Getting started with boost mpl with vector and push_back

问题

I've been scratching my head for far too long, I'm finding using MPL very difficult to get around and hoping somebody can get me started. Here is some partial code from a class I am developing which does not use MPL. I eventually want to implement this class all at compile time. This code probably won't make sense but I don't want all the solution in MPL - hopefully I can achieve that myself (see below for particular help).

class define_cell_type{
public:
    define_cell_type () = default;
    define_cell_type (const std::string& name_of_cell) : 
            cName {name_of_cell} {};

    double& add_variable (const std::string& Name,
            const double& init_value,
            VARIABLE declr_type = VARIABLE::STATIC_V)
    {
       vInit_val.push_back(init_value);
       vData.push_back( std::make_tuple(Name) );
            return vInit_val.back();
    };

private:
    std::string cName;
    std::vector<double> vInit_val;
    std::vector<variable_tuple> vData;
};

To get started, how do I do push_back on an mpl::vector of type double? here is an example I want to begin with similar to the function in the class I'm developing.

std::vector<double> state;
double& add_variable ( const double& init_val)
{
    state.push_back(init_val);
    return state.back();
} 

int main() {
    auto var1 = add_variable (12.2);
    auto var2 = add_variable (1.2);
    auto var2 = add_variable (6.4);
}

All I can get is something like this

typedef mpl::vector<double> state;
typedef mpl::push_back<state,double>::type types;

I would be grateful if somebody got me started, to produce a compile time vector with values pushing back the example above

来源：https://stackoverflow.com/questions/15471122/getting-started-with-boost-mpl-with-vector-and-push-back