# aot_get_val Interface

## public interface aot_get_val

Get a value from a table.

First the given key is looked up, if this fails, the value at the given position is looked up, and if this also fails, the default value is returned. Positional addressing is only valid, as long, as no value was provided by an explicit key in the list before the entry in question.

The interface to access table values looks like: call aot_get_val(val, errCode, L, thandle, key, pos, default). Position pos and key are both optional, but one of them has to be provided. If both are provided the key takes precedence over the pos, and the pos will only be tried if the access to the key fails. See for example get_table_real() for a more detailed description of the parameters.

Note that positional addressing only works intuitively as long as there have been no entries specified by keys in the table. This kind of resembles the behavior of Fortran interfaces with named or unnamed arguments, as soon as you provide a name, all following arguments have to be given by key also. Just stick to this rule for the Lua tables as well to avoid too much headache.

The reason for this is, that positional addressing in Lua refers only to the unnamed entries of the tables.

## Module Procedures

### private subroutine get_table_extdouble(val, ErrCode, L, thandle, key, pos, default)

Retrieve a extdouble precision real value from a table.

#### Arguments

Type IntentOptional AttributesName
real(kind=xdble_k), intent(out) :: val

Value of the table entry if it exists.

integer, intent(out) :: ErrCode

Error code to indicate what kind of problem might have occured.

type(flu_State) :: L
integer, intent(in), optional :: thandle

Handle to the table to look the value up in.

character(len=*), intent(in), optional :: key

Name of the entry to look for.

Key and pos are both optional, however at least one of them has to be supplied. The key takes precedence over the pos if both are given.

integer, intent(in), optional :: pos

Position of the entry to look for in the table.