Re: How to "check" for a boolean function argument through the C api

["RJP Computing" <rjpcomputing@...>]

On 7/27/07, Etan Reisner <deryni@unreliablesource.net> wrote:

Both lua_toboolean and lua_isboolean exist and can be used to do what you
want.

I have no real idea why there is no luaL_checkboolean other than to guess
that perhaps (like table copying) there wasn't a clear ability to decide
what it should do exactly. Since both true/false only and the lua
normative definition of true/false are valid.

        -Etan

I found a solution to both the optional arguments and the "check" in luaxx. Here is the code for completeness.

bool as( bool default_bool, int index = -1 )

{

    if ( lua_isboolean( L, index ) )

        return lua_toboolean( L, index );

    else

        return default_bool;

}


state& to( bool& boolean, int index = -1 )

{

    if ( lua_isboolean( L, index ) )

        boolean = lua_toboolean( L, index );

    else

        throw bad_conversion( "Cannot convert non 'boolean' value to bool" );


    return *this;

}


I still would like to know why they are missing from the C api.
-- 
Regards,
Ryan
RJP Computing