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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// type_traits
// is_invocable
// Most testing of is_invocable is done within the [meta.trans.other] result_of
// tests.
#include <type_traits>
#include <functional>
#include <memory>
#include "test_macros.h"
struct Tag {};
struct DerFromTag : Tag {};
struct Implicit {
Implicit(int) {}
};
struct Explicit {
explicit Explicit(int) {}
};
struct NotCallableWithInt {
int operator()(int) = delete;
int operator()(Tag) { return 42; }
};
int main()
{
{
using Fn = int(Tag::*)(int);
using RFn = int(Tag::*)(int) &&;
// INVOKE bullet 1, 2 and 3
{
// Bullet 1
static_assert(std::is_invocable<Fn, Tag&, int>::value, "");
static_assert(std::is_invocable<Fn, DerFromTag&, int>::value, "");
static_assert(std::is_invocable<RFn, Tag&&, int>::value, "");
static_assert(!std::is_invocable<RFn, Tag&, int>::value, "");
static_assert(!std::is_invocable<Fn, Tag&>::value, "");
static_assert(!std::is_invocable<Fn, Tag const&, int>::value, "");
}
{
// Bullet 2
using T = std::reference_wrapper<Tag>;
using DT = std::reference_wrapper<DerFromTag>;
using CT = std::reference_wrapper<const Tag>;
static_assert(std::is_invocable<Fn, T&, int>::value, "");
static_assert(std::is_invocable<Fn, DT&, int>::value, "");
static_assert(std::is_invocable<Fn, const T&, int>::value, "");
static_assert(std::is_invocable<Fn, T&&, int>::value, "");
static_assert(!std::is_invocable<Fn, CT&, int>::value, "");
static_assert(!std::is_invocable<RFn, T, int>::value, "");
}
{
// Bullet 3
using T = Tag*;
using DT = DerFromTag*;
using CT = const Tag*;
using ST = std::unique_ptr<Tag>;
static_assert(std::is_invocable<Fn, T&, int>::value, "");
static_assert(std::is_invocable<Fn, DT&, int>::value, "");
static_assert(std::is_invocable<Fn, const T&, int>::value, "");
static_assert(std::is_invocable<Fn, T&&, int>::value, "");
static_assert(std::is_invocable<Fn, ST, int>::value, "");
static_assert(!std::is_invocable<Fn, CT&, int>::value, "");
static_assert(!std::is_invocable<RFn, T, int>::value, "");
}
}
{
// Bullets 4, 5 and 6
using Fn = int (Tag::*);
static_assert(!std::is_invocable<Fn>::value, "");
{
// Bullet 4
static_assert(std::is_invocable<Fn, Tag&>::value, "");
static_assert(std::is_invocable<Fn, DerFromTag&>::value, "");
static_assert(std::is_invocable<Fn, Tag&&>::value, "");
static_assert(std::is_invocable<Fn, Tag const&>::value, "");
}
{
// Bullet 5
using T = std::reference_wrapper<Tag>;
using DT = std::reference_wrapper<DerFromTag>;
using CT = std::reference_wrapper<const Tag>;
static_assert(std::is_invocable<Fn, T&>::value, "");
static_assert(std::is_invocable<Fn, DT&>::value, "");
static_assert(std::is_invocable<Fn, const T&>::value, "");
static_assert(std::is_invocable<Fn, T&&>::value, "");
static_assert(std::is_invocable<Fn, CT&>::value, "");
}
{
// Bullet 6
using T = Tag*;
using DT = DerFromTag*;
using CT = const Tag*;
using ST = std::unique_ptr<Tag>;
static_assert(std::is_invocable<Fn, T&>::value, "");
static_assert(std::is_invocable<Fn, DT&>::value, "");
static_assert(std::is_invocable<Fn, const T&>::value, "");
static_assert(std::is_invocable<Fn, T&&>::value, "");
static_assert(std::is_invocable<Fn, ST>::value, "");
static_assert(std::is_invocable<Fn, CT&>::value, "");
}
}
{
// INVOKE bullet 7
{
// Function pointer
using Fp = void(*)(Tag&, int);
static_assert(std::is_invocable<Fp, Tag&, int>::value, "");
static_assert(std::is_invocable<Fp, DerFromTag&, int>::value, "");
static_assert(!std::is_invocable<Fp, const Tag&, int>::value, "");
static_assert(!std::is_invocable<Fp>::value, "");
static_assert(!std::is_invocable<Fp, Tag&>::value, "");
}
{
// Function reference
using Fp = void(&)(Tag&, int);
static_assert(std::is_invocable<Fp, Tag&, int>::value, "");
static_assert(std::is_invocable<Fp, DerFromTag&, int>::value, "");
static_assert(!std::is_invocable<Fp, const Tag&, int>::value, "");
static_assert(!std::is_invocable<Fp>::value, "");
static_assert(!std::is_invocable<Fp, Tag&>::value, "");
}
{
// Function object
using Fn = NotCallableWithInt;
static_assert(std::is_invocable<Fn, Tag>::value, "");
static_assert(!std::is_invocable<Fn, int>::value, "");
}
}
{
// Check that the conversion to the return type is properly checked
using Fn = int(*)();
static_assert(std::is_invocable_r<Implicit, Fn>::value, "");
static_assert(std::is_invocable_r<double, Fn>::value, "");
static_assert(std::is_invocable_r<const volatile void, Fn>::value, "");
static_assert(!std::is_invocable_r<Explicit, Fn>::value, "");
}
{
// Check for is_invocable_v
using Fn = void(*)();
static_assert(std::is_invocable_v<Fn>, "");
static_assert(!std::is_invocable_v<Fn, int>, "");
}
{
// Check for is_invocable_r_v
using Fn = void(*)();
static_assert(std::is_invocable_r_v<void, Fn>, "");
static_assert(!std::is_invocable_r_v<int, Fn>, "");
}
}
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