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Documenter.jl committed Sep 19, 2024
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2 changes: 1 addition & 1 deletion previews/PR535/.documenter-siteinfo.json
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{"documenter":{"julia_version":"1.10.5","generation_timestamp":"2024-09-14T07:51:17","documenter_version":"1.7.0"}}
{"documenter":{"julia_version":"1.10.5","generation_timestamp":"2024-09-19T07:31:22","documenter_version":"1.7.0"}}
2 changes: 1 addition & 1 deletion previews/PR535/advanced/index.html
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# to an `Upgrade` instance with the new struct.
load(&quot;test.jld2&quot;, &quot;data&quot;; typemap=Dict(&quot;Main.OldStructVersion&quot; =&gt; JLD2.Upgrade(UpdatedStruct)))</code></pre><h2 id="Groups-Appending-to-files"><a class="docs-heading-anchor" href="#Groups-Appending-to-files">Groups - Appending to files</a><a id="Groups-Appending-to-files-1"></a><a class="docs-heading-anchor-permalink" href="#Groups-Appending-to-files" title="Permalink"></a></h2><p>Group objects can be constructed with two optional keyword arguments:</p><pre><code class="language-julia hljs">g = Group(file;
est_num_entries=4
est_link_name_len=8)</code></pre><p>These determine how much (additional) empty space should be allocated for the group description. (list of entries) This can be useful for performance when one expects to append many additional datasets after first writing the file.</p><h2 id="JLD2DebugTools"><a class="docs-heading-anchor" href="#JLD2DebugTools">JLD2DebugTools</a><a id="JLD2DebugTools-1"></a><a class="docs-heading-anchor-permalink" href="#JLD2DebugTools" title="Permalink"></a></h2><p>There is an experimental repository <a href="https://github.com/JonasIsensee/JLD2DebugTools.jl">JLD2DebugTools.jl</a> that may help with debugging files.</p><h2 id="Fallback-Behaviour"><a class="docs-heading-anchor" href="#Fallback-Behaviour">Fallback Behaviour</a><a id="Fallback-Behaviour-1"></a><a class="docs-heading-anchor-permalink" href="#Fallback-Behaviour" title="Permalink"></a></h2><p>By default JLD2 will attempt to open files using the <code>MmapIO</code> backend. If that fails, it retries using <code>IOStream</code>.</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../hdf5compat/">« HDF5 Compatibility</a><a class="docs-footer-nextpage" href="../legacy/">Legacy »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.7.0 on <span class="colophon-date" title="Saturday 14 September 2024 07:51">Saturday 14 September 2024</span>. Using Julia version 1.10.5.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
est_link_name_len=8)</code></pre><p>These determine how much (additional) empty space should be allocated for the group description. (list of entries) This can be useful for performance when one expects to append many additional datasets after first writing the file.</p><h2 id="JLD2DebugTools"><a class="docs-heading-anchor" href="#JLD2DebugTools">JLD2DebugTools</a><a id="JLD2DebugTools-1"></a><a class="docs-heading-anchor-permalink" href="#JLD2DebugTools" title="Permalink"></a></h2><p>There is an experimental repository <a href="https://github.com/JonasIsensee/JLD2DebugTools.jl">JLD2DebugTools.jl</a> that may help with debugging files.</p><h2 id="Fallback-Behaviour"><a class="docs-heading-anchor" href="#Fallback-Behaviour">Fallback Behaviour</a><a id="Fallback-Behaviour-1"></a><a class="docs-heading-anchor-permalink" href="#Fallback-Behaviour" title="Permalink"></a></h2><p>By default JLD2 will attempt to open files using the <code>MmapIO</code> backend. If that fails, it retries using <code>IOStream</code>.</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../hdf5compat/">« HDF5 Compatibility</a><a class="docs-footer-nextpage" href="../legacy/">Legacy »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.7.0 on <span class="colophon-date" title="Thursday 19 September 2024 07:31">Thursday 19 September 2024</span>. Using Julia version 1.10.5.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
2 changes: 1 addition & 1 deletion previews/PR535/compression/index.html
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# Don&#39;t compress this
write(f, &quot;large_array&quot;, rand(10000))
end</code></pre></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../customserialization/">« Custom Serialization</a><a class="docs-footer-nextpage" href="../internals/">Internals &amp; Design »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.7.0 on <span class="colophon-date" title="Saturday 14 September 2024 07:51">Saturday 14 September 2024</span>. Using Julia version 1.10.5.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
end</code></pre></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../customserialization/">« Custom Serialization</a><a class="docs-footer-nextpage" href="../internals/">Internals &amp; Design »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.7.0 on <span class="colophon-date" title="Thursday 19 September 2024 07:31">Thursday 19 September 2024</span>. Using Julia version 1.10.5.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
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arr = [B(rand()) for i=1:10]

@save &quot;test.jld2&quot; arr</code></pre><p>In this example JLD2 converts the array of <code>B</code> structs to a plain <code>Vector{Float64}</code> prior to storing to disk.</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../">« Basics</a><a class="docs-footer-nextpage" href="../compression/">Compression »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.7.0 on <span class="colophon-date" title="Saturday 14 September 2024 07:51">Saturday 14 September 2024</span>. Using Julia version 1.10.5.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
@save &quot;test.jld2&quot; arr</code></pre><p>In this example JLD2 converts the array of <code>B</code> structs to a plain <code>Vector{Float64}</code> prior to storing to disk.</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../">« Basics</a><a class="docs-footer-nextpage" href="../compression/">Compression »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.7.0 on <span class="colophon-date" title="Thursday 19 September 2024 07:31">Thursday 19 September 2024</span>. Using Julia version 1.10.5.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
2 changes: 1 addition & 1 deletion previews/PR535/hdf5compat/index.html
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}
}
}</code></pre><p>We can see that the file contains two things at top-level. There is a dataset <code>&quot;a&quot;</code> (that is what we wanted to store) and there is a group <code>_types</code> which is where all the necessary type information is stored.</p><p>You can see that JLD2 <em>committed</em> two compound datatypes. The first one is <code>Core.Datatype</code> which at first seems rather unintuitive. It is needed to tell HDF5 what a serialized julia datatype looks like (a name and a list of parameters).</p><p>Below that is the definition of <code>MyCustomStruct</code> with two fields <code>H5T_STD_I64LE &quot;x&quot;</code> and <code>H5T_IEEE_F64LE &quot;y&quot;</code> defining the integer field <code>x</code> and the float field <code>y</code>.</p><h2 id="A-note-on-pointers"><a class="docs-heading-anchor" href="#A-note-on-pointers">A note on pointers</a><a id="A-note-on-pointers-1"></a><a class="docs-heading-anchor-permalink" href="#A-note-on-pointers" title="Permalink"></a></h2><p>In the julia programming language pointers <code>Ptr</code> are not needed very often. However, when binary dependencies come into play and memory is passed back and forth, pointers do become relevant. Pointers are addresses to locations in memory and thus lose their meaning after a program has terminated.</p><p>In principle, there is little point in storing a pointer to a file but in order to allow for a more seamless experience JLD2 will, similar to <code>Base.Serialization</code> silently accept pointers. This is useful when storing large structures such as a <code>DifferentialEquations.jl</code> solution object that might contain a pointer somewhere. Upon deserialization any pointer fields are instantiated as null pointers.</p><p>This is done with just three lines of code utilizing the custom serialization logic and it is shown here as it serves as a good example for usage of that feature.</p><pre><code class="language-julia hljs">writeas(::Type{&lt;:Ptr}) = Nothing
rconvert(::Type{Ptr{T}}, ::Nothing) where {T} = Ptr{T}()</code></pre><p>Usually one would also have to define a method for <code>wconvert</code>. However, in this case JLD2 figures out that no explicit conversion is needed to construct <code>nothing</code>.</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../internals/">« Internals &amp; Design</a><a class="docs-footer-nextpage" href="../advanced/">Advanced Usage »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.7.0 on <span class="colophon-date" title="Saturday 14 September 2024 07:51">Saturday 14 September 2024</span>. Using Julia version 1.10.5.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
rconvert(::Type{Ptr{T}}, ::Nothing) where {T} = Ptr{T}()</code></pre><p>Usually one would also have to define a method for <code>wconvert</code>. However, in this case JLD2 figures out that no explicit conversion is needed to construct <code>nothing</code>.</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../internals/">« Internals &amp; Design</a><a class="docs-footer-nextpage" href="../advanced/">Advanced Usage »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.7.0 on <span class="colophon-date" title="Thursday 19 September 2024 07:31">Thursday 19 September 2024</span>. Using Julia version 1.10.5.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
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