c++ - gdb Could not find operator[]

Question

double var1, var2;
std::vector<double *> x;

var1 = 1;
var2 = 2;

x.push_back(&var1);
x.push_back(&var2);

When I debug this code in gdb and try print x[0] or *x[0] I get:

Could not find operator[].

Now if I include this line after the push_back:

x[0] = &var1;

I can access any specific elements in gdb. The same thing happens with other members such as front(), at(), etc. My understanding is that the compiler/linker includes only the member functions present in the source code and those are the ones I can use in gdb. Is there a way to include every member function of std::vector so I can access them in gdb?

Answer 1

My understanding is that the compiler/linker includes only the member functions present in the source code and those are the ones I can use in gdb.

Your understanding is incorrect / incomplete.

std::vector is a template class. Without explicit instantiation, the compiler is required to instantiate only the methods called (usually a subset of methods present in the source).

Is there a way to include every member function of std::vector so I can access them in gdb?

For a given type T, you should be able to explicitly instantiate entire vector for that T, by requesting it, e.g.:

template class std::vector<double>;