PengZheng commented on code in PR #447:
URL: https://github.com/apache/celix/pull/447#discussion_r1032907907
##########
conanfile.py:
##########
@@ -88,6 +90,8 @@ class CelixConan(ConanFile):
"enable_address_sanitizer": False,
"enable_undefined_sanitizer": False,
"enable_thread_sanitizer": False,
+ "enable_testing_dependency_manager_for_cxx11": False,
+ "eenable_testing_for_cxx14": False,
Review Comment:
These two should be removed from package id calculation, see `package_id`.
##########
libs/framework/include/celix/Trackers.h:
##########
@@ -217,18 +217,19 @@ namespace celix {
*/
class GenericServiceTracker : public AbstractTracker {
public:
+#if __cplusplus >= 201703L //C++17 or higher
GenericServiceTracker(std::shared_ptr<celix_bundle_context_t> _cCtx,
std::string_view _svcName,
std::string_view _svcVersionRange, celix::Filter
_filter) : AbstractTracker{std::move(_cCtx)}, svcName{_svcName},
svcVersionRange{_svcVersionRange}, filter{std::move(_filter)} {
- opts.trackerCreatedCallbackData = this;
- opts.trackerCreatedCallback = [](void *data) {
- auto* trk = static_cast<GenericServiceTracker*>(data);
- {
- std::lock_guard<std::mutex> callbackLock{trk->mutex};
- trk->state = TrackerState::OPEN;
- }
- };
+ setupServiceTrackerOptions();
+ }
+#else
+ GenericServiceTracker(std::shared_ptr<celix_bundle_context_t> _cCtx,
std::string _svcName,
Review Comment:
Will universal reference make string_view unnecessary?
##########
libs/framework/include/celix/TrackerBuilders.h:
##########
@@ -42,9 +42,9 @@ namespace celix {
//NOTE private to prevent move so that a build() call cannot be
forgotten
ServiceTrackerBuilder(ServiceTrackerBuilder&&) noexcept = default;
public:
- explicit ServiceTrackerBuilder(std::shared_ptr<celix_bundle_context_t>
_cCtx, std::string_view _name) :
+ explicit ServiceTrackerBuilder(std::shared_ptr<celix_bundle_context_t>
_cCtx, std::string _name) :
Review Comment:
I think `ServiceTrackerBuilder(std::shared_ptr<celix_bundle_context_t>
_cCtx, std::string&& _name)`, which eliminator a constructor call, is better.
And the best solution I know is so called universal reference, from
Effective Modern C++, Item 25:
```C++
template<typename T>
explicit ServiceTrackerBuilder(std::shared_ptr<celix_bundle_context_t>
_cCtx, T&& _name) :
cCtx{std::move(_cCtx)},
name{std::forward<T>(_name)} {}
```
If `_name` is a plain C string, this will also work without extra
constructor calls.
This consideration should apply to several other places.
I also wonder if usage of universal reference will make string_view
unnecessary? See `Trackers.h` for an example.
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