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Fix and add test cases

This commit is contained in:
Sebastian Messmer 2018-12-24 18:15:08 +01:00
parent 0444b809a2
commit 59d6a10d28
2 changed files with 1224 additions and 116 deletions
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65
src/cpp-utils/either.h
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@ -11,25 +11,16 @@ namespace cpputils {
template<class Left, class Right>
class either final {
public:
//TODO Try allowing construction with any type that std::is_convertible to Left or Right.
either(const Left &left) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(left)))
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)...))) */
: _side(Side::left) {
_construct_left(left);
_construct_left(std::forward<Head>(construct_left_head_arg), std::forward<Tail>(construct_left_tail_args)...);
}
either(Left &&left) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::move(left))))
: _side(Side::left) {
_construct_left(std::move(left));
}
either(const Right &right) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_right(right)))
: _side(Side::right) {
_construct_right(right);
}
either(Right &&right) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_right(std::move(right))))
: _side(Side::right) {
_construct_right(std::move(right));
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)...))) */
: _side(Side::right) {
_construct_right(std::forward<Head>(construct_right_head_arg), std::forward<Tail>(construct_right_tail_args)...);
}
//TODO Try allowing copy-construction when Left/Right types are std::is_convertible
@ -42,7 +33,7 @@ namespace cpputils {
}
}
either(either<Left, Right> &&rhs) noexcept(noexcept(_construct_left(std::move(rhs._left))) && noexcept(_construct_right(std::move(rhs._right))))
either(either<Left, Right> &&rhs) /* TODO noexcept(noexcept(_construct_left(std::move(rhs._left))) && noexcept(_construct_right(std::move(rhs._right)))) */
: _side(rhs._side) {
if(_side == Side::left) {
_construct_left(std::move(rhs._left));
@ -56,7 +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) noexcept(noexcept(_construct_left(rhs._left)) && noexcept(_construct_right(rhs._right))) {
either<Left, Right> &operator=(const either<Left, Right> &rhs) /* TODO noexcept(noexcept(_construct_left(rhs._left)) && noexcept(_construct_right(rhs._right))) */ {
_destruct();
_side = rhs._side;
if (_side == Side::left) {
@ -67,7 +58,7 @@ namespace cpputils {
return *this;
}
either<Left, Right> &operator=(either<Left, Right> &&rhs) noexcept(noexcept(_construct_left(std::move(rhs._left))) && noexcept(_construct_right(std::move(rhs._right)))) {
either<Left, Right> &operator=(either<Left, Right> &&rhs) /* TODO noexcept(noexcept(_construct_left(std::move(rhs._left))) && noexcept(_construct_right(std::move(rhs._right)))) */ {
_destruct();
_side = rhs._side;
if (_side == Side::left) {
@ -124,13 +115,7 @@ namespace cpputils {
return boost::none;
}
}
boost::optional<Left> left_opt() && noexcept {
if (_side == Side::left) {
return std::move(_left);
} else {
return boost::none;
}
}
// left_opt()&& not offered because optional<Left&&> doesn't work
boost::optional<const Right&> right_opt() const& noexcept {
if (_side == Side::right) {
@ -146,13 +131,7 @@ namespace cpputils {
return boost::none;
}
}
boost::optional<Right> right_opt() && noexcept {
if (_side == Side::right) {
return std::move(_right);
} else {
return boost::none;
}
}
// right_opt()&& not offered because optional<Right&&> doesn't work
private:
union {
@ -179,19 +158,15 @@ namespace cpputils {
}
}
template<class... Args> static constexpr bool left_noexcept_constructible(Args&&... args) {
return noexcept(_construct_left(std::forward<Args>(args)...));
}
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)...)))*/;
template<typename Left_, typename Right_, typename... Args>
friend either<Left_, Right_> make_left(Args&&... args) 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) 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>
bool operator==(const either<Left, Right> &lhs, const either<Left, Right> &rhs) noexcept(noexcept(std::declval<Left>() == std::declval<Left>()) && noexcept(std::declval<Right>() == std::declval<Right>())) {
inline bool operator==(const either<Left, Right> &lhs, const either<Left, Right> &rhs) noexcept(noexcept(std::declval<Left>() == std::declval<Left>()) && noexcept(std::declval<Right>() == std::declval<Right>())) {
if (lhs.is_left() != rhs.is_left()) {
return false;
}
@ -203,12 +178,12 @@ namespace cpputils {
}
template<class Left, class Right>
bool operator!=(const either<Left, Right> &lhs, const either<Left, Right> &rhs) noexcept(noexcept(operator==(lhs, rhs))) {
inline bool operator!=(const either<Left, Right> &lhs, const either<Left, Right> &rhs) noexcept(noexcept(operator==(lhs, rhs))) {
return !operator==(lhs, rhs);
}
template<class Left, class Right>
std::ostream &operator<<(std::ostream &stream, const either<Left, Right> &value) {
inline std::ostream &operator<<(std::ostream &stream, const either<Left, Right> &value) {
if (value.is_left()) {
stream << "Left(" << value.left() << ")";
} else {
@ -218,14 +193,14 @@ namespace cpputils {
}
template<typename Left, typename Right, typename... Args>
either<Left, Right> make_left(Args&&... args) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::forward<Args>(args)...))) {
inline either<Left, Right> make_left(Args&&... args) /* TODO noexcept(noexcept(std::declval<either<Left, Right>>()._construct_left(std::forward<Args>(args)...))) */ {
either<Left, Right> result(either<Left, Right>::Side::left);
result._construct_left(std::forward<Args>(args)...);
return result;
}
template<typename Left, typename Right, typename... Args>
either<Left, Right> make_right(Args&&... args) noexcept(noexcept(std::declval<either<Left, Right>>()._construct_right(std::forward<Args>(args)...))) {
inline either<Left, Right> make_right(Args&&... args) /* TODO noexcept(noexcept(std::declval<either<Left, Right>>()._construct_right(std::forward<Args>(args)...))) */ {
either<Left, Right> result(either<Left, Right>::Side::right);
result._construct_right(std::forward<Args>(args)...);
return result;

1275
test/cpp-utils/either_test.cpp
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