IDL to C++11 initial submission presentation
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This document proposes a new mapping from IDL to C++11. The mapping aims to simplify the existing IDL to C++ mapping by taking advantage of new C++11 features to gain performance, reduce errors and code, and remove the need for conversions between IDL and C++ types. It outlines high-level concepts like mapping basic IDL types to C++11 counterparts. It also describes how interfaces, arguments, structs/unions would be mapped. A proof-of-concept implementation called IDL2C++11 is mentioned along with next steps to address comments and expand the mapping.
IDL to C++11 initial submission presentation
- 1. IDL to C++0x/C++11 Initial submission OMG document mars/2011-09-04 Copyright © 2011 Page 1
- 2. RFP asks for The new mapping should be functionally equivalent to the existing IDL to C++ mapping. While the syntax may change, an application should be able to implement functionality identical to that which can be achieved with the current IDL to C++ mapping. Applications programmed using alternative language mappings should inter operate transparently. An application utilizing this new language mapping should have no awareness, other than informational, of what language mapping a peer application is using. The new language mapping should be designed to co-exist with other technologies. Specifically, it should not interfere with the namespaces used by other OMG specifications, or commonly used packages. Interoperability between the IDL to C++ and IDL to C++0x mapping in the same compilation unit is not required. Copyright © 2011 Page 2
- 3. C++11 C++0x was unanimously approved August 12 th 2011 Is now formally available as ISO/IEC 14882:2011 Unofficially named C++11 Copyright © 2011 Page 3
- 4. Goal of IDL to C++11 Simplified mapping for C++11 Make use of the new C++11 features to – Gain performance – Reduce coding errors – Reduce amount of code – No need to create conversion between STL/C++ types and IDL based types Copyright © 2011 Page 4
- 5. Concepts Map basic types to their C++11 counterparts IDL (w)string map to std::(w)string IDL sequences map to std::vector Copyright © 2011 Page 5
- 6. Interface mapping When defining interface Foo, than Foo is the object reference C++ traits are used to determine the type for the proxy and skeleton base classes, not the name and how they are implemented – Foo::local_base_type – Foo::servant_type – Foo::servant_base_type Foo as object reference has the semantics of std::shared_ptr<> Copyright © 2011 Page 6
- 7. Nil object references C++11 has a new type for a nil pointer: nullptr_t Object references can be checked for nil by comparing them with nullptr Explicit bool conversion operators for usage in for example if statements Copyright © 2011 Page 7
- 8. Argument passing Argument passing is the same for any type – in: const T& – inout: T& – out: T& – return: T C++ method interfaces will not change if for example a typedef is changed from basic type to complex type. Copyright © 2011 Page 8
- 9. Struct/union Struct and union now both map to a C++ class Providing constructor(s), copy and move operators Set of accessors for each member: – void A (const T&); – void A (T&&); – const T& A (void) const; – T& A (void); Copyright © 2011 Page 9
- 10. What next? Address comments on initial submission Add mapping for arrays/abstract/valuetype/any Extend mapping with sequence traits, ostream insertion operators, and more if needed Check out IDL annotations when they are part of the formal IDL specification. Mostly interesting for user defined mapping of IDL types. Copyright © 2011 Page 10
- 11. Proof of concept New language binding for TAO: IDL2C++11 Supports the initial submission and more More details on http://osportal.remedy.nl and http://www.orbzone.org Copyright © 2011 Page 11
- 12. Thanks for your attention Johnny Willemsen <[email protected]> http://www.theaceorb.nl Copyright © 2011 Page 12