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AK: Check the return type in IsCallableWithArguments

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Template argument are checked to ensure that the `Out` type is equal or
convertible to the type returned by the invokee.

Compilation now fails on:
`Function<void()> f = []() -> int { return 0; };`

But this is allowed:
`Function<ErrorOr<int>()> f = []() -> int { return 0; };`
This commit is contained in:
Lucas CHOLLET 2023-01-18 18:52:14 -05:00 • committed by Andrew Kaster
parent d9f632fee7
commit 79006c03b4
4 changed files with 21 additions and 15 deletions
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8
Userland/Libraries/LibJS/SafeFunction.h
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@ -51,14 +51,14 @@ public:
template<typename CallableType>
SafeFunction(CallableType&& callable)
requires((AK::IsFunctionObject<CallableType> && IsCallableWithArguments<CallableType, In...> && !IsSame<RemoveCVReference<CallableType>, SafeFunction>))
requires((AK::IsFunctionObject<CallableType> && IsCallableWithArguments<CallableType, Out, In...> && !IsSame<RemoveCVReference<CallableType>, SafeFunction>))
{
init_with_callable(forward<CallableType>(callable), CallableKind::FunctionObject);
}
template<typename FunctionType>
SafeFunction(FunctionType f)
requires((AK::IsFunctionPointer<FunctionType> && IsCallableWithArguments<RemovePointer<FunctionType>, In...> && !IsSame<RemoveCVReference<FunctionType>, SafeFunction>))
requires((AK::IsFunctionPointer<FunctionType> && IsCallableWithArguments<RemovePointer<FunctionType>, Out, In...> && !IsSame<RemoveCVReference<FunctionType>, SafeFunction>))
{
init_with_callable(move(f), CallableKind::FunctionPointer);
}
@ -85,7 +85,7 @@ public:
template<typename CallableType>
SafeFunction& operator=(CallableType&& callable)
requires((AK::IsFunctionObject<CallableType> && IsCallableWithArguments<CallableType, In...>))
requires((AK::IsFunctionObject<CallableType> && IsCallableWithArguments<CallableType, Out, In...>))
{
clear();
init_with_callable(forward<CallableType>(callable));
@ -94,7 +94,7 @@ public:
template<typename FunctionType>
SafeFunction& operator=(FunctionType f)
requires((AK::IsFunctionPointer<FunctionType> && IsCallableWithArguments<RemovePointer<FunctionType>, In...>))
requires((AK::IsFunctionPointer<FunctionType> && IsCallableWithArguments<RemovePointer<FunctionType>, Out, In...>))
{
clear();
if (f)