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- Add noexcept specifiers 

- Add rvalue overloads for left_opt and right_opt
This commit is contained in:
Sebastian Messmer 2018-12-29 23:58:52 +01:00
parent e8d791c9cf
commit ffdf175981
1 changed files with 26 additions and 9 deletions
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35
src/cpp-utils/either.h
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@ -12,13 +12,13 @@ namespace cpputils {
class either final {
public:
template<class Head, class... Tail, std::enable_if_t<std::is_constructible<Left, Head, Tail...>::value && !std::is_constructible<Right, Head, Tail...>::value>* = nullptr>
either(Head&& construct_left_head_arg, Tail&&... construct_left_tail_args) /* TODO noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::forward<Head>(construct_left_head_arg), std::forward<Tail>(construct_left_tail_args)...))) */
either(Head&& construct_left_head_arg, Tail&&... construct_left_tail_args) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::forward<Head>(construct_left_head_arg), std::forward<Tail>(construct_left_tail_args)...)))
: _side(Side::left) {
_construct_left(std::forward<Head>(construct_left_head_arg), std::forward<Tail>(construct_left_tail_args)...);
}
template<class Head, class... Tail, std::enable_if_t<!std::is_constructible<Left, Head, Tail...>::value && std::is_constructible<Right, Head, Tail...>::value>* = nullptr>
either(Head&& construct_right_head_arg, Tail&&... construct_right_tail_args) /* TODO noexcept(noexcept(std::declval<either<Left, Right>>()._construct_right(std::forward<Head>(construct_right_head_arg), std::forward<Tail>(construct_right_tail_args)...))) */
either(Head&& construct_right_head_arg, Tail&&... construct_right_tail_args) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_right(std::forward<Head>(construct_right_head_arg), std::forward<Tail>(construct_right_tail_args)...)))
: _side(Side::right) {
_construct_right(std::forward<Head>(construct_right_head_arg), std::forward<Tail>(construct_right_tail_args)...);
}
@ -33,7 +33,7 @@ namespace cpputils {
}
}
either(either<Left, Right> &&rhs) /* TODO noexcept(noexcept(_construct_left(std::move(rhs._left))) && noexcept(_construct_right(std::move(rhs._right)))) */
either(either<Left, Right> &&rhs) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::move(rhs._left))) && noexcept(std::declval<either<Left, Right>>()._construct_right(std::move(rhs._right))))
: _side(rhs._side) {
if(_side == Side::left) {
_construct_left(std::move(rhs._left)); // NOLINT(cppcoreguidelines-pro-type-union-access)
@ -47,7 +47,7 @@ namespace cpputils {
}
//TODO Try allowing copy-assignment when Left/Right types are std::is_convertible
either<Left, Right> &operator=(const either<Left, Right> &rhs) /* TODO noexcept(noexcept(_construct_left(rhs._left)) && noexcept(_construct_right(rhs._right))) */ {
either<Left, Right> &operator=(const either<Left, Right> &rhs) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(rhs._left)) && noexcept(std::declval<either<Left, Right>>()._construct_right(rhs._right))) {
_destruct();
_side = rhs._side;
if (_side == Side::left) {
@ -58,7 +58,7 @@ namespace cpputils {
return *this;
}
either<Left, Right> &operator=(either<Left, Right> &&rhs) /* TODO noexcept(noexcept(_construct_left(std::move(rhs._left))) && noexcept(_construct_right(std::move(rhs._right)))) */ {
either<Left, Right> &operator=(either<Left, Right> &&rhs) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::move(rhs._left))) && noexcept(std::declval<either<Left, Right>>()._construct_right(std::move(rhs._right)))) {
_destruct();
_side = rhs._side;
if (_side == Side::left) {
@ -119,7 +119,15 @@ namespace cpputils {
return boost::none;
}
}
// left_opt()&& not offered because optional<Left&&> doesn't work
// warning: opposed to the other left_opt variants, this one already moves the content and returns by value.
boost::optional<Left> left_opt() && noexcept(noexcept(boost::optional<Left>(std::move(std::declval<either<Left, Right>>()._left)))) {
if (_side == Side::left) {
return std::move(_left); // NOLINT(cppcoreguidelines-pro-type-union-access)
} else {
return boost::none;
}
}
boost::optional<const Right&> right_opt() const& noexcept {
if (_side == Side::right) {
@ -135,7 +143,16 @@ namespace cpputils {
return boost::none;
}
}
// right_opt()&& not offered because optional<Right&&> doesn't work
// warning: opposed to the other left_opt variants, this one already moves the content and returns by value.
boost::optional<Right> right_opt() && noexcept(noexcept(boost::optional<Right>(std::move(std::declval<either<Left, Right>>()._right)))) {
if (_side == Side::right) {
return std::move(_right); // NOLINT(cppcoreguidelines-pro-type-union-access)
} else {
return boost::none;
}
}
private:
union {
@ -163,10 +180,10 @@ namespace cpputils {
}
template<typename Left_, typename Right_, typename... Args>
friend either<Left_, Right_> make_left(Args&&... args) /* TODO noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::forward<Args>(args)...)))*/;
friend either<Left_, Right_> make_left(Args&&... args) /* TODO noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::forward<Args>(args)...))) */;
template<typename Left_, typename Right_, typename... Args>
friend either<Left_, Right_> make_right(Args&&... args) /* TODO noexcept(noexcept(std::declval<either<Left, Right>>()._construct_right(std::forward<Args>(args)...)))*/;
friend either<Left_, Right_> make_right(Args&&... args) /* TODO noexcept(noexcept(std::declval<either<Left, Right>>()._construct_right(std::forward<Args>(args)...))) */;
};
template<class Left, class Right>