53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
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// This file is part of the "Nazara Engine - Shader module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#pragma once
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#ifndef NAZARA_SHADER_AST_EXPRESSIONVALUE_HPP
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#define NAZARA_SHADER_AST_EXPRESSIONVALUE_HPP
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#include <Nazara/Prerequisites.hpp>
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#include <Nazara/Shader/Ast/Enums.hpp>
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#include <variant>
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namespace Nz::ShaderAst
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{
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struct Expression;
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using ExpressionPtr = std::unique_ptr<Expression>;
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template<typename T>
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class ExpressionValue
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{
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public:
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ExpressionValue() = default;
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ExpressionValue(T value);
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ExpressionValue(ExpressionPtr expr);
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ExpressionValue(const ExpressionValue&) = default;
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ExpressionValue(ExpressionValue&&) noexcept = default;
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~ExpressionValue() = default;
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ExpressionPtr&& GetExpression() &&;
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const ExpressionPtr& GetExpression() const &;
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const T& GetResultingValue() const;
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bool IsExpression() const;
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bool IsResultingValue() const;
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bool HasValue() const;
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void Reset();
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ExpressionValue& operator=(const ExpressionValue&) = default;
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ExpressionValue& operator=(ExpressionValue&&) noexcept = default;
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private:
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std::variant<std::monostate, T, ExpressionPtr> m_value;
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};
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}
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#include <Nazara/Shader/Ast/ExpressionValue.inl>
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#endif // NAZARA_SHADER_AST_EXPRESSIONVALUE_HPP
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