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Add constexpr and noexcept where possible

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This commit is contained in:
Denis Blank 2017-03-02 18:32:34 +01:00
parent 7a46100b6a
commit 705138dab5
1 changed files with 106 additions and 89 deletions
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171
include/continuable/continuable-base.hpp
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@ -143,16 +143,17 @@ template <bool Value> using bool_constant = constant<bool, Value>;
template <std::size_t Value> using size_constant = constant<std::size_t, Value>; template <std::size_t Value> using size_constant = constant<std::size_t, Value>;
template <typename T, bool Value> template <typename T, bool Value>
auto constant_of(std::integral_constant<T, Value> /*value*/ = {}) { constexpr auto constant_of(std::integral_constant<T, Value> /*value*/ = {}) {
return constant<T, Value>{}; return constant<T, Value>{};
} }
template <std::size_t Value> template <std::size_t Value>
auto size_constant_of( constexpr auto
std::integral_constant<std::size_t, Value> /*value*/ = {}) { size_constant_of(std::integral_constant<std::size_t, Value> /*value*/ = {}) {
return size_constant<Value>{}; return size_constant<Value>{};
} }
template <bool Value> template <bool Value>
auto bool_constant_of(std::integral_constant<bool, Value> /*value*/ = {}) { constexpr auto
bool_constant_of(std::integral_constant<bool, Value> /*value*/ = {}) {
return bool_constant<Value>{}; return bool_constant<Value>{};
} }
@ -177,24 +178,26 @@ template <typename> struct is_identity : std::false_type {};
template <typename... Args> template <typename... Args>
struct is_identity<identity<Args...>> : std::true_type {}; struct is_identity<identity<Args...>> : std::true_type {};
template <typename T> identity<std::decay_t<T>> identity_of(T const& /*type*/) { template <typename T>
identity<std::decay_t<T>> constexpr identity_of(T const& /*type*/) noexcept {
return {}; return {};
} }
template <typename... Args> template <typename... Args>
identity<Args...> identity_of(identity<Args...> /*type*/) { constexpr identity<Args...> identity_of(identity<Args...> /*type*/) noexcept {
return {}; return {};
} }
template <typename T> auto identity_of() { template <typename T> constexpr auto identity_of() noexcept {
return std::conditional_t<is_identity<std::decay_t<T>>::value, T, return std::conditional_t<is_identity<std::decay_t<T>>::value, T,
identity<std::decay_t<T>>>{}; identity<std::decay_t<T>>>{};
} }
template <std::size_t I, typename... T> auto get(identity<T...>) { template <std::size_t I, typename... T>
constexpr auto get(identity<T...>) noexcept {
return identity_of<at_t<I, T...>>(); return identity_of<at_t<I, T...>>();
} }
/// Helper to trick compilers about that a parameter pack is used /// Helper to trick compilers about that a parameter pack is used
template <typename... T> void unused(T&&... args) { template <typename... T> constexpr void unused(T&&... args) {
auto use = [](auto&& type) mutable { auto use = [](auto&& type) mutable {
(void)type; (void)type;
return 0; return 0;
@ -225,22 +228,24 @@ struct is_valid_impl<T, Check,
: std::common_type<std::true_type> {}; : std::common_type<std::true_type> {};
template <typename Type, typename TrueCallback> template <typename Type, typename TrueCallback>
void static_if_impl(std::true_type, Type&& type, TrueCallback&& trueCallback) { constexpr void static_if_impl(std::true_type, Type&& type,
TrueCallback&& trueCallback) {
std::forward<TrueCallback>(trueCallback)(std::forward<Type>(type)); std::forward<TrueCallback>(trueCallback)(std::forward<Type>(type));
} }
template <typename Type, typename TrueCallback> template <typename Type, typename TrueCallback>
void static_if_impl(std::false_type, Type&& /*type*/, constexpr void static_if_impl(std::false_type, Type&& /*type*/,
TrueCallback&& /*trueCallback*/) {} TrueCallback&& /*trueCallback*/) {}
template <typename Type, typename TrueCallback, typename FalseCallback> template <typename Type, typename TrueCallback, typename FalseCallback>
auto static_if_impl(std::true_type, Type&& type, TrueCallback&& trueCallback, constexpr auto static_if_impl(std::true_type, Type&& type,
TrueCallback&& trueCallback,
FalseCallback&& /*falseCallback*/) { FalseCallback&& /*falseCallback*/) {
return std::forward<TrueCallback>(trueCallback)(std::forward<Type>(type)); return std::forward<TrueCallback>(trueCallback)(std::forward<Type>(type));
} }
template <typename Type, typename TrueCallback, typename FalseCallback> template <typename Type, typename TrueCallback, typename FalseCallback>
auto static_if_impl(std::false_type, Type&& type, constexpr auto static_if_impl(std::false_type, Type&& type,
TrueCallback&& /*trueCallback*/, TrueCallback&& /*trueCallback*/,
FalseCallback&& falseCallback) { FalseCallback&& falseCallback) {
return std::forward<FalseCallback>(falseCallback)(std::forward<Type>(type)); return std::forward<FalseCallback>(falseCallback)(std::forward<Type>(type));
@ -248,40 +253,44 @@ auto static_if_impl(std::false_type, Type&& type,
} // end namespace detail } // end namespace detail
/// Returns the pack size of the given type /// Returns the pack size of the given type
template <typename... Args> auto pack_size_of(identity<std::tuple<Args...>>) { template <typename... Args>
constexpr auto pack_size_of(identity<std::tuple<Args...>>) noexcept {
return size_of_t<Args...>{}; return size_of_t<Args...>{};
} }
/// Returns the pack size of the given type /// Returns the pack size of the given type
template <typename First, typename Second> template <typename First, typename Second>
auto pack_size_of(identity<std::pair<First, Second>>) { constexpr auto pack_size_of(identity<std::pair<First, Second>>) noexcept {
return size_of_t<First, Second>{}; return size_of_t<First, Second>{};
} }
/// Returns the pack size of the given type /// Returns the pack size of the given type
template <typename... Args> auto pack_size_of(identity<Args...>) { template <typename... Args>
constexpr auto pack_size_of(identity<Args...>) noexcept {
return size_of_t<Args...>{}; return size_of_t<Args...>{};
} }
/// Returns an index sequence of the given type /// Returns an index sequence of the given type
template <typename T> auto sequenceOf(T&& sequenceable) { template <typename T> constexpr auto sequenceOf(T&& /*sequenceable*/) noexcept {
auto size = pack_size_of(std::forward<T>(sequenceable)); return std::make_index_sequence<decltype(
(void)size; pack_size_of(std::declval<T>()))::value>();
return std::make_index_sequence<decltype(size)::value>();
} }
/// Returns a check which returns a true type if the current value /// Returns a check which returns a true type if the current value
/// is below the /// is below the
template <std::size_t End> auto isLessThen(size_constant<End> end) { template <std::size_t End>
constexpr auto isLessThen(size_constant<End> end) noexcept {
return [=](auto current) { return end > current; }; return [=](auto current) { return end > current; };
} }
/// Compile-time check for validating a certain expression /// Compile-time check for validating a certain expression
template <typename T, typename Check> template <typename T, typename Check>
auto is_valid(T&& /*type*/, Check&& /*check*/) { constexpr auto is_valid(T&& /*type*/, Check&& /*check*/) noexcept {
return typename detail::is_valid_impl<T, Check>::type{}; return typename detail::is_valid_impl<T, Check>::type{};
} }
/// Creates a static functional validator object. /// Creates a static functional validator object.
template <typename Check> auto validatorOf(Check&& check) { template <typename Check>
constexpr auto validatorOf(Check&& check) noexcept(
std::is_nothrow_move_constructible<std::decay_t<Check>>::value) {
return [check = std::forward<Check>(check)](auto&& matchable) { return [check = std::forward<Check>(check)](auto&& matchable) {
return is_valid(std::forward<decltype(matchable)>(matchable), check); return is_valid(std::forward<decltype(matchable)>(matchable), check);
}; };
@ -289,7 +298,8 @@ template <typename Check> auto validatorOf(Check&& check) {
/// Invokes the callback only if the given type matches the check /// Invokes the callback only if the given type matches the check
template <typename Type, typename Check, typename TrueCallback> template <typename Type, typename Check, typename TrueCallback>
void static_if(Type&& type, Check&& check, TrueCallback&& trueCallback) { constexpr void static_if(Type&& type, Check&& check,
TrueCallback&& trueCallback) {
detail::static_if_impl(std::forward<Check>(check)(type), detail::static_if_impl(std::forward<Check>(check)(type),
std::forward<Type>(type), std::forward<Type>(type),
std::forward<TrueCallback>(trueCallback)); std::forward<TrueCallback>(trueCallback));
@ -298,7 +308,8 @@ void static_if(Type&& type, Check&& check, TrueCallback&& trueCallback) {
/// Invokes the callback only if the given type matches the check /// Invokes the callback only if the given type matches the check
template <typename Type, typename Check, typename TrueCallback, template <typename Type, typename Check, typename TrueCallback,
typename FalseCallback> typename FalseCallback>
auto static_if(Type&& type, Check&& check, TrueCallback&& trueCallback, constexpr auto static_if(Type&& type, Check&& check,
TrueCallback&& trueCallback,
FalseCallback&& falseCallback) { FalseCallback&& falseCallback) {
return detail::static_if_impl(std::forward<Check>(check)(type), return detail::static_if_impl(std::forward<Check>(check)(type),
std::forward<Type>(type), std::forward<Type>(type),
@ -309,7 +320,8 @@ auto static_if(Type&& type, Check&& check, TrueCallback&& trueCallback,
/// A compile-time while loop, which loops as long the value matches /// A compile-time while loop, which loops as long the value matches
/// the predicate. The handler shall return the next value. /// the predicate. The handler shall return the next value.
template <typename Value, typename Predicate, typename Handler> template <typename Value, typename Predicate, typename Handler>
auto static_while(Value&& value, Predicate&& predicate, Handler&& handler) { constexpr auto static_while(Value&& value, Predicate&& predicate,
Handler&& handler) {
return static_if(std::forward<Value>(value), predicate, return static_if(std::forward<Value>(value), predicate,
[&](auto&& result) mutable { [&](auto&& result) mutable {
return static_while( return static_while(
@ -323,7 +335,7 @@ auto static_while(Value&& value, Predicate&& predicate, Handler&& handler) {
} }
/// Returns a validator which checks whether the given sequenceable is empty /// Returns a validator which checks whether the given sequenceable is empty
inline auto is_empty() { inline auto is_empty() noexcept {
return [](auto const& checkable) { return [](auto const& checkable) {
return pack_size_of(checkable) == size_constant_of<0>(); return pack_size_of(checkable) == size_constant_of<0>();
}; };
@ -331,13 +343,13 @@ inline auto is_empty() {
/// Calls the given unpacker with the content of the given sequence /// Calls the given unpacker with the content of the given sequence
template <typename U, std::size_t... I> template <typename U, std::size_t... I>
auto unpack(std::integer_sequence<std::size_t, I...>, U&& unpacker) { constexpr auto unpack(std::integer_sequence<std::size_t, I...>, U&& unpacker) {
return std::forward<U>(unpacker)(size_constant_of<I>()...); return std::forward<U>(unpacker)(size_constant_of<I>()...);
} }
/// Calls the given unpacker with the content of the given sequenceable /// Calls the given unpacker with the content of the given sequenceable
template <typename F, typename U, std::size_t... I> template <typename F, typename U, std::size_t... I>
auto unpack(F&& firstSequenceable, U&& unpacker, constexpr auto unpack(F&& firstSequenceable, U&& unpacker,
std::integer_sequence<std::size_t, I...>) { std::integer_sequence<std::size_t, I...>) {
using std::get; using std::get;
(void)firstSequenceable; (void)firstSequenceable;
@ -347,8 +359,8 @@ auto unpack(F&& firstSequenceable, U&& unpacker,
/// Calls the given unpacker with the content of the given sequenceable /// Calls the given unpacker with the content of the given sequenceable
template <typename F, typename S, typename U, std::size_t... IF, template <typename F, typename S, typename U, std::size_t... IF,
std::size_t... IS> std::size_t... IS>
auto unpack(F&& firstSequenceable, S&& secondSequenceable, U&& unpacker, constexpr auto unpack(F&& firstSequenceable, S&& secondSequenceable,
std::integer_sequence<std::size_t, IF...>, U&& unpacker, std::integer_sequence<std::size_t, IF...>,
std::integer_sequence<std::size_t, IS...>) { std::integer_sequence<std::size_t, IS...>) {
using std::get; using std::get;
(void)firstSequenceable; (void)firstSequenceable;
@ -365,7 +377,8 @@ auto unpack(F&& firstSequenceable, U&& unpacker) {
} }
/// Calls the given unpacker with the content of the given sequenceables /// Calls the given unpacker with the content of the given sequenceables
template <typename F, typename S, typename U> template <typename F, typename S, typename U>
auto unpack(F&& firstSequenceable, S&& secondSequenceable, U&& unpacker) { constexpr auto unpack(F&& firstSequenceable, S&& secondSequenceable,
U&& unpacker) {
return unpack(std::forward<F>(firstSequenceable), return unpack(std::forward<F>(firstSequenceable),
std::forward<S>(secondSequenceable), std::forward<U>(unpacker), std::forward<S>(secondSequenceable), std::forward<U>(unpacker),
sequenceOf(identity_of(firstSequenceable)), sequenceOf(identity_of(firstSequenceable)),
@ -374,7 +387,8 @@ auto unpack(F&& firstSequenceable, S&& secondSequenceable, U&& unpacker) {
/// Applies the handler function to each element contained in the sequenceable /// Applies the handler function to each element contained in the sequenceable
template <typename Sequenceable, typename Handler> template <typename Sequenceable, typename Handler>
void static_for_each_in(Sequenceable&& sequenceable, Handler&& handler) { constexpr void static_for_each_in(Sequenceable&& sequenceable,
Handler&& handler) {
unpack( unpack(
std::forward<Sequenceable>(sequenceable), [&](auto&&... entries) mutable { std::forward<Sequenceable>(sequenceable), [&](auto&&... entries) mutable {
auto consume = [&](auto&& entry) mutable { auto consume = [&](auto&& entry) mutable {
@ -390,7 +404,7 @@ void static_for_each_in(Sequenceable&& sequenceable, Handler&& handler) {
/// Adds the given type at the back of the left sequenceable /// Adds the given type at the back of the left sequenceable
template <typename Left, typename Element> template <typename Left, typename Element>
auto push(Left&& left, Element&& element) { constexpr auto push(Left&& left, Element&& element) {
return unpack(std::forward<Left>(left), [&](auto&&... leftArgs) { return unpack(std::forward<Left>(left), [&](auto&&... leftArgs) {
return std::make_tuple(std::forward<decltype(leftArgs)>(leftArgs)..., return std::make_tuple(std::forward<decltype(leftArgs)>(leftArgs)...,
std::forward<Element>(element)); std::forward<Element>(element));
@ -399,44 +413,45 @@ auto push(Left&& left, Element&& element) {
/// Adds the element to the back of the identity /// Adds the element to the back of the identity
template <typename... Args, typename Element> template <typename... Args, typename Element>
auto push(identity<Args...>, identity<Element>) { constexpr auto push(identity<Args...>, identity<Element>) noexcept {
return identity<Args..., Element>{}; return identity<Args..., Element>{};
} }
/// Removes the first element from the identity /// Removes the first element from the identity
template <typename First, typename... Rest> template <typename First, typename... Rest>
auto pop_first(identity<First, Rest...>) { constexpr auto pop_first(identity<First, Rest...>) noexcept {
return identity<Rest...>{}; return identity<Rest...>{};
} }
/// Returns the merged sequence /// Returns the merged sequence
template <typename Left> auto merge(Left&& left) { template <typename Left> constexpr auto merge(Left&& left) {
return std::forward<Left>(left); return std::forward<Left>(left);
} }
/// Merges the left sequenceable with the right ones /// Merges the left sequenceable with the right ones
template <typename Left, typename Right, typename... Rest> template <typename Left, typename Right, typename... Rest>
auto merge(Left&& left, Right&& right, Rest&&... rest) { constexpr auto merge(Left&& left, Right&& right, Rest&&... rest) {
// Merge the left with the right sequenceable // Merge the left with the right sequenceable and
auto merged = // merge the result with the rest.
unpack(std::forward<Left>(left), std::forward<Right>(right), return merge(unpack(std::forward<Left>(left), std::forward<Right>(right),
[&](auto&&... args) { [&](auto&&... args) {
// Maybe use: template <template<typename...> class T, // Maybe use: template <template<typename...> class T,
// typename... Args> // typename... Args>
return std::make_tuple(std::forward<decltype(args)>(args)...); return std::make_tuple(
}); std::forward<decltype(args)>(args)...);
// And merge it with the rest }),
return merge(std::move(merged), std::forward<Rest>(rest)...); std::forward<Rest>(rest)...);
} }
/// Merges the left identity with the right ones /// Merges the left identity with the right ones
template <typename... LeftArgs, typename... RightArgs, typename... Rest> template <typename... LeftArgs, typename... RightArgs, typename... Rest>
auto merge(identity<LeftArgs...> /*left*/, identity<RightArgs...> /*right*/, constexpr auto merge(identity<LeftArgs...> /*left*/,
Rest&&... rest) { identity<RightArgs...> /*right*/, Rest&&... rest) {
return merge(identity<LeftArgs..., RightArgs...>{}, return merge(identity<LeftArgs..., RightArgs...>{},
std::forward<Rest>(rest)...); std::forward<Rest>(rest)...);
} }
/// Combines the given arguments with the given folding function /// Combines the given arguments with the given folding function
template <typename F, typename First> auto fold(F&& /*folder*/, First&& first) { template <typename F, typename First>
constexpr auto fold(F&& /*folder*/, First&& first) {
return std::forward<First>(first); return std::forward<First>(first);
} }
/// Combines the given arguments with the given folding function /// Combines the given arguments with the given folding function
@ -448,21 +463,21 @@ auto fold(F&& folder, First&& first, Second&& second, Rest&&... rest) {
} }
/// Returns a folding function using operator `&&`. /// Returns a folding function using operator `&&`.
inline auto and_folding() { inline auto and_folding() noexcept {
return [](auto&& left, auto&& right) { return [](auto&& left, auto&& right) {
return std::forward<decltype(left)>(left) && return std::forward<decltype(left)>(left) &&
std::forward<decltype(right)>(right); std::forward<decltype(right)>(right);
}; };
} }
/// Returns a folding function using operator `||`. /// Returns a folding function using operator `||`.
inline auto or_folding() { inline auto or_folding() noexcept {
return [](auto&& left, auto&& right) { return [](auto&& left, auto&& right) {
return std::forward<decltype(left)>(left) || return std::forward<decltype(left)>(left) ||
std::forward<decltype(right)>(right); std::forward<decltype(right)>(right);
}; };
} }
/// Returns a folding function using operator `>>`. /// Returns a folding function using operator `>>`.
inline auto seq_folding() { inline auto seq_folding() noexcept {
return [](auto&& left, auto&& right) { return [](auto&& left, auto&& right) {
return std::forward<decltype(left)>(left) >> return std::forward<decltype(left)>(left) >>
std::forward<decltype(right)>(right); std::forward<decltype(right)>(right);
@ -583,18 +598,18 @@ auto partial_invoke(T&& callable, Args&&... args) {
// Class for making child classes non copyable // Class for making child classes non copyable
struct non_copyable { struct non_copyable {
non_copyable() = default; constexpr non_copyable() = default;
non_copyable(non_copyable const&) = delete; non_copyable(non_copyable const&) = delete;
non_copyable(non_copyable&&) = default; constexpr non_copyable(non_copyable&&) = default;
non_copyable& operator=(non_copyable const&) = delete; non_copyable& operator=(non_copyable const&) = delete;
non_copyable& operator=(non_copyable&&) = default; non_copyable& operator=(non_copyable&&) = default;
}; };
// Class for making child classes non copyable and movable // Class for making child classes non copyable and movable
struct non_movable { struct non_movable {
non_movable() = default; constexpr non_movable() = default;
non_movable(non_movable const&) = delete; non_movable(non_movable const&) = delete;
non_movable(non_movable&&) = delete; constexpr non_movable(non_movable&&) = delete;
non_movable& operator=(non_movable const&) = delete; non_movable& operator=(non_movable const&) = delete;
non_movable& operator=(non_movable&&) = delete; non_movable& operator=(non_movable&&) = delete;
}; };
@ -604,9 +619,9 @@ struct non_movable {
/// is moved to another instance. /// is moved to another instance.
class ownership { class ownership {
public: public:
ownership() = default; constexpr ownership() = default;
explicit ownership(bool isOwning_) : is_owning(isOwning_) {} constexpr explicit ownership(bool isOwning_) : is_owning(isOwning_) {}
ownership(ownership const&) = default; constexpr ownership(ownership const&) = default;
ownership(ownership&& right) noexcept ownership(ownership&& right) noexcept
: is_owning(std::exchange(right.is_owning, false)){}; : is_owning(std::exchange(right.is_owning, false)){};
ownership& operator=(ownership const&) = default; ownership& operator=(ownership const&) = default;
@ -619,7 +634,7 @@ public:
return ownership(has_ownership() && right.has_ownership()); return ownership(has_ownership() && right.has_ownership());
} }
bool has_ownership() const noexcept { return is_owning; } constexpr bool has_ownership() const noexcept { return is_owning; }
void invalidate() noexcept { is_owning = false; } void invalidate() noexcept { is_owning = false; }
private: private:
@ -654,15 +669,15 @@ struct this_thread_executor_tag {};
/// -> void /// -> void
namespace base { namespace base {
/// Returns the signature hint of the given continuable /// Returns the signature hint of the given continuable
template <typename T> auto hint_of(util::identity<T>) { template <typename T> constexpr auto hint_of(util::identity<T>) {
static_assert(util::fail<T>::value, static_assert(util::fail<T>::value,
"Expected a continuation with an existing signature hint!"); "Expected a continuation with an existing signature hint!");
return util::identity_of<void>(); return util::identity_of<void>();
} }
/// Returns the signature hint of the given continuable /// Returns the signature hint of the given continuable
template <typename Data, typename... Args> template <typename Data, typename... Args>
auto hint_of( constexpr auto
util::identity<continuable_base<Data, signature_hint_tag<Args...>>>) { hint_of(util::identity<continuable_base<Data, signature_hint_tag<Args...>>>) {
return signature_hint_tag<Args...>{}; return signature_hint_tag<Args...>{};
} }
@ -726,18 +741,18 @@ public:
using T::operator(); using T::operator();
/// Returns the underlaying signature hint /// Returns the underlaying signature hint
Hint hint() const noexcept { return {}; } constexpr Hint hint() const noexcept { return {}; }
}; };
template <typename T, typename... Args> template <typename T, typename... Args>
auto make_invoker(T&& invoke, signature_hint_tag<Args...>) { constexpr auto make_invoker(T&& invoke, signature_hint_tag<Args...>) {
return invoker<std::decay_t<T>, signature_hint_tag<Args...>>( return invoker<std::decay_t<T>, signature_hint_tag<Args...>>(
std::forward<T>(invoke)); std::forward<T>(invoke));
} }
/// - continuable<?...> -> result(nextCallback); /// - continuable<?...> -> result(nextCallback);
template <typename Data, typename Annotation> template <typename Data, typename Annotation>
auto invokerOf(util::identity<continuable_base<Data, Annotation>>) { constexpr auto invokerOf(util::identity<continuable_base<Data, Annotation>>) {
/// Get the hint of the unwrapped returned continuable /// Get the hint of the unwrapped returned continuable
using Type = decltype(attorney::materialize( using Type = decltype(attorney::materialize(
std::declval<continuable_base<Data, Annotation>>())); std::declval<continuable_base<Data, Annotation>>()));
@ -796,14 +811,14 @@ inline auto sequencedUnpackInvoker() {
// - std::pair<?, ?> -> nextCallback(?, ?) // - std::pair<?, ?> -> nextCallback(?, ?)
template <typename First, typename Second> template <typename First, typename Second>
auto invokerOf(util::identity<std::pair<First, Second>>) { constexpr auto invokerOf(util::identity<std::pair<First, Second>>) {
return make_invoker(sequencedUnpackInvoker(), return make_invoker(sequencedUnpackInvoker(),
util::identity<First, Second>{}); util::identity<First, Second>{});
} }
// - std::tuple<?...> -> nextCallback(?...) // - std::tuple<?...> -> nextCallback(?...)
template <typename... Args> template <typename... Args>
auto invokerOf(util::identity<std::tuple<Args...>>) { constexpr auto invokerOf(util::identity<std::tuple<Args...>>) {
return make_invoker(sequencedUnpackInvoker(), util::identity<Args...>{}); return make_invoker(sequencedUnpackInvoker(), util::identity<Args...>{});
} }
} // end namespace decoration } // end namespace decoration
@ -890,7 +905,7 @@ void invoke_proxy(signature_hint_tag<Args...>, Continuation&& continuation,
/// Returns the next hint when the callback is invoked with the given hint /// Returns the next hint when the callback is invoked with the given hint
template <typename T, typename... Args> template <typename T, typename... Args>
auto next_hint_of(util::identity<T> /*callback*/, constexpr auto next_hint_of(util::identity<T> /*callback*/,
signature_hint_tag<Args...> /*current*/) { signature_hint_tag<Args...> /*current*/) {
auto result = auto result =
util::identity_of<decltype(std::declval<T>()(std::declval<Args>()...))>(); util::identity_of<decltype(std::declval<T>()(std::declval<Args>()...))>();
@ -989,12 +1004,12 @@ template <> struct is_strategy<strategy_any_tag> : std::true_type {};
namespace annotating { namespace annotating {
namespace detail { namespace detail {
/// Void hints are equal to an empty signature /// Void hints are equal to an empty signature
inline auto make_hint_of(util::identity<void>) { constexpr auto make_hint_of(util::identity<void>) noexcept {
return signature_hint_tag<>{}; return signature_hint_tag<>{};
} }
/// All other hints are the obvious hints... /// All other hints are the obvious hints...
template <typename... HintArgs> template <typename... HintArgs>
auto make_hint_of(util::identity<HintArgs...> args) { constexpr auto make_hint_of(util::identity<HintArgs...> args) noexcept {
return args; // Identity is equal to signature_hint_tag return args; // Identity is equal to signature_hint_tag
} }
} // end namespace detail } // end namespace detail
@ -1015,7 +1030,8 @@ auto make_hint_of(util::identity<HintArgs...> args) {
/// - absent_signature_hint_tag /// - absent_signature_hint_tag
/// ///
template <typename T, typename... HintArgs> template <typename T, typename... HintArgs>
auto extract(util::identity<T> /*type*/, util::identity<HintArgs...> hint) { constexpr auto extract(util::identity<T> /*type*/,
util::identity<HintArgs...> hint) {
return util::static_if(hint, util::is_empty(), return util::static_if(hint, util::is_empty(),
[=](auto /*hint*/) { [=](auto /*hint*/) {
/// When the arguments are the hint is absent /// When the arguments are the hint is absent
@ -1030,7 +1046,7 @@ auto extract(util::identity<T> /*type*/, util::identity<HintArgs...> hint) {
namespace detail { namespace detail {
template <std::size_t Pos, typename T> template <std::size_t Pos, typename T>
void assign(util::size_constant<Pos> /*pos*/, T& /*storage*/) { constexpr void assign(util::size_constant<Pos> /*pos*/, T& /*storage*/) {
// ... // ...
} }
template <std::size_t Pos, typename T, typename Current, typename... Args> template <std::size_t Pos, typename T, typename Current, typename... Args>
@ -1251,10 +1267,10 @@ auto make_any_result_submitter(Callback&& callback) {
} }
template <typename T, typename... Args> template <typename T, typename... Args>
T first_of(util::identity<T, Args...>) noexcept; constexpr T first_of(util::identity<T, Args...>) noexcept;
template <typename Signature, typename... Args> template <typename Signature, typename... Args>
auto common_result_of(Signature signature, signature_hint_tag<>, constexpr auto common_result_of(Signature signature, signature_hint_tag<>,
Args... /*args*/) { Args... /*args*/) {
/// Assert that the other signatures are empty too which means all signatures /// Assert that the other signatures are empty too which means all signatures
/// had the same size. /// had the same size.
@ -1271,7 +1287,8 @@ auto common_result_of(Signature signature, signature_hint_tag<>,
/// c1 with `void(int)` and c22 with `void(float)`, the common result shared /// c1 with `void(int)` and c22 with `void(float)`, the common result shared
/// between both continuations is `void(int)`. /// between both continuations is `void(int)`.
template <typename Signature, typename First, typename... Args> template <typename Signature, typename First, typename... Args>
auto common_result_of(Signature signature, First first, Args... args) { constexpr auto common_result_of(Signature signature, First first,
Args... args) {
auto common = auto common =
util::identity<std::common_type_t<decltype(first_of(first)), util::identity<std::common_type_t<decltype(first_of(first)),
decltype(first_of(args))...>>{}; decltype(first_of(args))...>>{};
@ -1366,9 +1383,9 @@ class promise_callback<signature_hint_tag<Args...>>
typename future_trait<Args...>::promise_t promise_; typename future_trait<Args...>::promise_t promise_;
public: public:
promise_callback() = default; constexpr promise_callback() = default;
promise_callback(promise_callback const&) = delete; promise_callback(promise_callback const&) = delete;
promise_callback(promise_callback&&) = default; constexpr promise_callback(promise_callback&&) = default;
promise_callback& operator=(promise_callback const&) = delete; promise_callback& operator=(promise_callback const&) = delete;
promise_callback& operator=(promise_callback&&) = delete; promise_callback& operator=(promise_callback&&) = delete;