//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <functional>
// reference_wrapper
// template <class... ArgTypes>
// constexpr typename result_of<T&(ArgTypes&&...)>::type // constexpr since C++20
// operator() (ArgTypes&&...) const
// noexcept(is_nothrow_invocable_v<T&, ArgTypes...>); // noexcept since C++17
#include <functional>
#include <cassert>
#include "test_macros.h"
#if TEST_STD_VER > 14
# define INVOKE_NOEXCEPT(expected, ...) static_assert(noexcept(__VA_ARGS__) == expected)
#else
# define INVOKE_NOEXCEPT(expected, ...)
#endif
int count = 0;
// 1 arg, return void
void f_void_1(int i)
{
count += i;
}
struct A_void_1
{
void operator()(int i)
{
count += i;
}
void mem1() {++count;}
void mem2() const {++count;}
};
void
test_void_1()
{
int save_count = count;
// function
{
std::reference_wrapper<void (int)> r1(f_void_1);
int i = 2;
r1(i);
INVOKE_NOEXCEPT(false, r1(i));
assert(count == save_count+2);
save_count = count;
}
// function pointer
{
void (*fp)(int) = f_void_1;
std::reference_wrapper<void (*)(int)> r1(fp);
int i = 3;
r1(i);
INVOKE_NOEXCEPT(false, r1(i));
assert(count == save_count+3);
save_count = count;
}
// functor
{
A_void_1 a0;
std::reference_wrapper<A_void_1> r1(a0);
int i = 4;
r1(i);
INVOKE_NOEXCEPT(false, r1(i));
assert(count == save_count+4);
save_count = count;
}
// member function pointer
{
void (A_void_1::*fp)() = &A_void_1::mem1;
std::reference_wrapper<void (A_void_1::*)()> r1(fp);
A_void_1 a;
r1(a);
INVOKE_NOEXCEPT(false, r1(a));
assert(count == save_count+1);
save_count = count;
A_void_1* ap = &a;
r1(ap);
INVOKE_NOEXCEPT(false, r1(ap));
assert(count == save_count+1);
save_count = count;
}
// const member function pointer
{
void (A_void_1::*fp)() const = &A_void_1::mem2;
std::reference_wrapper<void (A_void_1::*)() const> r1(fp);
A_void_1 a;
r1(a);
INVOKE_NOEXCEPT(false, r1(a));
assert(count == save_count+1);
save_count = count;
A_void_1* ap = &a;
r1(ap);
INVOKE_NOEXCEPT(false, r1(ap));
assert(count == save_count+1);
save_count = count;
}
}
// 1 arg, return int
int f_int_1(int i)
{
return i + 1;
}
struct A_int_1
{
A_int_1() : data_(5) {}
int operator()(int i)
{
return i - 1;
}
int mem1() {return 3;}
int mem2() const {return 4;}
int data_;
};
void
test_int_1()
{
// function
{
std::reference_wrapper<int (int)> r1(f_int_1);
int i = 2;
assert(r1(i) == 3);
INVOKE_NOEXCEPT(false, r1(i));
}
// function pointer
{
int (*fp)(int) = f_int_1;
std::reference_wrapper<int (*)(int)> r1(fp);
int i = 3;
assert(r1(i) == 4);
INVOKE_NOEXCEPT(false, r1(i));
}
// functor
{
A_int_1 a0;
std::reference_wrapper<A_int_1> r1(a0);
int i = 4;
assert(r1(i) == 3);
INVOKE_NOEXCEPT(false, r1(i));
}
// member function pointer
{
int (A_int_1::*fp)() = &A_int_1::mem1;
std::reference_wrapper<int (A_int_1::*)()> r1(fp);
A_int_1 a;
assert(r1(a) == 3);
INVOKE_NOEXCEPT(false, r1(a));
A_int_1* ap = &a;
assert(r1(ap) == 3);
INVOKE_NOEXCEPT(false, r1(ap));
}
// const member function pointer
{
int (A_int_1::*fp)() const = &A_int_1::mem2;
std::reference_wrapper<int (A_int_1::*)() const> r1(fp);
A_int_1 a;
assert(r1(a) == 4);
INVOKE_NOEXCEPT(false, r1(a));
A_int_1* ap = &a;
assert(r1(ap) == 4);
INVOKE_NOEXCEPT(false, r1(ap));
}
// member data pointer
{
int A_int_1::*fp = &A_int_1::data_;
std::reference_wrapper<int A_int_1::*> r1(fp);
A_int_1 a;
assert(r1(a) == 5);
INVOKE_NOEXCEPT(true, r1(a));
r1(a) = 6;
assert(r1(a) == 6);
A_int_1* ap = &a;
assert(r1(ap) == 6);
r1(ap) = 7;
assert(r1(ap) == 7);
INVOKE_NOEXCEPT(true, r1(ap));
}
}
// 2 arg, return void
void f_void_2(int i, int j)
{
count += i+j;
}
struct A_void_2
{
void operator()(int i, int j)
{
count += i+j;
}
void mem1(int i) {count += i;}
void mem2(int i) const {count += i;}
};
void
test_void_2()
{
int save_count = count;
// function
{
std::reference_wrapper<void (int, int)> r1(f_void_2);
int i = 2;
int j = 3;
r1(i, j);
INVOKE_NOEXCEPT(false, r1(i, j));
assert(count == save_count+5);
save_count = count;
}
// function pointer
{
void (*fp)(int, int) = f_void_2;
std::reference_wrapper<void (*)(int, int)> r1(fp);
int i = 3;
int j = 4;
r1(i, j);
INVOKE_NOEXCEPT(false, r1(i, j));
assert(count == save_count+7);
save_count = count;
}
// functor
{
A_void_2 a0;
std::reference_wrapper<A_void_2> r1(a0);
int i = 4;
int j = 5;
r1(i, j);
INVOKE_NOEXCEPT(false, r1(i, j));
assert(count == save_count+9);
save_count = count;
}
// member function pointer
{
void (A_void_2::*fp)(int) = &A_void_2::mem1;
std::reference_wrapper<void (A_void_2::*)(int)> r1(fp);
A_void_2 a;
int i = 3;
r1(a, i);
assert(count == save_count+3);
save_count = count;
A_void_2* ap = &a;
r1(ap, i);
INVOKE_NOEXCEPT(false, r1(ap, i));
assert(count == save_count+3);
save_count = count;
}
// const member function pointer
{
void (A_void_2::*fp)(int) const = &A_void_2::mem2;
std::reference_wrapper<void (A_void_2::*)(int) const> r1(fp);
A_void_2 a;
int i = 4;
r1(a, i);
INVOKE_NOEXCEPT(false, r1(a, i));
assert(count == save_count+4);
save_count = count;
A_void_2* ap = &a;
r1(ap, i);
INVOKE_NOEXCEPT(false, r1(ap, i));
assert(count == save_count+4);
save_count = count;
}
}
// 2 arg, return int
int f_int_2(int i, int j)
{
return i+j;
}
struct A_int_2
{
int operator()(int i, int j)
{
return i+j;
}
int mem1(int i) {return i+1;}
int mem2(int i) const {return i+2;}
};
void
test_int_2()
{
// function
{
std::reference_wrapper<int (int, int)> r1(f_int_2);
int i = 2;
int j = 3;
assert(r1(i, j) == i+j);
INVOKE_NOEXCEPT(false, r1(i, j));
}
// function pointer
{
int (*fp)(int, int) = f_int_2;
std::reference_wrapper<int (*)(int, int)> r1(fp);
int i = 3;
int j = 4;
assert(r1(i, j) == i+j);
INVOKE_NOEXCEPT(false, r1(i, j));
}
// functor
{
A_int_2 a0;
std::reference_wrapper<A_int_2> r1(a0);
int i = 4;
int j = 5;
assert(r1(i, j) == i+j);
INVOKE_NOEXCEPT(false, r1(i, j));
}
// member function pointer
{
int(A_int_2::*fp)(int) = &A_int_2::mem1;
std::reference_wrapper<int (A_int_2::*)(int)> r1(fp);
A_int_2 a;
int i = 3;
assert(r1(a, i) == i+1);
INVOKE_NOEXCEPT(false, r1(a, i));
A_int_2* ap = &a;
assert(r1(ap, i) == i+1);
INVOKE_NOEXCEPT(false, r1(ap, i));
}
// const member function pointer
{
int (A_int_2::*fp)(int) const = &A_int_2::mem2;
std::reference_wrapper<int (A_int_2::*)(int) const> r1(fp);
A_int_2 a;
int i = 4;
assert(r1(a, i) == i+2);
INVOKE_NOEXCEPT(false, r1(a, i));
A_int_2* ap = &a;
assert(r1(ap, i) == i+2);
INVOKE_NOEXCEPT(false, r1(ap, i));
}
}
#if TEST_STD_VER >= 11
// 1 arg, return void, noexcept
void f_void_1_noexcept(int i) noexcept
{
count += i;
}
struct A_void_1_noexcept
{
void operator()(int i) noexcept
{
count += i;
}
void mem1() noexcept {++count;}
void mem2() const noexcept {++count;}
};
void
test_void_1_noexcept()
{
int save_count = count;
// function
{
std::reference_wrapper<void (int) noexcept> r1(f_void_1_noexcept);
int i = 2;
r1(i);
INVOKE_NOEXCEPT(true, r1(i));
assert(count == save_count+2);
save_count = count;
}
// function pointer
{
void (*fp)(int) noexcept = f_void_1_noexcept;
std::reference_wrapper<void (*)(int) noexcept> r1(fp);
int i = 3;
r1(i);
INVOKE_NOEXCEPT(true, r1(i));
assert(count == save_count+3);
save_count = count;
}
// functor
{
A_void_1_noexcept a0;
std::reference_wrapper<A_void_1_noexcept> r1(a0);
int i = 4;
r1(i);
INVOKE_NOEXCEPT(true, r1(i));
assert(count == save_count+4);
save_count = count;
}
// member function pointer
{
void (A_void_1_noexcept::*fp)() noexcept = &A_void_1_noexcept::mem1;
std::reference_wrapper<void (A_void_1_noexcept::*)() noexcept> r1(fp);
A_void_1_noexcept a;
r1(a);
INVOKE_NOEXCEPT(true, r1(a));
assert(count == save_count+1);
save_count = count;
A_void_1_noexcept* ap = &a;
r1(ap);
INVOKE_NOEXCEPT(true, r1(ap));
assert(count == save_count+1);
save_count = count;
}
// const member function pointer
{
void (A_void_1_noexcept::*fp)() const noexcept = &A_void_1_noexcept::mem2;
std::reference_wrapper<void (A_void_1_noexcept::*)() const noexcept> r1(fp);
A_void_1_noexcept a;
r1(a);
INVOKE_NOEXCEPT(true, r1(a));
assert(count == save_count+1);
save_count = count;
A_void_1_noexcept* ap = &a;
r1(ap);
INVOKE_NOEXCEPT(true, r1(ap));
assert(count == save_count+1);
save_count = count;
}
}
// 1 arg, return int, noexcept
int f_int_1_noexcept(int i) noexcept
{
return i + 1;
}
struct A_int_1_noexcept
{
A_int_1_noexcept() : data_(5) {}
int operator()(int i) noexcept
{
return i - 1;
}
int mem1() noexcept {return 3;}
int mem2() const noexcept {return 4;}
int data_;
};
void
test_int_1_noexcept()
{
// function
{
std::reference_wrapper<int (int) noexcept> r1(f_int_1_noexcept);
int i = 2;
assert(r1(i) == 3);
INVOKE_NOEXCEPT(true, r1(i));
}
// function pointer
{
int (*fp)(int) noexcept = f_int_1_noexcept;
std::reference_wrapper<int (*)(int) noexcept> r1(fp);
int i = 3;
assert(r1(i) == 4);
INVOKE_NOEXCEPT(true, r1(i));
}
// functor
{
A_int_1_noexcept a0;
std::reference_wrapper<A_int_1_noexcept> r1(a0);
int i = 4;
assert(r1(i) == 3);
INVOKE_NOEXCEPT(true, r1(i));
}
// member function pointer
{
int (A_int_1_noexcept::*fp)() noexcept = &A_int_1_noexcept::mem1;
std::reference_wrapper<int (A_int_1_noexcept::*)() noexcept> r1(fp);
A_int_1_noexcept a;
assert(r1(a) == 3);
INVOKE_NOEXCEPT(true, r1(a));
A_int_1_noexcept* ap = &a;
assert(r1(ap) == 3);
INVOKE_NOEXCEPT(true, r1(ap));
}
// const member function pointer
{
int (A_int_1_noexcept::*fp)() const noexcept = &A_int_1_noexcept::mem2;
std::reference_wrapper<int (A_int_1_noexcept::*)() const noexcept> r1(fp);
A_int_1_noexcept a;
assert(r1(a) == 4);
INVOKE_NOEXCEPT(true, r1(a));
A_int_1_noexcept* ap = &a;
assert(r1(ap) == 4);
INVOKE_NOEXCEPT(true, r1(ap));
}
// member data pointer
{
int A_int_1_noexcept::*fp = &A_int_1_noexcept::data_;
std::reference_wrapper<int A_int_1_noexcept::*> r1(fp);
A_int_1_noexcept a;
assert(r1(a) == 5);
INVOKE_NOEXCEPT(true, r1(a));
r1(a) = 6;
assert(r1(a) == 6);
A_int_1_noexcept* ap = &a;
assert(r1(ap) == 6);
r1(ap) = 7;
assert(r1(ap) == 7);
INVOKE_NOEXCEPT(true, r1(ap));
}
}
// 2 arg, return void, noexcept
void f_void_2_noexcept(int i, int j) noexcept
{
count += i+j;
}
struct A_void_2_noexcept
{
void operator()(int i, int j) noexcept
{
count += i+j;
}
void mem1(int i) noexcept {count += i;}
void mem2(int i) const noexcept {count += i;}
};
void
test_void_2_noexcept()
{
int save_count = count;
// function
{
std::reference_wrapper<void (int, int) noexcept> r1(f_void_2_noexcept);
int i = 2;
int j = 3;
r1(i, j);
INVOKE_NOEXCEPT(true, r1(i, j));
assert(count == save_count+5);
save_count = count;
}
// function pointer
{
void (*fp)(int, int) noexcept = f_void_2_noexcept;
std::reference_wrapper<void (*)(int, int) noexcept> r1(fp);
int i = 3;
int j = 4;
r1(i, j);
INVOKE_NOEXCEPT(true, r1(i, j));
assert(count == save_count+7);
save_count = count;
}
// functor
{
A_void_2_noexcept a0;
std::reference_wrapper<A_void_2_noexcept> r1(a0);
int i = 4;
int j = 5;
r1(i, j);
INVOKE_NOEXCEPT(true, r1(i, j));
assert(count == save_count+9);
save_count = count;
}
// member function pointer
{
void (A_void_2_noexcept::*fp)(int) noexcept = &A_void_2_noexcept::mem1;
std::reference_wrapper<void (A_void_2_noexcept::*)(int) noexcept> r1(fp);
A_void_2_noexcept a;
int i = 3;
r1(a, i);
assert(count == save_count+3);
save_count = count;
A_void_2_noexcept* ap = &a;
r1(ap, i);
INVOKE_NOEXCEPT(true, r1(ap, i));
assert(count == save_count+3);
save_count = count;
}
// const member function pointer
{
void (A_void_2_noexcept::*fp)(int) const noexcept = &A_void_2_noexcept::mem2;
std::reference_wrapper<void (A_void_2_noexcept::*)(int) const noexcept> r1(fp);
A_void_2_noexcept a;
int i = 4;
r1(a, i);
INVOKE_NOEXCEPT(true, r1(a, i));
assert(count == save_count+4);
save_count = count;
A_void_2_noexcept* ap = &a;
r1(ap, i);
INVOKE_NOEXCEPT(true, r1(ap, i));
assert(count == save_count+4);
save_count = count;
}
}
// 2 arg, return int, noexcept
int f_int_2_noexcept(int i, int j) noexcept
{
return i+j;
}
struct A_int_2_noexcept
{
int operator()(int i, int j) noexcept
{
return i+j;
}
int mem1(int i) noexcept {return i+1;}
int mem2(int i) const noexcept {return i+2;}
};
void
test_int_2_noexcept()
{
// function
{
std::reference_wrapper<int (int, int) noexcept> r1(f_int_2_noexcept);
int i = 2;
int j = 3;
assert(r1(i, j) == i+j);
INVOKE_NOEXCEPT(true, r1(i, j));
}
// function pointer
{
int (*fp)(int, int) noexcept = f_int_2_noexcept;
std::reference_wrapper<int (*)(int, int) noexcept> r1(fp);
int i = 3;
int j = 4;
assert(r1(i, j) == i+j);
INVOKE_NOEXCEPT(true, r1(i, j));
}
// functor
{
A_int_2_noexcept a0;
std::reference_wrapper<A_int_2_noexcept> r1(a0);
int i = 4;
int j = 5;
assert(r1(i, j) == i+j);
INVOKE_NOEXCEPT(true, r1(i, j));
}
// member function pointer
{
int(A_int_2_noexcept::*fp)(int) noexcept = &A_int_2_noexcept::mem1;
std::reference_wrapper<int (A_int_2_noexcept::*)(int) noexcept> r1(fp);
A_int_2_noexcept a;
int i = 3;
assert(r1(a, i) == i+1);
INVOKE_NOEXCEPT(true, r1(a, i));
A_int_2_noexcept* ap = &a;
assert(r1(ap, i) == i+1);
INVOKE_NOEXCEPT(true, r1(ap, i));
}
// const member function pointer
{
int (A_int_2_noexcept::*fp)(int) const noexcept = &A_int_2_noexcept::mem2;
std::reference_wrapper<int (A_int_2_noexcept::*)(int) const noexcept> r1(fp);
A_int_2_noexcept a;
int i = 4;
assert(r1(a, i) == i+2);
INVOKE_NOEXCEPT(true, r1(a, i));
A_int_2_noexcept* ap = &a;
assert(r1(ap, i) == i+2);
INVOKE_NOEXCEPT(true, r1(ap, i));
}
}
#endif // TEST_STD_VER >= 11
int main(int, char**)
{
test_void_1();
test_int_1();
test_void_2();
test_int_2();
#if TEST_STD_VER >= 11
test_void_1_noexcept();
test_int_1_noexcept();
test_void_2_noexcept();
test_int_2_noexcept();
#endif // TEST_STD_VER >= 11
return 0;
}
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