[C++源码] 返回值封装-Status-fbxsdk

妖狐艹你老母 2022-10-12 12:56 160阅读 0赞

构建自己的状态类型是很有必要的，可以参照fbxsdk中的代码

/**************************************************************************************** Copyright (C) 2016 Autodesk, Inc. All rights reserved. Use of this software is subject to the terms of the Autodesk license agreement provided at the time of installation or download, or which otherwise accompanies this software in either electronic or hard copy form. ****************************************************************************************/
    
    //! \file fbxstatus.h
    #ifndef _FBXSDK_CORE_BASE_STATUS_H_
    #define _FBXSDK_CORE_BASE_STATUS_H_
    
    #include <fbxsdk/fbxsdk_def.h>
    
    #include <fbxsdk/core/base/fbxstring.h>
    
    #include <fbxsdk/fbxsdk_nsbegin.h>
    
    /** This class facilitates the testing/reporting of errors. It encapsulates the * status code and the internal FBXSDK error code as returned by the API functions. * \nosubgrouping */
    class FBXSDK_DLL FbxStatus
    { 
    public:
    
    
        //! Available status codes.
        enum EStatusCode {         
            eSuccess = 0,                           //!< Operation was successful
            eFailure,                               //!< Operation failed
            eInsufficientMemory,                    //!< Operation failed due to insufficient memory
            eInvalidParameter,                      //!< An invalid parameter was provided
            eIndexOutOfRange,                       //!< Index value outside the valid range
            ePasswordError,                         //!< Operation on FBX file password failed
            eInvalidFileVersion,                    //!< File version not supported (anymore or yet)
            eInvalidFile,                           //!< Operation on the file access failed
    		eSceneCheckFail							//!< Scene validation failure
        };
    
        //! Default constructor.
        FbxStatus();
    
        FbxStatus(EStatusCode pCode);
        FbxStatus(const FbxStatus& rhs);
    
        FbxStatus&      operator=(const FbxStatus& rhs);
    
        /** Equivalence operator. * \param rhs Status object to compare. * \return \c True if all the members of \e rhs are equal to this instance members and \c False otherwise. */
        bool            operator==(const FbxStatus& rhs)    const   {  return (mCode == rhs.mCode); }
        /** Equivalence operator. * \param pCode Status code to compare. * \return \c True if the code member of this instance equals \e pCode and \c False otherwise. */
        bool            operator==(const EStatusCode pCode) const   {  return (mCode == pCode); }
        /** Non-Equivalence operator. * \param rhs Status object to compare. * \return \c True if at least one member of \e rhs is not equal to this instance member and \c True otherwise. */
        bool            operator!=(const FbxStatus& rhs)    const   {  return (mCode != rhs.mCode); }
        /** Non-Equivalence operator. * \param rhs Status code to compare. * \return \c True if the code member of this instance equals \e rhs and \c False otherwise. */
        bool            operator!=(const EStatusCode rhs)   const   {  return (mCode != rhs); }
    
        /** The conversion operator that converts a FbxStatus object to bool. * The result it returns will be \c True if the FbxStatus does not contain * an error, and \c False if it does. */
        operator        bool() const    {  return mCode==eSuccess; }
    
        /** Determines whether there is an error. * \return \c True if an error occured and \c False if the operation was sucessful. */
        bool            Error() const   {  return !this->operator bool(); }
    
        //! Clear error code and message from the instance. After this call, it will behave as if it contained eSuccess.
        void            Clear();
    
        //! Retrieve the type of error that occurred, as specified in the enumeration.
        EStatusCode     GetCode() const {  return mCode; }
    
        /** Change the current code of the instance. * \param rhs New code value. */
        void            SetCode(const EStatusCode rhs);
    
        /** Change the current code of the instance. * \param rhs New code value. * \param pErrorMsg Optional error description string. This string can have formatting characters * The function will use the vsnprintf function to assemble the final string * using an internal buffer of 4096 characters. */
        void            SetCode(const EStatusCode rhs, const char* pErrorMsg, ...);
    
        //! Get the error message string corresponding to the current code.
        const char*     GetErrorString() const;
    
    /***************************************************************************************************************************** ** WARNING! Anything beyond these lines is for internal use, may not be documented and is subject to change without notice! ** *****************************************************************************************************************************/
    #ifndef DOXYGEN_SHOULD_SKIP_THIS
    
    private:
        EStatusCode     mCode;
        FbxString       mErrorString;
    
    #endif /* !DOXYGEN_SHOULD_SKIP_THIS */
    };
    
    #include <fbxsdk/fbxsdk_nsend.h>
    
    #endif /* _FBXSDK_CORE_BASE_STATUS_H_ */