mirror of
https://github.com/wpilibsuite/allwpilib
synced 2026-06-22 01:11:42 +00:00
e4a918850f
Fixed undefined behavior when returning nullptr for T = std::string. Also added support for smart pointers. T = std::unique_ptr<U> returns U* and T = std::shared_ptr<U> returns std::weak_ptr<U>.
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) FIRST 2011-2017. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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#pragma once
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#include <memory>
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#include <string>
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#include "SmartDashboard/SendableChooserBase.h"
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#include "llvm/StringMap.h"
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#include "llvm/StringRef.h"
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#include "tables/ITable.h"
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namespace frc {
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/**
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* The {@link SendableChooser} class is a useful tool for presenting a selection
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* of options to the {@link SmartDashboard}.
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*
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* <p>For instance, you may wish to be able to select between multiple
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* autonomous modes. You can do this by putting every possible {@link Command}
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* you want to run as an autonomous into a {@link SendableChooser} and then put
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* it into the {@link SmartDashboard} to have a list of options appear on the
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* laptop. Once autonomous starts, simply ask the {@link SendableChooser} what
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* the selected value is.</p>
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*
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* @tparam T The type of values to be stored
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* @see SmartDashboard
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*/
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template <class T>
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class SendableChooser : public SendableChooserBase {
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llvm::StringMap<T> m_choices;
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template <class U>
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static U _unwrap_smart_ptr(const U& value);
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template <class U>
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static U* _unwrap_smart_ptr(const std::unique_ptr<U>& value);
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template <class U>
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static std::weak_ptr<U> _unwrap_smart_ptr(const std::shared_ptr<U>& value);
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public:
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virtual ~SendableChooser() = default;
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void AddObject(llvm::StringRef name, T object);
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void AddDefault(llvm::StringRef name, T object);
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auto GetSelected() -> decltype(_unwrap_smart_ptr(m_choices[""]));
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void InitTable(std::shared_ptr<ITable> subtable) override;
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};
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} // namespace frc
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#include "SendableChooser.inc"
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