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// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0(the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_SEM_CONSTANT_H_
#define SRC_TINT_SEM_CONSTANT_H_
#include <variant>
#include "src/tint/number.h"
#include "src/tint/type/type.h"
namespace tint::sem {
/// Constant is the interface to a compile-time evaluated expression value.
class Constant {
public:
/// Constructor
Constant();
/// Destructor
virtual ~Constant();
/// @returns the type of the constant
virtual const type::Type* Type() const = 0;
/// @returns the value of this Constant, if this constant is of a scalar value or abstract
/// numeric, otherwise std::monostate.
virtual std::variant<std::monostate, AInt, AFloat> Value() const = 0;
/// @returns the child constant element with the given index, or nullptr if the constant has no
/// children, or the index is out of bounds.
/// For arrays, this returns the i'th element of the array.
/// For vectors, this returns the i'th element of the vector.
/// For matrices, this returns the i'th column vector of the matrix.
/// For structures, this returns the i'th member field of the structure.
virtual const Constant* Index(size_t) const = 0;
/// @returns true if child elements of this constant are positive-zero valued.
virtual bool AllZero() const = 0;
/// @returns true if any child elements of this constant are positive-zero valued.
virtual bool AnyZero() const = 0;
/// @returns true if all child elements of this constant have the same value and type.
virtual bool AllEqual() const = 0;
/// @returns a hash of the constant.
virtual size_t Hash() const = 0;
/// @returns the value of the constant as the given scalar or abstract value.
template <typename T>
T As() const {
return std::visit(
[](auto v) {
if constexpr (std::is_same_v<decltype(v), std::monostate>) {
return T(0);
} else {
return static_cast<T>(v);
}
},
Value());
}
};
} // namespace tint::sem
#endif // SRC_TINT_SEM_CONSTANT_H_