fmgr.h

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namespace taco {
 
 
struct FunctionCallInfo
{
    std::vector<NullableDatumRef> args;
    uint64_t                      typparam;
};
 
 
typedef Datum (*FunctionPtr)(FunctionCallInfo &fcinfo);
 
typedef std::function<Datum(FunctionCallInfo&)> FunctionInfo;
 
/* Standard parameter list for fmgr-compatible functions */
#define FMGR_FUNCTION_ARGS    ::taco::FunctionCallInfo &fcinfo_
 
#define FMGR_NARGS() (fcinfo_.args.size())
 
#define FMGR_ARG(n) (fcinfo_.args[n])
 
#define FMGR_TYPPARAM() (fcinfo_.typparam)
 
#define FMGR_RETURN_VOID()     return Datum::From(0)
 
template<class ...Args>
Datum
FunctionCall(const FunctionInfo &func, Args&& ...args) {
    FunctionCallInfo flinfo {
        .args = std::vector<NullableDatumRef>{std::forward<Args>(args)...},
        .typparam = 0
    };
 
    return func(flinfo);
}
 
/*
 * Call a function with a type parameter for the return type.
 */
template<class ...Args>
Datum
FunctionCallWithTypparam(const FunctionInfo &func,
                         uint64_t typparam,
                         Args&& ...args) {
    FunctionCallInfo flinfo {
        .args = std::vector<NullableDatumRef>{std::forward<Args>(args)...},
        .typparam = typparam,
    };
 
    return func(flinfo);
}
 
}   // namespace taco