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/*========================== begin_copyright_notice ============================
Copyright (C) 2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//===----------------------------------------------------------------------===//
//
// Similar to std::optional but simple and mostly intended for simple types,
// this is useful in interfacing with the UMD. See Array.h comments for
// rationale.
//
//===----------------------------------------------------------------------===//
#pragma once
#include <type_traits>
#include <assert.h>
namespace Interface {
template <typename T>
class Optional
{
static_assert(std::is_arithmetic_v<T>, "simple types for now!");
T Val;
bool Valid = false;
public:
Optional() : Valid(false) {}
Optional(T V) : Val(V), Valid(true) {}
Optional(const Optional& RHS) = default;
Optional& operator=(const Optional& RHS) = default;
Optional(Optional&& RHS) = default;
Optional& operator=(Optional&& RHS) = default;
bool has_value() const { return Valid; }
explicit operator bool() const { return has_value(); }
const T* operator->() const
{
assert(has_value());
return &Val;
}
T* operator->()
{
assert(has_value());
return &Val;
}
const T& operator*() const
{
assert(has_value());
return Val;
}
T& operator*()
{
assert(has_value());
return Val;
}
void reset()
{
Valid = false;
}
};
} // Interface
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