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Add monadic test function to coral::expected

This commit is contained in:
kayomn 2023-02-24 00:33:04 +00:00
parent 53ec658439
commit 2a0f821e64
1 changed files with 59 additions and 48 deletions
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107
source/coral.cpp
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@ -285,6 +285,54 @@ export void operator delete[](void * pointer, coral::allocator & allocator) {
// Wrapper types.
export namespace coral {
template<typename> struct closure;
/**
* Type-erasing view wrapper for both function and functor types that have a call operator with
* a return value matching `return_value` and arguments matching `argument_values`.
*
* **Note**: closures take no ownership of allocated memory, making it the responsibility of
* the caller to manage the lifetime of any functor assigned to it.
*/
template<typename returns, typename... arguments> struct closure<returns(arguments...)> {
using function = returns(*)(arguments...);
closure(function callable_function) {
this->dispatch = [](void const * context, arguments... dispatch_arguments) -> returns {
return (reinterpret_cast<function const *>(context))(dispatch_arguments...);
};
this->context = callable_function;
}
template<typename functor> closure(functor * callable_functor) {
this->dispatch = [](void const * context, arguments... dispatch_arguments) -> returns {
return (*reinterpret_cast<functor const*>(context))(dispatch_arguments...);
};
this->context = callable_functor;
}
closure(closure const &) = delete;
template<typename functor> closure(functor && callable_functor) {
this->dispatch = [](void const * context, arguments... dispatch_arguments) -> returns {
return (*reinterpret_cast<functor const*>(context))(dispatch_arguments...);
};
this->context = &callable_functor;
}
returns operator()(arguments const &... call_arguments) const {
return this->dispatch(this->context, call_arguments...);
}
private:
void const * context;
returns(* dispatch)(void const *, arguments...);
};
/**
* Monadic container for a single-`element` value or nothing.
*/
@ -359,6 +407,17 @@ export namespace coral {
(*reinterpret_cast<error_element *>(this->buffer)) = error;
}
/**
* Monadic function for calling `predicate` conditionally based on whether the expected is
* ok. If ok, the result of `predicate` is returned, otherwise `false` is always returned.
*
* This function may be used to chain conditional checks that depend on the expected being
* ok without creating a new local variable.
*/
bool and_test(closure<bool(value_element const &)> const & predicate) const {
return this->is_ok() && predicate(this->value());
}
/**
* Returns `true` if the optional contains a value, otherwise `false` if it holds an error.
*/
@ -420,54 +479,6 @@ export namespace coral {
u8 buffer[buffer_size + 1];
};
template<typename> struct closure;
/**
* Type-erasing view wrapper for both function and functor types that have a call operator with
* a return value matching `return_value` and arguments matching `argument_values`.
*
* **Note**: closures take no ownership of allocated memory, making it the responsibility of
* the caller to manage the lifetime of any functor assigned to it.
*/
template<typename returns, typename... arguments> struct closure<returns(arguments...)> {
using function = returns(*)(arguments...);
closure(function callable_function) {
this->dispatch = [](void const * context, arguments... dispatch_arguments) -> returns {
return (reinterpret_cast<function const *>(context))(dispatch_arguments...);
};
this->context = callable_function;
}
template<typename functor> closure(functor * callable_functor) {
this->dispatch = [](void const * context, arguments... dispatch_arguments) -> returns {
return (*reinterpret_cast<functor const*>(context))(dispatch_arguments...);
};
this->context = callable_functor;
}
closure(closure const &) = delete;
template<typename functor> closure(functor && callable_functor) {
this->dispatch = [](void const * context, arguments... dispatch_arguments) -> returns {
return (*reinterpret_cast<functor const*>(context))(dispatch_arguments...);
};
this->context = &callable_functor;
}
returns operator()(arguments const &... call_arguments) const {
return this->dispatch(this->context, call_arguments...);
}
private:
void const * context;
returns(* dispatch)(void const *, arguments...);
};
/**
* Errors that may occur while executing an opaque I/O operation via the `readable` and
* `writable` type aliases.