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create_enum_tc requires the repository ID of the type code, the name of the type, and a sequence containing the names of the enumerators For those parameters marked as optional in Table 161, it is legal to pass an empty string to the corresponding create operation A few of the create operations deserve further explanation create_struct_tc To create the type code of a structure, we must supply the repository ID, the structure name, and sequence of type StructMemberSeq containing one element for each structure member Each element of type StructMember provides the name and type code for the member In addition, it contains an object reference of type IDLType in the type_def member For type code creation, you must always set this object reference to nil (The type_def member of the structure is for use with the Interface Repository) create_union_tc As with structures, the type_def member of the corresponding UnionMember type must be set to a nil reference for type code creation create_recursive_tc To create a recursive type code, we must use create_recursive_tc to create a placeholder type code That type code is replaced with the appropriate information once it is properly embedded in its enclosing type code Consider again the recursive structure from Section 478:
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struct Node { long value; sequence<Node> children; };
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To create the type code for a structure of type Node, we can use the following code:
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CORBA::TypeCode_var placeholder = orb->create_recursive_tc("IDL:Node:10"); CORBA::StructMemberSeq members; memberslength(2); members[0]name = CORBA::string_dup("value"); members[0]type = CORBA::TypeCode::_duplicate(CORBA::_tc_long); members[1]name = CORBA::string_dup("children"); members[1]type = placeholder; CORBA::TypeCode_var struct_tc = orb->create_struct_tc("IDL:Node:10", "Node", members);
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You must not call operations on the recursive placeholder type code until after it is properly embedded in its enclosing type code
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1682 C++ Mapping for Type Code Creation The C++ mapping for the create operations follows the normal rules Rather than repeat the corresponding C++ definitions here, we show two examples to illustrate how you can create type codes for structures and unions Creation of type codes for other types is similar
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Creating the Type Code for a Simple Structure
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Again, here is the IDL for the BtData structure from the climate control system:
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#pragma prefix "acmecom" module CCS { // typedef short TempType; // interface Thermostat : Thermometer { struct BtData { TempType requested; TempType min_permitted; TempType max_permitted; string error_msg; }; // }; // };
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To create a type code for this structure, we must first create type codes for the member types Then we construct a sequence of StructMember values (one for each member) and call create_struct_tc to create the type code for the structure Here is a code fragment that achieves this:
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// // Create an alias for short called "TempType" // CORBA::TypeCode_var TempType_tc; TempType_tc = orb->create_alias_tc( "IDL:acmecom/CCS/TempType:10", "TempType", CORBA::_tc_short ); // // Create a sequence containing the definitions for the // four structure members // CORBA::StructMemberSeq mseq; mseqlength(4); mseq[0]name = CORBA::string_dup("requested"); mseq[0]type = TempType_tc; mseq[0]type_def = CORBA::IDLType::_nil();
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mseq[1]name = CORBA::string_dup("min_permitted"); mseq[1]type = TempType_tc; mseq[1]type_def = CORBA::IDLType::_nil(); mseq[2]name = CORBA::string_dup("max_permitted"); mseq[2]type = TempType_tc; mseq[2]type_def = CORBA::IDLType::_nil(); mseq[3]name = CORBA::string_dup("error_msg"); mseq[3]type = CORBA::TypeCode::_duplicate(CORBA::_tc_string); mseq[3]type_def = CORBA::IDLType::_nil(); // // Create a type code for the BtData structure // CORBA::TypeCode_var BtData_tc; BtData_tc = orb->create_struct_tc( "IDL:acmecom/CCS/Thermostat/BtData:10", "BtData", mseq );
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This code is straightforward It builds the type code starting with the TempType alias Then it constructs the member sequence and calls create_struct_tc to create the complete type code The type code constructed in this way is indistinguishable from the CCS::Thermostat::_tc_BtData constant Note that the preceding example calls _duplicate for the assignment of the CORBA::_tc_string constant reference to get a proper deep copy There is no need to call _duplicate for the references returned by calls to _nil because _nil duplicates the reference for us (see Section 7115) According to Table 161, many of the parameters passed to the create calls can be the empty string Here is the same code example to create a type code for a BtData structure, but this time leaving all type and member names as the empty string:
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// // Create an alias for short // CORBA::TypeCode_var TempType_tc; TempType_tc = orb->create_alias_tc("", "", CORBA::_tc_short); // // Create a sequence containing the definitions for the // four structure members // CORBA::StructMemberSeq mseq; mseqlength(4); mseq[0]type mseq[1]type mseq[2]type mseq[3]type = = = = TempType_tc; TempType_tc; TempType_tc; CORBA::TypeCode::_duplicate(CORBA::_tc_string);
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