[svn-r27945] Purpose: Fix HDFFV-9529

Description:
    Merged from hdf5_CppAPI_Constants

    r27942:
    ------
    Description:
    - Added H5dont_atexit() to getPredType and all the getConstant's to prevent
    the C library from terminating before the C++ library cleanup.
    - More cleanup and added more comments

    r27923:
    ------
    - Updated more comments and moved some things around for consistency
    - Removed check for "new" failure, exceptions would be thrown

    r27922:
    ------
    Description:
        Added function headers and more comments for clarity.

    r27917:
    ------
    Description:
        The C++ library has several types of global constants from different
        classes, such as PropList, PredType, DataSpace, etc...  Previously,
        these global constants were declared statically and the C++ library used
        a constant, called PredType::AtExit, to detect when all the global
        contants are destroyed then close the C library (H5close).  This method
        relied on the order of the constants being created and destroyed and
        that PredType constants be the last to be destroyed.  In September 2015,
        it was recognized that the order in which the global constants were
        created and destroyed was actually undefined, thus can be different
        between different compilers.  This resulted in failure when compilers
        destroy PredType constants before others because when PredType::AtExit
        was destroyed, the C library was closed, so when the constants of other
        classes such as PropList or DataSpace were being deleted, the C library
        would not be available.

    Solution:
        The static approach is changed to dynamic.  In order to avoid an impact
        on existing applications, the static global constants are changed to
        constant references to the dynamically allocated objects.
        A detailed explanation of the new method and a description of the
        changes are in a Design Notes at the end of the file H5PredType.cpp.

        New functions added to support the new methods are listed below.

        class H5Library:
                // Returns a singleton H5Library to initialize the global
                // constants, invoked in IdComponent default constructor
                static H5Library* getInstance(); // public

                // Registers cleanup and terminating functions with atexit(),
                // called in IdComponent default constructor
                static void initH5cpp(void); // public

                // Calls H5close to terminate the library, registered with
                // atexit(), as the last thing to be done.
                static void termH5cpp(void); // public

        class PredType:
                // Creates the constants
                static void makePredTypes(); // private

                // Calls makePredTypes to create the constants and returns
                // the dummy constant PREDTYPE_CONST;
                static PredType* getPredTypes(); // private

        class DataSpace:
                // Creates the constant
                static DataSpace* getConstant(); // private

        class PropList:
                // Creates the constant
                static PropList* getConstant(); // private

        class DSetCreatPropList:
                // Creates the constant
                static DSetCreatPropList* getConstant(); // private

        class DSetMemXferPropList:
                // Creates the constant
                static DSetMemXferPropList* getConstant(); // private

        class FileCreatPropList:
                // Creates the constant
                static FileCreatPropList* getConstant(); // private

        class FileAccPropList:
                // Creates the constant
                static FileAccPropList* getConstant(); // private

        This function is added to PredType, DataSpace, PropList, and the four
        subclasses of PropList:
                // Deletes the constant
                static void deleteConstants(); // public

Platforms tested:
    Linux/32 2.6 (jam)
    Linux/64 (platypus)
    Darwin (osx1010test)

1 files changed, 1 insertions, 0 deletions

diff --git a/c++/src/H5Attribute.cpp b/c++/src/H5Attribute.cpp
index 0bfdff8..cb09980 100644
--- a/c++/src/H5Attribute.cpp
+++ b/c++/src/H5Attribute.cpp
@@ -45,6 +45,7 @@ namespace H5 {
 #endif
 
 class H5_DLLCPP H5Object;  // forward declaration for UserData4Aiterate
+
 //--------------------------------------------------------------------------
 // Function:	Attribute default constructor
 ///\brief	Default constructor: Creates a stub attribute