H5Topenis a macro that is mapped to eitherH5T_OPEN1orH5T_OPEN2, depending on the needs of the application.
Such macros are provided to facilitate application compatibility. Their use and mappings are fully described in “API Compatibility Macros in HDF5”; we urge you to read that document closely.
When both the HDF5 Library and the application are built and installed with no specific compatibility flags,H5Topenis mapped to the most recent version of the function, currentlyH5Topen2. If the library and/or application is compiled for Release 1.6 emulation,H5Topenwill be mapped toH5Topen1. Function-specific flags are available to override these settings on a function-by-function basis when the application is compiled.
Specific compile-time compatibility flags and the resulting mappings are as follows: