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// Copyright 2022 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_AST_CONST_H_
#define SRC_TINT_AST_CONST_H_
#include "src/tint/ast/variable.h"
namespace tint::ast {
/// A "const" declaration is a name for a module-scoped or function-scoped creation-time value.
/// const must have a constructor expression.
///
/// Examples:
///
/// ```
/// const n = 123; // Abstract-integer typed constant
/// const pi = 3.14159265359; // Abstract-float typed constant
/// const max_f32 : f32 = 0x1.fffffep+127; // f32 typed constant
/// ```
/// @see https://www.w3.org/TR/WGSL/#creation-time-consts
class Const final : public Castable<Const, Variable> {
public:
/// Create a 'const' creation-time value variable.
/// @param pid the identifier of the program that owns this node
/// @param nid the unique node identifier
/// @param source the variable source
/// @param sym the variable symbol
/// @param type the declared variable type
/// @param constructor the constructor expression. Must not be nullptr.
/// @param attributes the variable attributes
Const(ProgramID pid,
NodeID nid,
const Source& source,
const Symbol& sym,
const ast::Type* type,
const Expression* constructor,
utils::VectorRef<const Attribute*> attributes);
/// Move constructor
Const(Const&&);
/// Destructor
~Const() override;
/// @returns "const"
const char* Kind() const override;
/// Clones this node and all transitive child nodes using the `CloneContext`
/// `ctx`.
/// @param ctx the clone context
/// @return the newly cloned node
const Const* Clone(CloneContext* ctx) const override;
};
} // namespace tint::ast
#endif // SRC_TINT_AST_CONST_H_