mapnik::value_holder get_params_by_key1(mapnik::parameters const& p, std::string const& key)
{
parameters::const_iterator pos = p.find(key);
if (pos != p.end())
{
// will be auto-converted to proper python type by `mapnik_params_to_python`
return pos->second;
}
return mapnik::value_null();
}
mapnik::value_holder get_params_by_key2(mapnik::parameters const& p, std::string const& key)
{
parameters::const_iterator pos = p.find(key);
if (pos == p.end())
{
PyErr_SetString(PyExc_KeyError, key.c_str());
boost::python::throw_error_already_set();
}
// will be auto-converted to proper python type by `mapnik_params_to_python`
return pos->second;
}
mapnik::parameter get_params_by_index(mapnik::parameters const& p, int index)
{
if (index < 0 || static_cast<unsigned>(index) > p.size())
{
PyErr_SetString(PyExc_IndexError, "Index is out of range");
throw boost::python::error_already_set();
}
parameters::const_iterator itr = p.begin();
std::advance(itr, index);
if (itr != p.end())
{
return *itr;
}
PyErr_SetString(PyExc_IndexError, "Index is out of range");
throw boost::python::error_already_set();
}