67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
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#pragma once
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#ifdef DEBUG
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#include <cxxabi.h>
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#include <iostream>
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#include <string>
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#ifdef ANDROID
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#include <android/log.h>
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#endif
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namespace reanimated {
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// This is a class that counts how many instances of a different class there
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// are. It is meant only to be used with classes that should only have one
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// instance.
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template <class T>
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class SingleInstanceChecker {
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public:
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SingleInstanceChecker();
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~SingleInstanceChecker();
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private:
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void assertWithMessage(bool condition, std::string message) {
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if (!condition) {
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#ifdef ANDROID
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__android_log_print(
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ANDROID_LOG_WARN, "Reanimated", "%s", message.c_str());
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#else
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std::cerr << "[Reanimated] " << message << std::endl;
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#endif
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}
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}
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// A static field will exist separately for every class template.
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// This has to be inline for automatic initialization.
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inline static int instanceCount_;
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};
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template <class T>
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SingleInstanceChecker<T>::SingleInstanceChecker() {
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int status = 0;
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std::string className =
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__cxxabiv1::__cxa_demangle(typeid(T).name(), nullptr, nullptr, &status);
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// Only one instance should exist, but it is possible for two instances
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// to co-exist during a reload.
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assertWithMessage(
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instanceCount_ <= 1,
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"More than one instance of " + className +
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" present. This may indicate a memory leak due to a retain cycle.");
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instanceCount_++;
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}
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template <class T>
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SingleInstanceChecker<T>::~SingleInstanceChecker() {
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instanceCount_--;
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}
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} // namespace reanimated
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#endif // DEBUG
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