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https://github.com/wpilibsuite/allwpilib
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e27d6d7bb8
This avoids a number of shutdown use-after-free races by controlling the destruction order. It also is a prerequisite to making the internal interfaces mockable for unit testing.
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2016-2018 FIRST. 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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#ifndef CSCORE_HANDLE_H_
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#define CSCORE_HANDLE_H_
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#include "cscore_c.h"
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namespace cs {
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// Handle data layout:
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// Bits 0-15: Handle index
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// Bits 16-23: Parent index (property only)
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// Bits 24-30: Type
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class Handle {
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public:
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enum Type {
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kUndefined = 0,
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kProperty = 0x40,
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kSource,
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kSink,
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kListener,
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kSinkProperty
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};
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enum { kIndexMax = 0xffff };
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Handle(CS_Handle handle) : m_handle(handle) {} // NOLINT
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operator CS_Handle() const { return m_handle; }
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Handle(int index, Type type) {
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if (index < 0) {
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m_handle = 0;
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return;
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}
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m_handle = ((static_cast<int>(type) & 0x7f) << 24) | (index & 0xffff);
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}
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Handle(int index, int property, Type type) {
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if (index < 0 || property < 0) {
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m_handle = 0;
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return;
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}
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m_handle = ((static_cast<int>(type) & 0x7f) << 24) |
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((index & 0xff) << 16) | (property & 0xffff);
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}
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int GetIndex() const { return static_cast<int>(m_handle) & 0xffff; }
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Type GetType() const {
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return static_cast<Type>((static_cast<int>(m_handle) >> 24) & 0xff);
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}
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bool IsType(Type type) const { return type == GetType(); }
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int GetTypedIndex(Type type) const { return IsType(type) ? GetIndex() : -1; }
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int GetParentIndex() const {
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return (IsType(Handle::kProperty) || IsType(Handle::kSinkProperty))
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? (static_cast<int>(m_handle) >> 16) & 0xff
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: -1;
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}
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private:
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CS_Handle m_handle;
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};
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} // namespace cs
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#endif // CSCORE_HANDLE_H_
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