没有匹配的 function 调用 'std::vector::push_back(<brace-enclosed initializer list> )'</brace-enclosed>

Question

I am quite new to object oriented programming. I'm trying to modularize a code in a class format in order to make things easy to understand and make the code extendable.

I am stuck with this error:

   Description  Resource    Path    Location    Type
make: *** [src/interface.o] Error 1 Emulation-SW    /virtualization_proj        C/C++ Problem
make: *** Waiting for unfinished jobs....   Emulation-SW    /virtualization_proj        C/C++ Problem
no matching function for call to ‘std::vector<std::vector<unsigned char, std::allocator<unsigned char> >, std::allocator<std::vector<unsigned char, std::allocator<unsigned char> > > >::push_back(<brace-enclosed initializer list>)’  interface.h /virtualization_proj/src    line 58 C/C++ Problem
recipe for target 'src/interface.o' failed  makefile    /virtualization_proj/Emulation-SW   line 57 C/C++ Problem

The error looks in the IDE as below:

Can someone help in resolving this error?

class INTERFACE{
   
    public:
    
    std::vector<cl::Device> devices;
    cl::Device device;
    std::vector<cl::Platform> platforms;
    cl::Context context;
    cl::CommandQueue q;

    cl::Program::Binaries bins;
    char *buf;
    unsigned nb;
    
    cl::Program program;

    int push_xclbinFile_to_FPGA(){
      bins.push_back({buf,nb});  // Push_back function is not getting recognized
      devices.resize(1);
      program= cl::Program(context, devices, bins);
      return 1;

    }
 
};

Edit

To make the question more clear, these lines work completely fine when I execute them from the main() function as below. I hope this will clarify the question a little more.

Edit

The main file code is as below:

int main(int argc, char* argv[]) {


    // Compute the size of array in bytes
     INTERFACE i_obj;
     size_t size_in_bytes= i_obj.compute_size_in_bytes();

    // Finding the device
     int device_found= i_obj.finding_platform();
     if(device_found==0){
         std::cout<< "Device found successfully" << std::endl;
     }

    // Creating Context and Command Queue for selected device
    cl::Context context(i_obj.devices);
    cl::CommandQueue q(context, i_obj.device, CL_QUEUE_PROFILING_ENABLE);
    i_obj.context= context;
    i_obj.q= q;



     VMGR *vm=new VMGR();
     vm->initialize_mq();             // Creating the Queue1


    while(1){


    std::vector<std::string> numbers = vm->run();

    int st=i_obj.buffer_values();


        //setting input data

        if (numbers.size()!=0){



            if(numbers[2]=="SUB"){
//
                    // Read the xclbin file
                  int status_xclbin_read= i_obj.reading_the_xclbinFile(vm);

                 //  Process the read Data

                  i_obj.bins.push_back({i_obj.buf,i_obj.nb});

                  (i_obj.devices).resize(1);



                  // Push the xclbin file into the FPGA
              cl::Program program(i_obj.context, i_obj.devices, i_obj.bins);


                 // This call will get the kernel object from program. A kernel is an
                    // OpenCL function that is executed on the FPGA.
                  i_obj.krnl_vector_sub= cl::Kernel(program,"krnl_vsub");


                int narg=0;

                 // set the kernel Arguments
                i_obj.krnl_vector_sub.setArg(narg++,i_obj.buffer_a);
                i_obj.krnl_vector_sub.setArg(narg++,i_obj.buffer_b);

                i_obj.krnl_vector_sub.setArg(narg++,i_obj.buffer_result);

                i_obj.krnl_vector_sub.setArg(narg++,api::DATA_SIZE);
                //We then need to map our OpenCL buffers to get the pointers
                i_obj.ptr_a = (int *) (i_obj.q).enqueueMapBuffer (i_obj.buffer_a , CL_TRUE , CL_MAP_WRITE , 0, size_in_bytes);
                i_obj.ptr_b = (int *) (i_obj.q).enqueueMapBuffer (i_obj.buffer_b , CL_TRUE , CL_MAP_WRITE , 0, size_in_bytes);

                i_obj.ptr_result = (int *) (i_obj.q).enqueueMapBuffer (i_obj.buffer_result , CL_TRUE , CL_MAP_READ , 0, size_in_bytes);

                i_obj.bins.clear();




            }

        (i_obj.q).finish();




           


    }

    return 0;


}

Answer 1

bins.push_back({buf,nb}) makes no sense. Because of that the compiler can't figure out what type {buf,nb} is supposed to be.

Based on your error message, bins is a std::vector<std::vector<unsigned char>> , which means bins.push_back needs you to pass it a std::vector<unsigned char> . {buf,nb} can't be converted to a std::vector<unsigned char> though, since neither buf , nor nb are unsigned char s (one is a char* and the other an unsigned int ).

Note that the documentation for the relevant cl::Program constructor appears to be incorrect. It is documented to accept a vector of (bin, size) pairs, but it does not. It just accepts a vector of vectors containing binary data. std::vector knows its own size, so that doesn't need to be passed separately. Looking at the code it appears that documentation was once correct, but the interface has changed based on the preprocessor conditionals in that constructor.