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📝 WalkthroughWalkthroughThe PR reorders CMake build sequence, refactors buffer class hierarchy by eliminating inheritance, introduces ASIO buffer sequence adaptor, renames coroutine allocator APIs to frame_allocator throughout, conditionalizes mimalloc support based on BUILD_SHARED_LIBS, and updates example code for ASIO buffer compatibility. Changes
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Possibly related issues
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⚠️ Outside diff range comments (2)
include/boost/capy/ex/io_awaitable_promise_base.hpp (1)
29-131:⚠️ Potential issue | 🟡 MinorStale
allocatorreferences remain in the class-level documentation.The rename from
allocatortoframe_allocatorwas applied to the code and to theawait_transformdoc, but four occurrences in the class-level Doxygen block still reference the old name:
Line Current text Should be 42 co_await this_coro::allocatorco_await this_coro::frame_allocator68 env->allocatorenv->frame_allocator73 co_await this_coro::allocatorco_await this_coro::frame_allocator128 this_coro::allocatorthis_coro::frame_allocator📝 Proposed fix
- and `co_await this_coro::allocator`. + and `co_await this_coro::frame_allocator`.- // Access env->executor, env->stop_token, env->allocator + // Access env->executor, env->stop_token, env->frame_allocator- auto* alloc = co_await this_coro::allocator; + auto* alloc = co_await this_coro::frame_allocator;- `@see` this_coro::environment, this_coro::executor, - this_coro::stop_token, this_coro::allocator + `@see` this_coro::environment, this_coro::executor, + this_coro::stop_token, this_coro::frame_allocator🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@include/boost/capy/ex/io_awaitable_promise_base.hpp` around lines 29 - 131, Update the class-level Doxygen to use the new name "frame_allocator" everywhere the old "allocator" appears: change `co_await this_coro::allocator` to `co_await this_coro::frame_allocator`, change occurrences of `env->allocator` to `env->frame_allocator`, and update the final reference `this_coro::allocator` to `this_coro::frame_allocator`; search for these exact tokens in the docblock around the io_awaitable_promise_base comment and replace them so the docs match the code and await_transform wording.example/allocation/allocation.cpp (1)
71-77:⚠️ Potential issue | 🟡 Minor
do_is_equaluses identity comparison but mimalloc uses a global heapPer
[mem.res.private],do_is_equalmust returntrueif and only if memory allocated by*thiscan safely be deallocated byother. Since allmi_memory_resourceinstances route through the same global mimalloc heap, cross-instance deallocation is safe anddo_is_equalshould compare types, not identities.The current
this == &otherincorrectly returnsfalsefor two separate instances, which can trigger unnecessary copies in PMR containers on move/swap across differently-addressed resources.🐛 Proposed fix
bool do_is_equal( memory_resource const& other) const noexcept override { - return this == &other; + return dynamic_cast<mi_memory_resource const*>(&other) != nullptr; }🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@example/allocation/allocation.cpp` around lines 71 - 77, The do_is_equal method currently compares instance identities (this == &other) which is wrong for mi_memory_resource because all instances share the same global mimalloc heap; change do_is_equal in the mi_memory_resource-derived class to compare types instead (e.g., return typeid(*this) == typeid(other) or return dynamic_cast<const mi_memory_resource*>(&other) != nullptr) so that distinct instances of the same resource type compare equal and cross-instance deallocation is allowed.
🧹 Nitpick comments (1)
example/allocation/allocation.cpp (1)
10-30: High-level overview comment should be a/* */block placed after the includesThe existing
//-style overview at lines 10–16 is placed before the#includedirectives. Per coding guidelines, non-trivial implementation files should have a/* */block comment after the includes providing the high-level overview.♻️ Suggested relocation
-// -// Allocation Example -// -// Compares the performance of three frame allocators: the default -// recycling allocator, mimalloc, and std::allocator (no recycling). -// A 4-deep coroutine chain is invoked 2 million times with each. -// - `#include` <boost/capy.hpp> `#include` <boost/capy/test/run_blocking.hpp> `#if` BOOST_CAPY_HAS_MIMALLOC `#include` <mimalloc.h> `#endif` `#include` <atomic> `#include` <chrono> `#include` <cmath> `#include` <cstddef> `#include` <iomanip> `#include` <iostream> `#include` <memory_resource> `#include` <sstream> + +/* + * Allocation Example + * + * Compares the performance of three frame allocators: the default + * recycling allocator, mimalloc, and std::allocator (no recycling). + * A 4-deep coroutine chain is invoked 2 million times with each. + * mimalloc support is conditionally compiled via BOOST_CAPY_HAS_MIMALLOC. + */🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@example/allocation/allocation.cpp` around lines 10 - 30, Convert the top-of-file // style high-level overview (the "Allocation Example" lines currently before the `#include` directives) into a /* ... */ block and move it immediately after the `#include` section; specifically, locate the existing single-line comments that describe the allocator comparison and coroutine chain and replace them with a single multi-line block comment placed after the last `#include`, preserving the original text and formatting so the file-level overview appears after the includes rather than before them.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@CMakeLists.txt`:
- Around line 101-114: The tests assume Boost::asio is provided by building the
example, but BOOST_CAPY_BUILD_EXAMPLES and BOOST_CAPY_BUILD_TESTS are
independent; fix by enforcing the dependency or relocating the discovery: either
add an explicit guard in the root CMakeLists.txt that errors or forces
BOOST_CAPY_BUILD_EXAMPLES=ON when BOOST_CAPY_BUILD_TESTS is ON (referencing the
variables BOOST_CAPY_BUILD_EXAMPLES and BOOST_CAPY_BUILD_TESTS), or move the
Boost::asio discovery (find_package(Boost COMPONENTS asio) / find_package(Boost
REQUIRED COMPONENTS asio)) into the test CMakeLists (e.g.,
test/unit/CMakeLists.txt) or the root so tests directly find and link
Boost::asio without relying on the example target; implement one of these
options and update test/unit/CMakeLists.txt to link to Boost::asio
unconditionally when tests are enabled.
In `@example/allocation/CMakeLists.txt`:
- Around line 10-18: Add a short clarifying comment above the conditional that
fetches and links mimalloc explaining why the mimalloc arm is gated on
BUILD_SHARED_LIBS (e.g., to avoid ODR/multiple allocator-instance issues when
Boost::capy is built SHARED, or because the static build should not include the
mimalloc benchmark), and state whether this is intentional or should instead be
inverted to NOT BUILD_SHARED_LIBS; reference the BUILD_SHARED_LIBS symbol and
the mimalloc / mimalloc-static linkage to make the intent clear relative to
Boost::capy and the benchmark behavior.
In `@include/boost/capy/buffers/asio.hpp`:
- Around line 303-306: The constraint on the from_asio template is too broad
because the second disjunct allows any bidirectional range (e.g.,
std::vector<int>), causing hard errors instead of SFINAE-failure; tighten the
concept to require that the range's value type is convertible to
asio::const_buffer (or that the range is a range_of/asio::const_buffer), i.e.
replace the plain std::ranges::bidirectional_range<std::remove_cvref_t<BS>> with
a conjunction that also requires
std::convertible_to<std::ranges::range_value_t<std::remove_cvref_t<BS>>,
asio::const_buffer> (or the equivalent range_of/asio::const_buffer trait) so
from_asio only participates in overload resolution when elements are
buffer-like.
---
Outside diff comments:
In `@example/allocation/allocation.cpp`:
- Around line 71-77: The do_is_equal method currently compares instance
identities (this == &other) which is wrong for mi_memory_resource because all
instances share the same global mimalloc heap; change do_is_equal in the
mi_memory_resource-derived class to compare types instead (e.g., return
typeid(*this) == typeid(other) or return dynamic_cast<const
mi_memory_resource*>(&other) != nullptr) so that distinct instances of the same
resource type compare equal and cross-instance deallocation is allowed.
In `@include/boost/capy/ex/io_awaitable_promise_base.hpp`:
- Around line 29-131: Update the class-level Doxygen to use the new name
"frame_allocator" everywhere the old "allocator" appears: change `co_await
this_coro::allocator` to `co_await this_coro::frame_allocator`, change
occurrences of `env->allocator` to `env->frame_allocator`, and update the final
reference `this_coro::allocator` to `this_coro::frame_allocator`; search for
these exact tokens in the docblock around the io_awaitable_promise_base comment
and replace them so the docs match the code and await_transform wording.
---
Nitpick comments:
In `@example/allocation/allocation.cpp`:
- Around line 10-30: Convert the top-of-file // style high-level overview (the
"Allocation Example" lines currently before the `#include` directives) into a /*
... */ block and move it immediately after the `#include` section; specifically,
locate the existing single-line comments that describe the allocator comparison
and coroutine chain and replace them with a single multi-line block comment
placed after the last `#include`, preserving the original text and formatting so
the file-level overview appears after the includes rather than before them.
| # Examples (before tests so Boost::asio is available) | ||
| # | ||
| #------------------------------------------------- | ||
| if (BOOST_CAPY_BUILD_TESTS) | ||
| add_subdirectory(test) | ||
| if (BOOST_CAPY_BUILD_EXAMPLES) | ||
| add_subdirectory(example) | ||
| endif () | ||
|
|
||
| #------------------------------------------------- | ||
| # | ||
| # Examples | ||
| # Tests | ||
| # | ||
| #------------------------------------------------- | ||
| if (BOOST_CAPY_BUILD_EXAMPLES) | ||
| add_subdirectory(example) | ||
| if (BOOST_CAPY_BUILD_TESTS) | ||
| add_subdirectory(test) |
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Implicit Boost::asio availability dependency is not enforced
The comment states tests depend on examples being built first to make Boost::asio available, but both are independently guarded. If BOOST_CAPY_BUILD_EXAMPLES=OFF and BOOST_CAPY_BUILD_TESTS=ON (a common CI configuration), tests will be configured without Boost::asio, causing a silent failure—tests compile but the conditional link against Boost::asio (in test/unit/CMakeLists.txt) is skipped since the target is never created.
Consider either:
- Adding an explicit CMake guard, or
- Moving the
Boost::asiodiscovery into the testCMakeLists.txt(or the root) rather than relying on examples as a side-effect.
🛡️ Suggested guard
+if (BOOST_CAPY_BUILD_TESTS AND NOT BOOST_CAPY_BUILD_EXAMPLES)
+ message(FATAL_ERROR
+ "BOOST_CAPY_BUILD_TESTS requires BOOST_CAPY_BUILD_EXAMPLES "
+ "(or a standalone Boost::asio discovery in test/CMakeLists.txt)")
+endif()
+
`#-------------------------------------------------`
#
# Examples (before tests so Boost::asio is available)🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@CMakeLists.txt` around lines 101 - 114, The tests assume Boost::asio is
provided by building the example, but BOOST_CAPY_BUILD_EXAMPLES and
BOOST_CAPY_BUILD_TESTS are independent; fix by enforcing the dependency or
relocating the discovery: either add an explicit guard in the root
CMakeLists.txt that errors or forces BOOST_CAPY_BUILD_EXAMPLES=ON when
BOOST_CAPY_BUILD_TESTS is ON (referencing the variables
BOOST_CAPY_BUILD_EXAMPLES and BOOST_CAPY_BUILD_TESTS), or move the Boost::asio
discovery (find_package(Boost COMPONENTS asio) / find_package(Boost REQUIRED
COMPONENTS asio)) into the test CMakeLists (e.g., test/unit/CMakeLists.txt) or
the root so tests directly find and link Boost::asio without relying on the
example target; implement one of these options and update
test/unit/CMakeLists.txt to link to Boost::asio unconditionally when tests are
enabled.
| if(BUILD_SHARED_LIBS) | ||
| include(FetchContent) | ||
| FetchContent_Declare(mimalloc | ||
| GIT_REPOSITORY https://github.com/microsoft/mimalloc | ||
| GIT_TAG v2.2.7 | ||
| GIT_SHALLOW TRUE) | ||
| set(MI_BUILD_TESTS OFF CACHE BOOL "Disable mimalloc tests" FORCE) | ||
| FetchContent_MakeAvailable(mimalloc) | ||
| endif() |
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Add clarifying comment explaining the BUILD_SHARED_LIBS condition for mimalloc
The mimalloc setup (lines 10–18) and linking of mimalloc-static (lines 31–35) are both gated on BUILD_SHARED_LIBS=ON. This is counterintuitive: BUILD_SHARED_LIBS controls whether Boost::capy is built as a SHARED or STATIC library, and linking a static allocator specifically when using shared libraries—while omitting the mimalloc arm of the benchmark in the static build—needs explanation.
Add a comment clarifying the design intent: e.g., whether this avoids ODR/allocator-instance issues when Boost::capy is shared, or whether the condition should be inverted to NOT BUILD_SHARED_LIBS.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@example/allocation/CMakeLists.txt` around lines 10 - 18, Add a short
clarifying comment above the conditional that fetches and links mimalloc
explaining why the mimalloc arm is gated on BUILD_SHARED_LIBS (e.g., to avoid
ODR/multiple allocator-instance issues when Boost::capy is built SHARED, or
because the static build should not include the mimalloc benchmark), and state
whether this is intentional or should instead be inverted to NOT
BUILD_SHARED_LIBS; reference the BUILD_SHARED_LIBS symbol and the mimalloc /
mimalloc-static linkage to make the intent clear relative to Boost::capy and the
benchmark behavior.
| template<class BS> | ||
| requires std::is_convertible_v< | ||
| std::remove_cvref_t<BS>, asio::const_buffer> || | ||
| std::ranges::bidirectional_range<std::remove_cvref_t<BS>> |
There was a problem hiding this comment.
from_asio constraint is too permissive — accepts any bidirectional range.
The second disjunct std::ranges::bidirectional_range<std::remove_cvref_t<BS>> doesn't verify that the range's element type is an asio buffer. A std::vector<int> satisfies this constraint and will produce a hard error inside the function body rather than a clean SFINAE/concept failure. Consider tightening, e.g.:
Proposed fix
template<class BS>
requires std::is_convertible_v<
std::remove_cvref_t<BS>, asio::const_buffer> ||
- std::ranges::bidirectional_range<std::remove_cvref_t<BS>>
+ (std::ranges::bidirectional_range<std::remove_cvref_t<BS>> &&
+ std::is_convertible_v<
+ std::ranges::range_value_t<std::remove_cvref_t<BS>>,
+ asio::const_buffer>)🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@include/boost/capy/buffers/asio.hpp` around lines 303 - 306, The constraint
on the from_asio template is too broad because the second disjunct allows any
bidirectional range (e.g., std::vector<int>), causing hard errors instead of
SFINAE-failure; tighten the concept to require that the range's value type is
convertible to asio::const_buffer (or that the range is a
range_of/asio::const_buffer), i.e. replace the plain
std::ranges::bidirectional_range<std::remove_cvref_t<BS>> with a conjunction
that also requires
std::convertible_to<std::ranges::range_value_t<std::remove_cvref_t<BS>>,
asio::const_buffer> (or the equivalent range_of/asio::const_buffer trait) so
from_asio only participates in overload resolution when elements are
buffer-like.
|
GCOVR code coverage report https://178.capy.prtest3.cppalliance.org/gcovr/index.html Build time: 2026-02-21 03:58:31 UTC |
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