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<h1 class="page">Custom Dynamic Buffer</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Implementing the DynamicBuffer concept for a custom allocation strategy.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_you_will_learn"><a class="anchor" href="#_what_you_will_learn"></a>What You Will Learn</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Implementing the DynamicBuffer concept</p>
</li>
<li>
<p>Understanding <code>prepare</code>, <code>commit</code>, <code>consume</code> lifecycle</p>
</li>
<li>
<p>Custom memory management for I/O</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_prerequisites"><a class="anchor" href="#_prerequisites"></a>Prerequisites</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Completed <a href="7g.parallel-fetch.html" class="xref page">Parallel Fetch</a></p>
</li>
<li>
<p>Understanding of dynamic buffers from <a href="../5.buffers/5f.dynamic.html" class="xref page">Dynamic Buffers</a></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_source_code"><a class="anchor" href="#_source_code"></a>Source Code</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">#include &lt;boost/capy.hpp&gt;
#include &lt;boost/capy/test/run_blocking.hpp&gt;
#include &lt;boost/capy/test/stream.hpp&gt;
#include &lt;boost/capy/test/fuse.hpp&gt;
#include &lt;boost/capy/cond.hpp&gt;
#include &lt;iostream&gt;
#include &lt;vector&gt;
#include &lt;cassert&gt;
#include &lt;cstring&gt;
using namespace boost::capy;
// Custom dynamic buffer with statistics tracking
class tracked_buffer
{
std::vector&lt;char&gt; storage_;
std::size_t read_pos_ = 0; // Start of readable data
std::size_t write_pos_ = 0; // End of readable data
std::size_t max_size_;
// Statistics
std::size_t total_prepared_ = 0;
std::size_t total_committed_ = 0;
std::size_t total_consumed_ = 0;
public:
explicit tracked_buffer(std::size_t max_size = 65536)
: max_size_(max_size)
{
storage_.reserve(1024);
}
// === DynamicBuffer interface ===
// Consumer: readable data
const_buffer data() const noexcept
{
return const_buffer(
storage_.data() + read_pos_,
write_pos_ - read_pos_);
}
// Capacity queries
std::size_t size() const noexcept
{
return write_pos_ - read_pos_;
}
std::size_t max_size() const noexcept
{
return max_size_;
}
std::size_t capacity() const noexcept
{
return storage_.capacity() - read_pos_;
}
// Producer: prepare space for writing
mutable_buffer prepare(std::size_t n)
{
total_prepared_ += n;
// Compact if needed
if (storage_.size() + n &gt; storage_.capacity() &amp;&amp; read_pos_ &gt; 0)
{
compact();
}
// Grow if needed
std::size_t required = write_pos_ + n;
if (required &gt; max_size_)
throw std::length_error("tracked_buffer: max_size exceeded");
if (required &gt; storage_.size())
storage_.resize(required);
return mutable_buffer(
storage_.data() + write_pos_,
n);
}
// Producer: mark bytes as written
void commit(std::size_t n)
{
total_committed_ += n;
write_pos_ += n;
}
// Consumer: mark bytes as processed
void consume(std::size_t n)
{
std::size_t actual = std::min(n, size()); // std::size_t
total_consumed_ += actual;
read_pos_ += actual;
if (read_pos_ == write_pos_)
{
// Buffer empty, reset positions
read_pos_ = 0;
write_pos_ = 0;
}
}
// === Statistics ===
void print_stats() const
{
std::cout &lt;&lt; "Buffer statistics:\n"
&lt;&lt; " Total prepared: " &lt;&lt; total_prepared_ &lt;&lt; " bytes\n"
&lt;&lt; " Total committed: " &lt;&lt; total_committed_ &lt;&lt; " bytes\n"
&lt;&lt; " Total consumed: " &lt;&lt; total_consumed_ &lt;&lt; " bytes\n"
&lt;&lt; " Current size: " &lt;&lt; size() &lt;&lt; " bytes\n"
&lt;&lt; " Capacity: " &lt;&lt; capacity() &lt;&lt; " bytes\n";
}
private:
void compact()
{
if (read_pos_ == 0)
return;
std::size_t len = write_pos_ - read_pos_;
std::memmove(storage_.data(), storage_.data() + read_pos_, len);
read_pos_ = 0;
write_pos_ = len;
}
};
// Demonstrate using the custom buffer
task&lt;&gt; read_into_tracked_buffer(test::stream&amp; stream, tracked_buffer&amp; buffer)
{
// Read data in chunks
while (true)
{
auto space = buffer.prepare(256); // mutable_buffer
// ec: std::error_code, n: std::size_t
auto [ec, n] = co_await stream.read_some(space);
if (ec == cond::eof)
break;
if (ec)
throw std::system_error(ec);
buffer.commit(n);
std::cout &lt;&lt; "Read " &lt;&lt; n &lt;&lt; " bytes, buffer size now: "
&lt;&lt; buffer.size() &lt;&lt; "\n";
}
}
void demo_tracked_buffer()
{
std::cout &lt;&lt; "=== Tracked Buffer Demo ===\n\n";
// Setup mock stream with test data
test::fuse f;
test::stream mock(f);
mock.provide("Hello, ");
mock.provide("World! ");
mock.provide("This is a test of the custom buffer.\n");
// Stream returns eof when data is exhausted
tracked_buffer buffer;
test::run_blocking()(read_into_tracked_buffer(mock, buffer));
std::cout &lt;&lt; "\nFinal buffer contents: ";
auto data = buffer.data(); // const_buffer
std::cout.write(static_cast&lt;char const*&gt;(data.data()), data.size());
std::cout &lt;&lt; "\n\n";
buffer.print_stats();
// Consume some data
std::cout &lt;&lt; "\nConsuming 7 bytes...\n";
buffer.consume(7);
buffer.print_stats();
}
int main()
{
demo_tracked_buffer();
return 0;
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_build"><a class="anchor" href="#_build"></a>Build</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cmake hljs" data-lang="cmake">add_executable(custom_dynamic_buffer custom_dynamic_buffer.cpp)
target_link_libraries(custom_dynamic_buffer PRIVATE capy)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_walkthrough"><a class="anchor" href="#_walkthrough"></a>Walkthrough</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_dynamicbuffer_requirements"><a class="anchor" href="#_dynamicbuffer_requirements"></a>DynamicBuffer Requirements</h3>
<div class="paragraph">
<p>A DynamicBuffer must provide:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">// Consumer interface
const_buffer data() const; // Readable data
void consume(std::size_t n); // Mark bytes as processed
// Producer interface
mutable_buffer prepare(std::size_t n); // Space for writing
void commit(std::size_t n); // Mark bytes as written
// Capacity queries
std::size_t size() const; // Readable bytes
std::size_t max_size() const; // Maximum allowed
std::size_t capacity() const; // Currently allocated</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_the_producerconsumer_flow"><a class="anchor" href="#_the_producerconsumer_flow"></a>The Producer/Consumer Flow</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">// 1. Producer prepares space
auto space = buffer.prepare(256); // mutable_buffer
// 2. Data is written into space
// ec: std::error_code, n: std::size_t
auto [ec, n] = co_await stream.read_some(space);
// 3. Producer commits written bytes
buffer.commit(n);
// 4. Consumer reads data
auto data = buffer.data(); // const_buffer
process(data);
// 5. Consumer marks bytes as processed
buffer.consume(processed_bytes);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_memory_management"><a class="anchor" href="#_memory_management"></a>Memory Management</h3>
<div class="paragraph">
<p>The <code>tracked_buffer</code> implementation:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Uses a single contiguous vector</p>
</li>
<li>
<p>Tracks read and write positions</p>
</li>
<li>
<p>Compacts when needed to reuse space</p>
</li>
<li>
<p>Grows on demand up to <code>max_size</code></p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_output"><a class="anchor" href="#_output"></a>Output</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-asciidoc hljs" data-lang="asciidoc">=== Tracked Buffer Demo ===
Read 51 bytes, buffer size now: 51
Final buffer contents: Hello, World! This is a test of the custom buffer.
Buffer statistics:
Total prepared: 512 bytes
Total committed: 51 bytes
Total consumed: 0 bytes
Current size: 51 bytes
Capacity: 1024 bytes
Consuming 7 bytes...
Buffer statistics:
Total prepared: 512 bytes
Total committed: 51 bytes
Total consumed: 7 bytes
Current size: 44 bytes
Capacity: 1017 bytes</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_exercises"><a class="anchor" href="#_exercises"></a>Exercises</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Add a "high water mark" statistic that tracks maximum buffer size reached</p>
</li>
<li>
<p>Implement a ring buffer version that never moves data</p>
</li>
<li>
<p>Add an allocator parameter for custom memory allocation</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_next_steps"><a class="anchor" href="#_next_steps"></a>Next Steps</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><a href="7i.echo-server-corosio.html" class="xref page">Echo Server with Corosio</a> — Real networking</p>
</li>
</ul>
</div>
</div>
</div>
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