c++ - Error when compiling cpp file with g++ -


i have centos 7 install running gcc 4.8.5 , can compile cpp file named myclass. use following command compile file:

g++ -c -fpermissive  $(pkg-config --cflags --libs libavformat libavcodec libswscale libavutil) ./myclass.cpp

when run command on centos 6.7 running gcc 4.4.7, following error:

in file included ./myclass.cpp:9: ./myclass.h:70: warning: iso c++ forbids initialization of member ‘pformatctx’ ./myclass.h:70: warning: making ‘pformatctx’ static ./myclass.h:70: error: invalid in-class initialization of static data member of non-integral type ‘avformatcontext*’

in myclass.h file, have private variable:

avformatcontext   *pformatctx = null;

this error repeated of private variables initialize null.

is there explanation difference encountering between 2 centos installs?

this complete class:

    // //  myclass.h //  ffmpegplayground //  #ifndef __ffmpegplayground__myclass__ #define __ffmpegplayground__myclass__  #include <stdio.h>  #ifndef int64_c #define int64_c(c) (c ## ll) #define uint64_c(c) (c ## ull) #endif  #ifdef __cplusplus #define __stdint_macros #endif  extern "c" { #include <libavformat/avformat.h> #include <libavcodec/avcodec.h> #include <libswscale/swscale.h> #include <libavutil/frame.h> }  typedef enum {     k_status_ok = 0,     k_cant_open_file = -1,     k_no_stream_info = -2,     k_no_video_stream = -3,     k_codec_unsupported = -4,     k_cant_copy_codec = -5,     k_cant_open_codec = -6,     k_cant_allocate_frame = -7,     k_seek_failed = -8,     k_unable_to_acquire_frame = -9 } myclassstatus;  class myclass{ public:     myclass();     myclass(const char * filepath);     myclass(const char * filepath, double nscale);     ~myclass();      myclassstatus getstatus();     void seektoframe(int frame);     uint8_t* framedata();     uint8_t* nextframedata();     uint8_t* copyofnextframedata();     int getframeheight();     int getframewidth();     int getcurrentframe();     int getframedatasize();     long long getnumberofframes();  private:      bool fileisloaded;     uint8_t* createframe();     int currentframe;      void internalseektoframe(int frame);      myclassstatus status;     avformatcontext   *pformatctx = null;     int               i, videostream;     avcodeccontext    *pcodecctxorig = null;     avcodeccontext    *pcodecctx = null;     avcodec           *pcodec = null;     avframe           *pframe = null;     avframe           *pframergb = null;     int               numbytes;     uint8_t           *buffer = null;     struct swscontext *sws_ctx = null;     uint8_t           *_createdframedata = null;       double preferredscale = 1.0; };  #endif /* defined(__ffmpegplayground__myclass__) */

in-class initializers non-static members like

avformatcontext   *pformatctx = null;

are c++11 feature. gcc4.4 old that.


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