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Memory managment

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hooks for defining your own memory managment functions

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<!-- ##### USER_FUNCTION IptcMemAllocFunc ##### -->
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<!-- ##### USER_FUNCTION IptcMemReallocFunc ##### -->
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<!-- ##### USER_FUNCTION IptcMemFreeFunc ##### -->
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<!-- ##### STRUCT IptcMem ##### -->
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<!-- ##### FUNCTION iptc_mem_new ##### -->
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<!-- ##### FUNCTION iptc_mem_ref ##### -->
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<!-- ##### FUNCTION iptc_mem_unref ##### -->
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<!-- ##### FUNCTION iptc_mem_alloc ##### -->
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<!-- ##### FUNCTION iptc_mem_realloc ##### -->
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<!-- ##### FUNCTION iptc_mem_free ##### -->
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<!-- ##### FUNCTION iptc_mem_new_default ##### -->
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