BlackMATov/invoke.hpp
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Matvey Cherevko
2018-12-08 08:08:03 +07:00
commit bf712766d8
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build/*
CMakeLists.txt.user

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cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
project(invoke)
file(GLOB test_sources "*.cpp" "*.hpp")
add_executable(${PROJECT_NAME} ${test_sources})
set_target_properties(${PROJECT_NAME} PROPERTIES
CXX_STANDARD 14
CXX_STANDARD_REQUIRED YES
CXX_EXTENSIONS NO)
enable_testing()
add_test(${PROJECT_NAME} ${PROJECT_NAME})

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MIT License
Copyright (c) 2018 Matvey Cherevko
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# invoke.hpp
> std::invoke/std::apply analogs for C++14
[invoke]: https://github.com/BlackMATov/invoke.hpp
## Installation
[invoke.hpp][invoke] is a single header library. All you need to do is copy the header file into your project and include this file:
```cpp
#include "invoke.hpp"
```
## API
### `invoke_hpp::invoke(F&& f, Args&&... args)`
Analog of [std::invoke](https://en.cppreference.com/w/cpp/utility/functional/invoke) from C++17
### `invoke_hpp::invoke_result<F, Args...>`
Analog of [std::invoke_result](https://en.cppreference.com/w/cpp/types/result_of) from C++17
### `invoke_hpp::apply(F&& f, Tuple&& args)`
Analog of [std::apply](https://en.cppreference.com/w/cpp/utility/apply) from C++17

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#pragma once
#include <tuple>
#include <utility>
#include <functional>
#include <type_traits>
#define INVOKE_HPP_NOEXCEPT_RETURN(...) \
noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; }
#define INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(...) \
noexcept(noexcept(__VA_ARGS__)) -> decltype (__VA_ARGS__) { return __VA_ARGS__; }
//
// void_t
//
namespace invoke_hpp
{
namespace impl
{
template < typename... Args >
struct make_void {
using type = void;
};
}
template < typename... Args >
using void_t = typename impl::make_void<Args...>::type;
}
//
// is_reference_wrapper
//
namespace invoke_hpp
{
namespace impl
{
template < typename T >
struct is_reference_wrapper_impl
: std::false_type {};
template < typename U >
struct is_reference_wrapper_impl<std::reference_wrapper<U>>
: std::true_type {};
}
template < typename T >
struct is_reference_wrapper
: impl::is_reference_wrapper_impl<std::remove_cv_t<T>> {};
}
//
// invoke
//
namespace invoke_hpp
{
namespace impl
{
//
// invoke_member_object_impl
//
template
<
typename Base, typename F, typename Derived,
typename std::enable_if_t<std::is_base_of<Base, std::decay_t<Derived>>::value, int> = 0
>
constexpr auto invoke_member_object_impl(F Base::* f, Derived&& ref)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<Derived>(ref).*f)
template
<
typename Base, typename F, typename RefWrap,
typename std::enable_if_t<is_reference_wrapper<std::decay_t<RefWrap>>::value, int> = 0
>
constexpr auto invoke_member_object_impl(F Base::* f, RefWrap&& ref)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
ref.get().*f)
template
<
typename Base, typename F, typename Pointer,
typename std::enable_if_t<
!std::is_base_of<Base, std::decay_t<Pointer>>::value &&
!is_reference_wrapper<std::decay_t<Pointer>>::value
, int> = 0
>
constexpr auto invoke_member_object_impl(F Base::* f, Pointer&& ptr)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
(*std::forward<Pointer>(ptr)).*f)
//
// invoke_member_function_impl
//
template
<
typename Base, typename F, typename Derived, typename... Args,
typename std::enable_if_t<std::is_base_of<Base, std::decay_t<Derived>>::value, int> = 0
>
constexpr auto invoke_member_function_impl(F Base::* f, Derived&& ref, Args&&... args)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
(std::forward<Derived>(ref).*f)(std::forward<Args>(args)...))
template
<
typename Base, typename F, typename RefWrap, typename... Args,
typename std::enable_if_t<is_reference_wrapper<std::decay_t<RefWrap>>::value, int> = 0
>
constexpr auto invoke_member_function_impl(F Base::* f, RefWrap&& ref, Args&&... args)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
(ref.get().*f)(std::forward<Args>(args)...))
template
<
typename Base, typename F, typename Pointer, typename... Args,
typename std::enable_if_t<
!std::is_base_of<Base, std::decay_t<Pointer>>::value &&
!is_reference_wrapper<std::decay_t<Pointer>>::value
, int> = 0
>
constexpr auto invoke_member_function_impl(F Base::* f, Pointer&& ptr, Args&&... args)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
((*std::forward<Pointer>(ptr)).*f)(std::forward<Args>(args)...))
}
template
<
typename F, typename... Args,
typename std::enable_if_t<!std::is_member_pointer<std::decay_t<F>>::value, int> = 0
>
constexpr auto invoke(F&& f, Args&&... args)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<F>(f)(std::forward<Args>(args)...))
template
<
typename F, typename T,
typename std::enable_if_t<std::is_member_object_pointer<std::decay_t<F>>::value, int> = 0
>
constexpr auto invoke(F&& f, T&& t)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
impl::invoke_member_object_impl(std::forward<F>(f), std::forward<T>(t)))
template
<
typename F, typename... Args,
typename std::enable_if_t<std::is_member_function_pointer<std::decay_t<F>>::value, int> = 0
>
constexpr auto invoke(F&& f, Args&&... args)
INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN(
impl::invoke_member_function_impl(std::forward<F>(f), std::forward<Args>(args)...))
}
//
// invoke_result
//
namespace invoke_hpp
{
namespace impl
{
struct invoke_result_impl_tag {};
template < typename Void, typename F, typename... Args >
struct invoke_result_impl {};
template < typename F, typename... Args >
struct invoke_result_impl<void_t<invoke_result_impl_tag, decltype(invoke_hpp::invoke(std::declval<F>(), std::declval<Args>()...))>, F, Args...> {
using type = decltype(invoke_hpp::invoke(std::declval<F>(), std::declval<Args>()...));
};
}
template < typename F, typename... Args >
struct invoke_result
: impl::invoke_result_impl<void, F, Args...> {};
template < typename F, typename... Args >
using invoke_result_t = typename invoke_result<F, Args...>::type;
}
//
// apply
//
namespace invoke_hpp
{
namespace impl
{
template < typename F, typename Tuple, std::size_t... I >
constexpr decltype(auto) apply_impl(F&& f, Tuple&& args, std::index_sequence<I...>)
INVOKE_HPP_NOEXCEPT_RETURN(
invoke_hpp::invoke(
std::forward<F>(f),
std::get<I>(std::forward<Tuple>(args))...))
}
template < typename F, typename Tuple >
constexpr decltype(auto) apply(F&& f, Tuple&& args)
INVOKE_HPP_NOEXCEPT_RETURN(
impl::apply_impl(
std::forward<F>(f),
std::forward<Tuple>(args),
std::make_index_sequence<std::tuple_size<std::decay_t<Tuple>>::value>()))
}
#undef INVOKE_HPP_NOEXCEPT_RETURN
#undef INVOKE_HPP_NOEXCEPT_DECLTYPE_RETURN

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#define CATCH_CONFIG_MAIN
#include "catch.hpp"
#include "invoke.hpp"
namespace inv = invoke_hpp;
namespace
{
void simple_static_function() {
}
int simple_static_function_r() {
return 42;
}
int simple_static_function_r_with_arg(int v) {
return v;
}
const int& simple_static_function_r_with_ref_arg(const int& v) {
return v;
}
class obj_t {
public:
int value = 42;
const int value_c = 42;
void member() {
}
int member_r() {
return 42;
}
int member_r_with_arg(int v) {
return v;
}
const int& member_r_with_ref_arg(const int& v) {
return v;
}
};
}
TEST_CASE("invoke"){
SECTION("invoke_functions"){
inv::invoke(simple_static_function);
REQUIRE(inv::invoke(simple_static_function_r) == 42);
REQUIRE(inv::invoke(simple_static_function_r_with_arg, 42) == 42);
{
int v = 42;
REQUIRE(&inv::invoke(simple_static_function_r_with_ref_arg, v) == &v);
}
}
SECTION("invoke_members"){
obj_t o;
inv::invoke(&obj_t::member, o);
inv::invoke(&obj_t::member, &o);
inv::invoke(&obj_t::member, std::ref(o));
REQUIRE(inv::invoke(&obj_t::member_r, o) == 42);
REQUIRE(inv::invoke(&obj_t::member_r, &o) == 42);
REQUIRE(inv::invoke(&obj_t::member_r, std::ref(o)) == 42);
REQUIRE(inv::invoke(&obj_t::member_r_with_arg, o, 42) == 42);
REQUIRE(inv::invoke(&obj_t::member_r_with_arg, &o, 42) == 42);
REQUIRE(inv::invoke(&obj_t::member_r_with_arg, std::ref(o), 42) == 42);
{
int v = 42;
REQUIRE(&inv::invoke(&obj_t::member_r_with_ref_arg, o, std::ref(v)) == &v);
REQUIRE(&inv::invoke(&obj_t::member_r_with_ref_arg, &o, std::ref(v)) == &v);
REQUIRE(&inv::invoke(&obj_t::member_r_with_ref_arg, std::ref(o), std::ref(v)) == &v);
}
}
SECTION("invoke_member_objects"){
obj_t o;
REQUIRE(inv::invoke(&obj_t::value, o) == 42);
REQUIRE(inv::invoke(&obj_t::value, &o) == 42);
REQUIRE(inv::invoke(&obj_t::value, std::ref(o)) == 42);
REQUIRE(inv::invoke(&obj_t::value_c, o) == 42);
REQUIRE(inv::invoke(&obj_t::value_c, &o) == 42);
REQUIRE(inv::invoke(&obj_t::value_c, std::ref(o)) == 42);
}
}
TEST_CASE("invoke_result"){
SECTION("invoke_result_functions"){
static_assert(
std::is_same<
void,
inv::invoke_result_t<decltype(simple_static_function)>>::value,
"unit test fail");
static_assert(
std::is_same<
int,
inv::invoke_result_t<decltype(simple_static_function_r)>>::value,
"unit test fail");
}
SECTION("invoke_result_members"){
static_assert(
std::is_same<void,
inv::invoke_result_t<decltype(&obj_t::member), obj_t>>::value,
"unit test fail");
static_assert(
std::is_same<void,
inv::invoke_result_t<decltype(&obj_t::member), obj_t*>>::value,
"unit test fail");
static_assert(
std::is_same<void,
inv::invoke_result_t<decltype(&obj_t::member), std::reference_wrapper<obj_t>>>::value,
"unit test fail");
static_assert(
std::is_same<int,
inv::invoke_result_t<decltype(&obj_t::member_r), obj_t>>::value,
"unit test fail");
static_assert(
std::is_same<int,
inv::invoke_result_t<decltype(&obj_t::member_r), obj_t*>>::value,
"unit test fail");
static_assert(
std::is_same<int,
inv::invoke_result_t<decltype(&obj_t::member_r), std::reference_wrapper<obj_t>>>::value,
"unit test fail");
static_assert(
std::is_same<int,
inv::invoke_result_t<decltype(&obj_t::member_r_with_arg), obj_t, int>>::value,
"unit test fail");
static_assert(
std::is_same<int,
inv::invoke_result_t<decltype(&obj_t::member_r_with_arg), obj_t*, int>>::value,
"unit test fail");
static_assert(
std::is_same<int,
inv::invoke_result_t<decltype(&obj_t::member_r_with_arg), std::reference_wrapper<obj_t>, int>>::value,
"unit test fail");
}
}
TEST_CASE("apply"){
SECTION("apply_functions"){
inv::apply(simple_static_function, std::make_tuple());
REQUIRE(inv::apply(simple_static_function_r, std::make_tuple()) == 42);
REQUIRE(inv::apply(simple_static_function_r_with_arg, std::make_tuple(42)) == 42);
{
int v = 42;
REQUIRE(&inv::apply(simple_static_function_r_with_ref_arg, std::make_tuple(std::ref(v))) == &v);
}
}
SECTION("apply_members"){
obj_t o;
inv::apply(&obj_t::member, std::make_tuple(o));
inv::apply(&obj_t::member, std::make_tuple(&o));
inv::apply(&obj_t::member, std::make_tuple(std::ref(o)));
REQUIRE(inv::apply(&obj_t::member_r, std::make_tuple(o)) == 42);
REQUIRE(inv::apply(&obj_t::member_r, std::make_tuple(&o)) == 42);
REQUIRE(inv::apply(&obj_t::member_r, std::make_tuple(std::ref(o))) == 42);
REQUIRE(inv::apply(&obj_t::member_r_with_arg, std::make_tuple(o, 42)) == 42);
REQUIRE(inv::apply(&obj_t::member_r_with_arg, std::make_tuple(&o, 42)) == 42);
REQUIRE(inv::apply(&obj_t::member_r_with_arg, std::make_tuple(std::ref(o), 42)) == 42);
{
int v = 42;
REQUIRE(&inv::apply(&obj_t::member_r_with_ref_arg, std::make_tuple(o, std::ref(v))) == &v);
REQUIRE(&inv::apply(&obj_t::member_r_with_ref_arg, std::make_tuple(&o, std::ref(v))) == &v);
REQUIRE(&inv::apply(&obj_t::member_r_with_ref_arg, std::make_tuple(std::ref(o), std::ref(v))) == &v);
}
}
SECTION("apply_member_objects"){
obj_t o;
REQUIRE(inv::apply(&obj_t::value, std::make_tuple(o)) == 42);
REQUIRE(inv::apply(&obj_t::value, std::make_tuple(&o)) == 42);
REQUIRE(inv::apply(&obj_t::value, std::make_tuple(std::ref(o))) == 42);
REQUIRE(inv::apply(&obj_t::value_c, std::make_tuple(o)) == 42);
REQUIRE(inv::apply(&obj_t::value_c, std::make_tuple(&o)) == 42);
REQUIRE(inv::apply(&obj_t::value_c, std::make_tuple(std::ref(o))) == 42);
}
}