71 lines
1.4 KiB
C++
71 lines
1.4 KiB
C++
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/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bke
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*/
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#pragma once
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#include "FN_field.hh"
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namespace blender::bke {
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/* -------------------------------------------------------------------- */
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/** \name Value or Field Class
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*
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* Utility class that wraps a single value and a field, to simplify accessing both of the types.
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* \{ */
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template<typename T> struct ValueOrField {
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using Field = fn::Field<T>;
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/** Value that is used when the field is empty. */
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T value{};
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Field field;
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ValueOrField() = default;
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ValueOrField(T value) : value(std::move(value)) {}
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ValueOrField(Field field) : field(std::move(field)) {}
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bool is_field() const
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{
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return bool(this->field);
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}
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Field as_field() const
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{
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if (this->field) {
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return this->field;
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}
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return fn::make_constant_field(this->value);
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}
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T as_value() const
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{
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if (this->field) {
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/* This returns a default value when the field is not constant. */
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return fn::evaluate_constant_field(this->field);
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}
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return this->value;
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}
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friend std::ostream &operator<<(std::ostream &stream, const ValueOrField<T> &value_or_field)
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{
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if (value_or_field.field) {
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stream << "ValueOrField<T>";
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}
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else {
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stream << value_or_field.value;
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}
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return stream;
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}
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};
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/** \} */
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} // namespace blender::bke
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