Michael Davidsaver
a02b6e9730
Partially replicate the '$' handling logic of dbChannelCreate() in the case where no '$' was provided.
71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
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/*
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvxs is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*
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* Author George S. McIntyre <george@level-n.com>, 2023
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*
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*/
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#ifndef PVXS_CHANNEL_H
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#define PVXS_CHANNEL_H
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#include <string>
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#include <memory>
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#include <dbChannel.h>
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namespace pvxs {
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namespace ioc {
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/**
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* This class encapsulates a shared pointer to a dbChannel but provides constructors
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* from string and dbChannel to make its use simpler. It can be used wherever a dbChannel is used.
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* As a bonus when constructed with parameters it provides an already open dbChannel.
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*/
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class Channel {
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std::shared_ptr<dbChannel> chan;
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/* Whenever chan!=nullptr, 'form' points to a string which will out-live
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* the associated dbChannel*. eg. either statically allocated, or an
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* info() tag. Value should be one of:
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* "Default",
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* "String",
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* "Binary",
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* "Decimal",
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* "Hex",
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* "Exponential",
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* "Engineering",
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* (although it could be anything...)
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*/
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const char *form = nullptr;
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public:
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Channel() = default;
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Channel(const Channel&) = default;
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Channel(Channel&&) = default;
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// This constructor calls dbChannelOpen()
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explicit Channel(const char* name);
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inline
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explicit Channel(const std::string& name)
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:Channel(name.c_str())
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{}
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Channel& operator=(const Channel&) = default;
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Channel& operator=(Channel&&) = default;
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operator dbChannel*() const {
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return chan.get();
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}
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dbChannel* operator->() const { return chan.get(); }
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dbChannel* get() const { return chan.get(); }
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const char* format() const { return form; }
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explicit operator bool() const { return chan.operator bool(); }
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};
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} // pvxs
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} // ioc
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#endif //PVXS_CHANNEL_H
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