MIUtilSingletonHelper.h

//===-- MIUtilSingletonHelper.h ---------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#pragma once

namespace MI
{

// In house headers:
#include "MIUtilString.h"
#include "MICmnResources.h"

//++ ============================================================================
// Details: Short cut helper function to simplify repeated initialisation of
//          MI components (singletons) required by a client module.
// Type:    Template method.
// Args:    vErrorResrcId   - (R)  The string resource ID error message identifier to place in errMsg.
//          vwrbOk          - (RW) On input True = Try to initialize MI driver module.
//                                 On output True = MI driver module initialise successfully.
//          vwrErrMsg       - (W)  MI driver module initialise error description on failure.
// Return:  MIstatus::success - Functional succeeded.
//          MIstatus::failure - Functional failed.
//--
template <typename T>
bool
ModuleInit(const MIint vErrorResrcId, bool &vwrbOk, CMIUtilString &vwrErrMsg)
{
    if (vwrbOk && !T::Instance().Initialize())
    {
        vwrbOk = MIstatus::failure;
        vwrErrMsg = CMIUtilString::Format(MIRSRC(vErrorResrcId), T::Instance().GetErrorDescription().c_str());
    }

    return vwrbOk;
}

//++ ============================================================================
// Details: Short cut helper function to simplify repeated shutdown of
//          MI components (singletons) required by a client module.
// Type:    Template method.
// Args:    vErrorResrcId   - (R)  The string resource ID error message identifier
//                                 to place in errMsg.
//          vwrbOk          - (W)  If not already false make false on module
//                                 shutdown failure.
//          vwrErrMsg       - (RW) Append to existing error description string MI
//                                 driver module initialise error description on
//                                 failure.
// Return:  True - Module shutdown succeeded.
//          False - Module shutdown failed.
//--
template <typename T>
bool
ModuleShutdown(const MIint vErrorResrcId, bool &vwrbOk, CMIUtilString &vwrErrMsg)
{
    bool bOk = MIstatus::success;

    if (!T::Instance().Shutdown())
    {
        const bool bMoreThanOneError(!vwrErrMsg.empty());
        bOk = MIstatus::failure;
        if (bMoreThanOneError)
            vwrErrMsg += ", ";
        vwrErrMsg += CMIUtilString::Format(MIRSRC(vErrorResrcId), T::Instance().GetErrorDescription().c_str());
    }

    vwrbOk = bOk ? vwrbOk : MIstatus::failure;

    return bOk;
}

} // namespace MI