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<h1 class="doxsection"><a class="anchor" id="secAccessibility"></a>
Accessibility</h1>
<h2 class="doxsection"><a class="anchor" id="CB_MaintainCompat"></a>
Maintaining Compatibility with other HDF5 Library Versions</h2>
<dl class="section user"><dt>Problem</dt><dd>You want to ensure that the HDF5 files you produce or modify are accessible by all releavnt tools and applications</dd></dl>
<dl class="section user"><dt>Solution</dt><dd>For HDF5 items (objects, attributes, etc.) that you would like to create in new or existing HDF5 files, ascertain the supported range of HDF5 library versions as lower and upper bounds. When creating new or opening existing HDF5 files, use a file access property list and configure the supported range via the <a class="el" href="group___f_a_p_l.html#gacbe1724e7f70cd17ed687417a1d2a910" title="Controls the range of library release versions used when creating objects in a file.">H5Pset_libver_bounds()</a> function.<br />
In the example below, we restrict HDF5 item creation to the HDF5 1.8.x family of library versions. <div class="fragment"><div class="line"><span class="lineno"> 15</span> {</div>
<div class="line"><span class="lineno"> 16</span> __label__ fail_fapl, fail_file;</div>
<div class="line"><span class="lineno"> 17</span> <a class="code hl_typedef" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> fapl, file, aspace, attr;</div>
<div class="line"><span class="lineno"> 18</span> </div>
<div class="line"><span class="lineno"> 19</span> <span class="keywordflow">if</span> ((fapl = <a class="code hl_function" href="group___p_l_c_r.html#gaf1b11da01d4d45d788c45f8bc5f0cbfa">H5Pcreate</a>(<a class="code hl_define" href="_h5_ppublic_8h.html#a60ec2d4334addfc0eda89614598ee38e">H5P_FILE_ACCESS</a>)) &lt; 0) {</div>
<div class="line"><span class="lineno"> 20</span> ret_val = EXIT_FAILURE;</div>
<div class="line"><span class="lineno"> 21</span> <span class="keywordflow">goto</span> fail_fapl;</div>
<div class="line"><span class="lineno"> 22</span> }</div>
<div class="line"><span class="lineno"> 23</span><span class="preprocessor">#if H5_VERSION_GE(1, 10, 0)</span></div>
<div class="line"><span class="lineno"> 24</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="group___f_a_p_l.html#gacbe1724e7f70cd17ed687417a1d2a910">H5Pset_libver_bounds</a>(fapl, <a class="code hl_enumvalue" href="_h5_fpublic_8h.html#a2d963b599894f684571fbd4d5e8a96a2a434ca8def77a117013577c8cec6af0d8">H5F_LIBVER_V18</a>, <a class="code hl_enumvalue" href="_h5_fpublic_8h.html#a2d963b599894f684571fbd4d5e8a96a2a434ca8def77a117013577c8cec6af0d8">H5F_LIBVER_V18</a>) &lt; 0) {</div>
<div class="line"><span class="lineno"> 25</span><span class="preprocessor">#elif H5_VERSION_GE(1, 8, 0)</span></div>
<div class="line"><span class="lineno"> 26</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="group___f_a_p_l.html#gacbe1724e7f70cd17ed687417a1d2a910">H5Pset_libver_bounds</a>(fapl, <a class="code hl_enumvalue" href="_h5_fpublic_8h.html#a2d963b599894f684571fbd4d5e8a96a2aa1212669916e7389d0a687a3673153b0">H5F_LIBVER_LATEST</a>, <a class="code hl_enumvalue" href="_h5_fpublic_8h.html#a2d963b599894f684571fbd4d5e8a96a2aa1212669916e7389d0a687a3673153b0">H5F_LIBVER_LATEST</a>) &lt; 0) {</div>
<div class="line"><span class="lineno"> 27</span><span class="preprocessor">#else</span></div>
<div class="line"><span class="lineno"> 28</span><span class="preprocessor">#error Only HDF5 1.8.x and later supported.</span></div>
<div class="line"><span class="lineno"> 29</span><span class="preprocessor">#endif</span></div>
<div class="line"><span class="lineno"> 30</span> ret_val = EXIT_FAILURE;</div>
<div class="line"><span class="lineno"> 31</span> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"><span class="lineno"> 32</span> }</div>
<div class="line"><span class="lineno"> 33</span> <span class="keywordflow">if</span> ((file = <a class="code hl_function" href="group___h5_f.html#gae64b51ee9ac0781bc4ccc599d98387f4">H5Fcreate</a>(<span class="stringliteral">&quot;set_libver_bounds.h5&quot;</span>, <a class="code hl_define" href="_h5_fpublic_8h.html#a5a2d6726f9ad8d2bca8df2b817e5ad6a">H5F_ACC_TRUNC</a>, <a class="code hl_define" href="_h5_ppublic_8h.html#afa85e97bfbf9bf1c58e39263846c568f">H5P_DEFAULT</a>, fapl)) &lt; 0) {</div>
<div class="line"><span class="lineno"> 34</span> ret_val = EXIT_FAILURE;</div>
<div class="line"><span class="lineno"> 35</span> <span class="keywordflow">goto</span> fail_file;</div>
<div class="line"><span class="lineno"> 36</span> }</div>
<div class="line"><span class="lineno"> 37</span> </div>
<div class="line"><span class="lineno"> 38</span> <a class="code hl_function" href="group___h5_f.html#gac55cd91d80822e4f8c2a7f04ea71b124">H5Fclose</a>(file);</div>
<div class="line"><span class="lineno"> 39</span>fail_file:</div>
<div class="line"><span class="lineno"> 40</span> <a class="code hl_function" href="group___p_l_c_r.html#ga5dce61149211d3ef319452aa598887fb">H5Pclose</a>(fapl);</div>
<div class="line"><span class="lineno"> 41</span>fail_fapl:;</div>
<div class="line"><span class="lineno"> 42</span> }</div>
</div><!-- fragment --></dd></dl>
<dl class="section user"><dt>Discussion</dt><dd>See RFC <a href="https://support.hdfgroup.org/releases/hdf5/documentation/rfc/RFC-bounds.pdf">Setting Bounds for Object Creation in HDF5 1.10.0</a> for a detailed and comprehensive account of HDF5 versioning (library, file format spec., etc.) and the <a class="el" href="group___f_a_p_l.html#gacbe1724e7f70cd17ed687417a1d2a910" title="Controls the range of library release versions used when creating objects in a file.">H5Pset_libver_bounds()</a> function.<br />
The default range <a class="el" href="_h5_fpublic_8h.html#a2d963b599894f684571fbd4d5e8a96a2abed98059b4a02d048b1eb3985fba5fa1">H5F_LIBVER_EARLIEST</a> (low) - <a class="el" href="_h5_fpublic_8h.html#a2d963b599894f684571fbd4d5e8a96a2aa1212669916e7389d0a687a3673153b0">H5F_LIBVER_LATEST</a> (high) offers the widest compatibility range, but may not be suitable for certain (feature-)use cases.<br />
The HDF5 library comes with a <em>forward-</em> and <em>backward-compatibility</em> guarantee: This means that the latest version of the library can always read HDF5 files created by a version realesed earlier (backward compatibility). It also means that a given release of the library can read the contents of HDF5 files created with later versions of the library as long as the files do not contain features introduced in later versions (forward compatibility).</dd></dl>
<dl class="section user"><dt>See Also</dt><dd>See the recipe <a class="el" href="_attributes.html#CB_LargeAttributes" title="Creating &quot;Large&quot; HDF5 Attributes">Creating "Large" HDF5 Attributes</a> for an example where we use HDF5 compatibility settings to enable the creation of large HDF5 attributes.</dd></dl>
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