-/* Copyright (c) 2015-2018. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2015-2021. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#define XBT_FUNCTIONAL_HPP
#include <xbt/sysdep.h>
-#include <xbt/utility.hpp>
#include <cstddef>
#include <cstdlib>
#include <cstring>
+#include <algorithm>
#include <array>
#include <exception>
#include <functional>
namespace xbt {
template <class F> class MainFunction {
-private:
F code_;
std::shared_ptr<const std::vector<std::string>> args_;
public:
- MainFunction(F code, std::vector<std::string> args)
+ MainFunction(F code, std::vector<std::string>&& args)
: code_(std::move(code)), args_(std::make_shared<const std::vector<std::string>>(std::move(args)))
{
}
{
const int argc = args_->size();
std::vector<std::string> args = *args_;
- if (not args.empty()) {
- char noarg[] = {'\0'};
- std::unique_ptr<char* []> argv(new char*[argc + 1]);
- for (int i = 0; i != argc; ++i)
- argv[i] = args[i].empty() ? noarg : &args[i].front();
- argv[argc] = nullptr;
- code_(argc, argv.get());
- } else
- code_(argc, nullptr);
+ std::vector<char*> argv(args.size() + 1); // argv[argc] is nullptr
+ std::transform(begin(args), end(args), begin(argv), [](std::string& s) { return &s.front(); });
+ code_(argc, argv.data());
}
};
-template <class F> inline std::function<void()> wrap_main(F code, std::vector<std::string> args)
+template <class F> inline std::function<void()> wrap_main(F code, std::vector<std::string>&& args)
{
return MainFunction<F>(std::move(code), std::move(args));
}
namespace bits {
template <class F, class Tuple, std::size_t... I>
-constexpr auto apply(F&& f, Tuple&& t, simgrid::xbt::index_sequence<I...>)
- -> decltype(std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...))
+constexpr auto apply(F&& f, Tuple&& t, std::index_sequence<I...>)
+ -> decltype(std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...))
{
return std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...);
}
* @endcode
**/
template <class F, class Tuple>
-constexpr auto apply(F&& f, Tuple&& t)
- -> decltype(simgrid::xbt::bits::apply(
- std::forward<F>(f),
- std::forward<Tuple>(t),
- simgrid::xbt::make_index_sequence<
- std::tuple_size<typename std::decay<Tuple>::type>::value
- >()))
+constexpr auto apply(F&& f, Tuple&& t) -> decltype(
+ simgrid::xbt::bits::apply(std::forward<F>(f), std::forward<Tuple>(t),
+ std::make_index_sequence<std::tuple_size<typename std::decay_t<Tuple>>::value>()))
{
- return simgrid::xbt::bits::apply(
- std::forward<F>(f),
- std::forward<Tuple>(t),
- simgrid::xbt::make_index_sequence<
- std::tuple_size<typename std::decay<Tuple>::type>::value
- >());
+ return simgrid::xbt::bits::apply(std::forward<F>(f), std::forward<Tuple>(t),
+ std::make_index_sequence<std::tuple_size<typename std::decay_t<Tuple>>::value>());
}
template<class T> class Task;
*/
template<class R, class... Args>
class Task<R(Args...)> {
-private:
-
// Placeholder for some class type:
struct whatever {};
// Union used for storage:
-#if 0
- typedef typename std::aligned_union<0,
- void*,
- std::pair<void(*)(),void*>,
- std::pair<void(whatever::*)(), whatever*>
- >::type TaskUnion;
-#else
- union TaskUnion {
- void* ptr;
- std::pair<void(*)(),void*> funcptr;
- std::pair<void(whatever::*)(), whatever*> memberptr;
- char any1[sizeof(std::pair<void(*)(),void*>)];
- char any2[sizeof(std::pair<void(whatever::*)(), whatever*>)];
- TaskUnion() { /* Nothing to do */}
- ~TaskUnion() { /* Nothing to do */}
- };
-#endif
+ using TaskUnion =
+ typename std::aligned_union_t<0, void*, std::pair<void (*)(), void*>, std::pair<void (whatever::*)(), whatever*>>;
// Is F suitable for small buffer optimization?
template<class F>
"SBO not working for reference_wrapper");
// Call (and possibly destroy) the function:
- typedef R (*call_function)(TaskUnion&, Args...);
+ using call_function = R (*)(TaskUnion&, Args...);
// Destroy the function (of needed):
- typedef void (*destroy_function)(TaskUnion&);
+ using destroy_function = void (*)(TaskUnion&);
// Move the function (otherwise memcpy):
- typedef void (*move_function)(TaskUnion& dest, TaskUnion& src);
+ using move_function = void (*)(TaskUnion& dest, TaskUnion& src);
// Vtable of functions for manipulating whatever is in the TaskUnion:
struct TaskVtable {
}
public:
- Task() { /* Nothing to do */}
+ Task() = default;
explicit Task(std::nullptr_t) { /* Nothing to do */}
~Task()
{
Task(Task const&) = delete;
- Task(Task&& that)
+ Task(Task&& that) noexcept
{
if (that.vtable_ && that.vtable_->move)
that.vtable_->move(buffer_, that.buffer_);
else
- std::memcpy(static_cast<void*>(&buffer_), static_cast<void*>(&that.buffer_), sizeof(buffer_));
-
- vtable_ = that.vtable_;
+ std::memcpy(&buffer_, &that.buffer_, sizeof(buffer_));
+ vtable_ = std::move(that.vtable_);
that.vtable_ = nullptr;
}
- Task& operator=(Task that)
+ Task& operator=(Task const& that) = delete;
+ Task& operator=(Task&& that) noexcept
{
this->clear();
if (that.vtable_ && that.vtable_->move)
that.vtable_->move(buffer_, that.buffer_);
else
- std::memcpy(static_cast<void*>(&buffer_), static_cast<void*>(&that.buffer_), sizeof(buffer_));
- vtable_ = that.vtable_;
+ std::memcpy(&buffer_, &that.buffer_, sizeof(buffer_));
+ vtable_ = std::move(that.vtable_);
that.vtable_ = nullptr;
return *this;
}
private:
-
- template<class F>
- typename std::enable_if<canSBO<F>()>::type
- init(F code)
+ template <class F> typename std::enable_if_t<canSBO<F>()> init(F code)
{
const static TaskVtable vtable {
// Call:
[](TaskUnion& buffer, Args... args) {
- F* src = reinterpret_cast<F*>(&buffer);
+ auto* src = reinterpret_cast<F*>(&buffer);
F code = std::move(*src);
src->~F();
+ // NOTE: std::forward<Args>(args)... is correct.
return code(std::forward<Args>(args)...);
},
// Destroy:
std::is_trivially_destructible<F>::value ?
static_cast<destroy_function>(nullptr) :
[](TaskUnion& buffer) {
- F* code = reinterpret_cast<F*>(&buffer);
+ auto* code = reinterpret_cast<F*>(&buffer);
code->~F();
},
// Move:
[](TaskUnion& dst, TaskUnion& src) {
- F* src_code = reinterpret_cast<F*>(&src);
- F* dst_code = reinterpret_cast<F*>(&dst);
+ auto* src_code = reinterpret_cast<F*>(&src);
+ auto* dst_code = reinterpret_cast<F*>(&dst);
new(dst_code) F(std::move(*src_code));
src_code->~F();
}
vtable_ = &vtable;
}
- template <class F> typename std::enable_if<not canSBO<F>()>::type init(F code)
+ template <class F> typename std::enable_if_t<not canSBO<F>()> init(F code)
{
const static TaskVtable vtable {
// Call:
[](TaskUnion& buffer, Args... args) {
// Delete F when we go out of scope:
std::unique_ptr<F> code(*reinterpret_cast<F**>(&buffer));
+ // NOTE: std::forward<Args>(args)... is correct.
return (*code)(std::forward<Args>(args)...);
},
// Destroy:
throw std::bad_function_call();
const TaskVtable* vtable = vtable_;
vtable_ = nullptr;
+ // NOTE: std::forward<Args>(args)... is correct.
+ // see C++ [func.wrap.func.inv] for an example
return vtable->call(buffer_, std::forward<Args>(args)...);
}
};
template<class F, class... Args>
class TaskImpl {
-private:
F code_;
std::tuple<Args...> args_;
- typedef decltype(simgrid::xbt::apply(std::move(code_), std::move(args_))) result_type;
+ using result_type = decltype(simgrid::xbt::apply(std::move(code_), std::move(args_)));
+
public:
TaskImpl(F code, std::tuple<Args...> args) :
code_(std::move(code)),
return Task<decltype(code(std::move(args)...))()>(std::move(task));
}
-// Deprecated
-template <class F, class... Args>
-XBT_ATTRIB_DEPRECATED_v323("Please use make_task()") auto makeTask(F code, Args... args)
- -> Task<decltype(code(std::move(args)...))()>
-{
- TaskImpl<F, Args...> task(std::move(code), std::make_tuple(std::move(args)...));
- return Task<decltype(code(std::move(args)...))()>(std::move(task));
-}
-
} // namespace xbt
} // namespace simgrid
#endif
