tmp; }
{
A a;
const auto& ca = a;
CHECK(ranges::invoke(&A::i, a) == 13);
// CHECK(noexcept(ranges::invoke(&A::i, a) == 13));
CHECK(ranges::invoke(&A::i, ca) == 13);
// CHECK(noexcept(ranges::invoke(&A::i, ca) == 13));
CHECK(ranges::invoke(&A::i, &a) == 13);
// CHECK(noexcept(ranges::invoke(&A::i, &a) == 13));
CHECK(ranges::invoke(&A::i, &ca) == 13);
// CHECK(noexcept(ranges::invoke(&A::i, &ca) == 13));
ranges::invoke(&A::i, a) = 0;
CHECK(a.i == 0);
ranges::invoke(&A::i, &a) = 1;
CHECK(a.i == 1);
CPP_assert(ranges::same_as<decltype(ranges::invoke(&A::i, ca)), const int&>);
CPP_assert(ranges::same_as<decltype(ranges::invoke(&A::i, &ca)), const int&>);
}
{
std::unique_ptr<A> up(new A);
CHECK(ranges::invoke(&A::i, up) == 13);
ranges::invoke(&A::i, up) = 0;
CHECK(up->i == 0);
}
{
auto sp = std::make_shared<A>();
CHECK(ranges::invoke(&A::i, sp) == 13);
ranges::invoke(&A::i, sp) = 0;
CHECK(sp->i == 0);
}
// {
// struct B { int i = 42; constexpr int f() const { return i; } };
// constexpr B b;
// static_assert(b.i == 42, "");
// static_assert(b.f() == 42, "");
// static_assert(ranges::invoke_detail::impl(&B::i, b) == 42, "");
// static_assert(ranges::invoke_detail::impl(&B::i, &b) == 42, "");
// static_assert(ranges::invoke_detail::impl(&B::i, B{}) == 42, "");
// static_assert(ranges::invoke_detail::impl(&B::f, b) == 42, "");
// static_assert(ranges::invoke_detail::impl(&B::f, &b) == 42, "");
// static_assert(ranges::invoke_detail::impl(&B::f, B{}) == 42, "");
// }
}
} // unnamed namespace
int main()
{
{
// Check that not_fn works with callables
Integer some_ints[] = {{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}};
::check_equal(some_ints | ranges::views::filter(ranges::not_fn(&Integer::odd)),
{0,2,4,6});
}
// Check that not_fn forwards value category
{
constexpr auto k = kind::lvalue;
using F = fn<k>;
auto f = ranges::not_fn(F{});
CHECK(f() == true);
CHECK(last_call == k);
}
{
constexpr auto k = kind::const_lvalue;
using F = fn<k>;
auto const f = ranges::not_fn(F{});
CHECK(f() == true);
CHECK(last_call == k);
}
{
constexpr auto k = kind::rvalue;
using F = fn<k>;
auto f = ranges::not_fn(F{});
CHECK(std::move(f)() == true); // xvalue
CHECK(last_call == k);
CHECK(decltype(f){}() == true); // prvalue
CHECK(last_call == k);
}
#ifdef _WIN32
{
// Ensure that invocable accepts pointers to functions with non-default calling conventions.
CPP_assert(ranges::invocable<void(__cdecl*)()>);
CPP_assert(ranges::invocable<void(__stdcall*)()>);
CPP_assert(ranges::invocable<void(__fastcall*)()>);
CPP_assert(ranges::invocable<void(__thiscall*)()>);
#ifndef __MINGW32__
CPP_assert(ranges::invocable<void(__vectorcall*)()>);
#endif
}
#endif // _WIN32
test_invoke();
return ::test_result();
}
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