[odb-users] Persisting class instantiated from a template

[Boris Kolpackov]

Hi Balázs,

Ok, I tried to actually compile your example with this contents of
the mapping file:

typedef Result<float, 7> ResultFloatSeven;

#pragma db value(ResultFloatSeven) definition transient
#pragma db member(ResultFloatSeven::Id_) virtual(int)
#pragma db member(ResultFloatSeven::Value_) virtual(float)

The error I get is this:

mapping.hpp:7:12: error: no suitable accessor function could be automatically found for virtual data member 'Value_'
mapping.hpp:7:12: info: use '#pragma db get' to explicitly specify the accessor function or expression

Which makes sense, after looking at what you have:

valuetype getValue(int i) const { return Values[i]; }
void setValue(valuetype _value, int i) { Values[i] = _value; }

These are not suitable accessors/modifiers (ODB cannot magically know
what to pass for i). You need something like this:

valuetype getValue() const;
void setValue(valuetype)

Boris