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AK+Everywhere: Make StdLibExtras templates less wrapper-y

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This commit makes the user-facing StdLibExtras templates and utilities
arguably more nice-looking by removing the need to reach into the
wrapper structs generated by them to get the value/type needed.
The C++ standard library had to invent `_v` and `_t` variants (likely
because of backwards compat), but we don't need to cater to any codebase
except our own, so might as well have good things for free. :^)
This commit is contained in:
AnotherTest 2021-04-10 18:29:06 +04:30 • committed by Andreas Kling
parent d8d16dea95
commit a6e4482080
41 changed files with 650 additions and 662 deletions
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14
Userland/Libraries/LibWeb/Bindings/ExceptionOrUtils.h
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@ -34,12 +34,10 @@
namespace Web::Bindings {
template<typename>
struct IsExceptionOr : AK::FalseType {
};
constexpr bool IsExceptionOr = false;
template<typename T>
struct IsExceptionOr<DOM::ExceptionOr<T>> : AK::TrueType {
};
constexpr bool IsExceptionOr<DOM::ExceptionOr<T>> = true;
template<typename T>
ALWAYS_INLINE bool throw_dom_exception(JS::VM& vm, JS::GlobalObject& global_object, DOM::ExceptionOr<T>& result)
@ -51,17 +49,17 @@ ALWAYS_INLINE bool throw_dom_exception(JS::VM& vm, JS::GlobalObject& global_obje
return false;
}
template<typename F, typename T = decltype(declval<F>()()), typename Ret = typename Conditional<!IsExceptionOr<T>::value && !IsVoid<T>::value, T, JS::Value>::Type>
template<typename F, typename T = decltype(declval<F>()()), typename Ret = Conditional<!IsExceptionOr<T> && !IsVoid<T>, T, JS::Value>>
Ret throw_dom_exception_if_needed(auto&& vm, auto&& global_object, F&& fn)
{
if constexpr (IsExceptionOr<T>::value) {
if constexpr (IsExceptionOr<T>) {
auto&& result = fn();
if (throw_dom_exception(vm, global_object, result))
return JS::Value();
if constexpr (requires(T v) { v.value(); })
return result.value();
return JS::Value();
} else if constexpr (IsVoid<T>::value) {
} else if constexpr (IsVoid<T>) {
fn();
return JS::js_undefined();
} else {
@ -72,7 +70,7 @@ Ret throw_dom_exception_if_needed(auto&& vm, auto&& global_object, F&& fn)
template<typename T>
bool should_return_empty(T&& value)
{
if constexpr (IsSame<JS::Value, T>::value)
if constexpr (IsSame<JS::Value, T>)
return value.is_empty();
return false;
}