Cannot iterate over sub tables of an inline table

[tsadowski]

Hello,

I use the following code to iterate over subtables of a table:

    fot = toml::find_or<toml::table>(tomlModel,"Body", toml::table{});
    for (const auto& node : fot)
    {
        try
        {
            // Get data
        }
        catch (const std::exception& e)
        {
            // Report Error
        }
    }

This works fine for the long table format...

[Body]
[Body.1]
nodes=[1, 2]

[Body.2]
nodes=[2, 3]

... but fails with the inline format.

Body = {1={nodes=[1,2]},2={nodes=[2,3]}}

The table "Body" is not found so there is nothing to iterate over.

Any hints?

Cheers,
Torsten

[ToruNiina]

Sorry, but I could not reproduce it with a simple toml file that includes Body only. It works with both files.

The internal representation of an inline table is the same as that of multiline table. So the same operation should be able to be applied.

If you have encountered this behavior in a toml file containing other tables, it may be explained by the difference of inline tables and (multiline) tables in the toml specification.

Multiline tables create a new table, so the table value is placed below root. But an inline table is defined as a key-value pair, so they are placed under the table to which the row belongs.

That means that the following toml file

[foo]
bar = "baz"
[Body.1]
nodes=[1, 2]

corresponds to the following JSON.

{
  "foo": {"bar": "baz"},
  "Body": {"1": {"nodes": [1, 2]}}
}

On the other hand, the following toml file

[foo]
bar = "baz"

Body = {1={nodes=[1,2]},2={nodes=[2,3]}} 

corresponds to the following JSON.

{
  "foo": { "bar": "baz", "Body": { "1": {"nodes": [1, 2]}, "2": {"nodes": [2, 3]} } }
}

It makes Body "not found".

[tsadowski]

Dear ToruNiina,

thanks for the explanation.

That is probably the case. The table is swallowed by the previous table when it is inlined. So std::setw(xx) is a much more important parameter than I expected.

Cheers,
Torsten