tree 104023b0f63d797578c09f59800108faa64ae01f
parent 4dbdef708e9e3149dab25ea377c2d959300382a4
author Patrick Williams <patrick@stwcx.xyz> 1469054618 -0500
committer Patrick Williams <patrick@stwcx.xyz> 1472851770 -0500

Add type_id templates

C++ templates to assist in type conversions between C++
types and dbus types.  These templates provide a compile-time
conversion between built-in types and a C-string of dbus types.

Example:
    uint32_t a = 0;
    const char* b = "a string";
    auto t = sdbusplus::message::types::type_id(a, b);

This results in a tuple equal to std::make_tuple('u','s', '\0')', which
can be converted to a C-string("us") by tuple_to_array.

In a subsequent commit this interface will be used to do a
compile-time transformation from something like:
    msg->append(a, b)
To:
    sd_bus_message_append(msg, "us", a, b);

The type_id template can be extended to support tuples, STL
containers, and user-defined types as needed.

Change-Id: I913501b51ffc24bcf4219f4297a1e0f8ebed97b5
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>