ask Graph</a></h2><p>We can describe the wavefront parallelism in a simple two-level loop. Since we need to address the two tasks upper and left to a task when creating its dependencies, we use a 2D vector to pre-allocate all tasks via <a href="classtf_1_1FlowBuilder.html#acab0b4ac82260f47fdb36a3244ee3aaf" class="m-doc">tf::<wbr />Taskflow::<wbr />placeholder</a>.</p><pre class="m-code"><span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;taskflow/taskflow.hpp&gt;</span>

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