Tools/TestWebKitAPI/Tests/WTF/LazyRef.cpp

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#include "config.h"

#include "RefLogger.h"
#include <wtf/LazyRef.h>
#include <wtf/RefPtr.h>

namespace TestWebKitAPI {

class LazyRefHolder {
public:
    LazyRefHolder(const char* name)
        : m_log(name)
        , m_ref(
            [](LazyRefHolder& holder, auto& ref) {
                ref.set(Ref { holder.m_log });
            })
    {
    }

    DerivedRefLogger& log() { return m_log; }
    RefLogger& ref() { return m_ref.get(*this); }
    RefLogger* refIfExists() { return m_ref.getIfExists(); }

private:
    DerivedRefLogger m_log;
    LazyRef<LazyRefHolder, RefLogger> m_ref;
};

TEST(WTF_LazyRef, Basic)
{
    {
        LazyRefHolder holder("a");
        EXPECT_EQ(holder.refIfExists(), nullptr);
        EXPECT_EQ(&holder.ref(), &holder.log());
        EXPECT_EQ(&holder.ref().name, &holder.log().name);
        EXPECT_EQ(holder.refIfExists(), &holder.log());
    }
    EXPECT_STREQ("ref(a) deref(a) ", takeLogStr().c_str());

    {
        LazyRefHolder holder("a");
    }
    EXPECT_STREQ("" , takeLogStr().c_str());
}

} // namespace TestWebKitAPI