Braces error open cl code - using C++

Question

I'm following this tutorial: http://simpleopencl.blogspot.com.br/2013/06/tutorial-simple-start-with-opencl-and-c.html

and I got 3 errors:

ERROR 1) - solved

cl::Context context({default_device}); //original code

I just took off the braces and It's ok.

ERROR 2) - solved

if(program.build(default_device)!=CL_SUCCESS){

I just replace "default_device" for "all_devices" and It's ok.

ERROR 3) - not solved

sources.push_back({kernel_code.c_str(),kernel_code.length()});

I don't know what to do. Visual Studio is pointing this error message: "IntelliSense: expected an expression"

Here is the piece of the code I'm talking about:

cl::Device default_device = all_devices[0];
std::cout<< "Using device: "<<default_device.getInfo<CL_DEVICE_NAME>()<<"\n";

cl::Context context(default_device);

cl::Program::Sources sources;

// kernel calculates for each element C=A+B
std::string kernel_code=
    "void kernel simple_add(global const int* A, global const int* B, global int* C)"
    "{"
    "C[get_global_id(0)]=A[get_global_id(0)]+B[get_global_id(0)];"
    "}";
sources.push_back({kernel_code.c_str(),kernel_code.length()});

cl::Program program(context,sources);
if(program.build(all_devices)!=CL_SUCCESS){
    std::cout<<" Error building: "<<program.getBuildInfo<CL_PROGRAM_BUILD_LOG>(default_device)<<"\n";
    exit(1);
}

Answer 1

sources.push_back({kernel_code.c_str(),kernel_code.length()});

Could be written as

sources.push_back(
    {
        kernel_code.c_str(),kernel_code.length()
    }
);

In between the curly brackets its expecting an expression, something that ends with ;. Thats what your error is telling you.

Now i dont know how Sources is defined but here in these brackets

sources.push_back(...);

you have to specify a variable of whatever type sources consists of, so it can be added (pushed back)

This is an example of a std::vector<int> that consists of ints

std::vector<int> myvector;
myvector.push_back(42);

Sources probably works in a similar way