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Client APIs and toolsYou can use the HCL Informix® implementation of client APIs to develop applications for Informix® database servers.
Informix® Object Interface for C++ GuideThe Informix® Object Interface for C++ Programmer's Guide describes how to develop HCL Informix® client applications by using the object-oriented C++ programming language.
Create and extend value objectsWhen you retrieve values from the HCL Informix® database by using the , the values are returned as value objects. Value objects are created by the Object Interface for C++ by using an extensible class factory that maps Informix® data types to C++ objects.
Dynamic loadingDynamic loading is the feature that enables you to use shared object libraries to support value objects.
Guidelines

Guidelines

When building Object Interface for C++ applications, observe the following guidelines:

Linkage: the shared object library factory routine must have C linkage, not C++ linkage. For example:
```
extern "C" ITValue *makePoly3D(ITMVDesc *mv);
```
Mapping changes: if the map file changes after a client application has loaded a shared object library, the application must flush its in-core map and reload (by calling the ReloadMapFiles method of the ITFactory class).

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