jld immutables

h5dump test.jld

HDF5 "test.jld" {
GROUP "/" {
   DATASET "ComplexImmutable" {
      DATATYPE  "/_types/3"
      DATASPACE  SCALAR
      DATA {
      (0): {
            {
               1,
               2.2
            },
            {
               3,
               4.4,
               5
            }
         }
      }
   }
   DATASET "_require" {
      DATATYPE  H5T_STRING {
         STRSIZE H5T_VARIABLE;
         STRPAD H5T_STR_NULLTERM;
         CSET H5T_CSET_UTF8;
         CTYPE H5T_C_S1;
      }
      DATASPACE  NULL
      DATA {
      }
      ATTRIBUTE "dims" {
         DATATYPE  H5T_STD_I64LE
         DATASPACE  SIMPLE { ( 1 ) / ( 1 ) }
         DATA {
         (0): 0
         }
      }
      ATTRIBUTE "julia type" {
         DATATYPE  H5T_STRING {
            STRSIZE 53;
            STRPAD H5T_STR_NULLTERM;
            CSET H5T_CSET_ASCII;
            CTYPE H5T_C_S1;
         }
         DATASPACE  SCALAR
         DATA {
         (0): "Core.Array{Union(Core.ASCIIString,Core.UTF8String),1}"
         }
      }
   }
   GROUP "_types" {
      DATATYPE "1" H5T_COMPOUND {
         H5T_STD_I8LE "a";
         H5T_IEEE_F64LE "b";
      }
         ATTRIBUTE "julia type" {
            DATATYPE  H5T_STRING {
               STRSIZE 20;
               STRPAD H5T_STR_NULLTERM;
               CSET H5T_CSET_ASCII;
               CTYPE H5T_C_S1;
            }
            DATASPACE  SCALAR
            DATA {
            (0): "Main.SimpleImmutable"
            }
         }
      DATATYPE "2" H5T_COMPOUND {
         H5T_STD_I64LE "1";
         H5T_IEEE_F64LE "2";
         H5T_STD_U8LE "3";
      }
         ATTRIBUTE "julia type" {
            DATATYPE  H5T_STRING {
               STRSIZE 36;
               STRPAD H5T_STR_NULLTERM;
               CSET H5T_CSET_ASCII;
               CTYPE H5T_C_S1;
            }
            DATASPACE  SCALAR
            DATA {
            (0): "(Core.Int64,Core.Float64,Core.Uint8)"
            }
         }
      DATATYPE "3" H5T_COMPOUND {
         H5T_COMPOUND {
            H5T_STD_I8LE "a";
            H5T_IEEE_F64LE "b";
         } "a";
         H5T_COMPOUND {
            H5T_STD_I64LE "1";
            H5T_IEEE_F64LE "2";
            H5T_STD_U8LE "3";
         } "b";
      }
         ATTRIBUTE "julia type" {
            DATATYPE  H5T_STRING {
               STRSIZE 21;
               STRPAD H5T_STR_NULLTERM;
               CSET H5T_CSET_ASCII;
               CTYPE H5T_C_S1;
            }
            DATASPACE  SCALAR
            DATA {
            (0): "Main.ComplexImmutable"
            }
         }
   }
}
}

test.jl

using HDF5, JLD

immutable SimpleImmutable
    a::Int8
    b::Float64
end
immutable ComplexImmutable
    a::SimpleImmutable
    b::(Int, Float64, Uint8)
end

f = jldopen("test.jld", "w")
write(f, "ComplexImmutable", ComplexImmutable(SimpleImmutable(1, 2.2), (3, 4.4, 0x05)))
close(f)