是什么<false>意思？在"class ScopedBytesRW ： public ScopedBytes<false>"

代码中的<false>和<true>是什么意思？

我分析了 Android 系统文件读写的 JNI 实现，找到了以下C++代码。

我不知道在"class ScopedBytesRO： public ScopedBytes"中，<true>的含义是什么

谁能帮助我？

谢谢！

android-6.0.1-2.1.0\libnativehelper\includeativehelper\ScopedBytes.h

#ifndef SCOPED_BYTES_H_included
#define SCOPED_BYTES_H_included
#include "JNIHelp.h"
template<bool readOnly>
class ScopedBytes {
public:
    ScopedBytes(JNIEnv* env, jobject object)
    : mEnv(env), mObject(object), mByteArray(NULL), mPtr(NULL)
    {
        if (mObject == NULL) {
            jniThrowNullPointerException(mEnv, NULL);
        } else if (mEnv->IsInstanceOf(mObject, JniConstants::byteArrayClass)) {
            mByteArray = reinterpret_cast<jbyteArray>(mObject);
            mPtr = mEnv->GetByteArrayElements(mByteArray, NULL);
        } else {
            mPtr = reinterpret_cast<jbyte*>(mEnv->GetDirectBufferAddress(mObject));
        }
    }
    ~ScopedBytes() {
        if (mByteArray != NULL) {
            mEnv->ReleaseByteArrayElements(mByteArray, mPtr, readOnly ? JNI_ABORT : 0);
        }
    }
private:
    JNIEnv* mEnv;
    jobject mObject;
    jbyteArray mByteArray;
protected:
    jbyte* mPtr;
private:
    // Disallow copy and assignment.
    ScopedBytes(const ScopedBytes&);
    void operator=(const ScopedBytes&);
};
class ScopedBytesRO : public **ScopedBytes<true>** {
public:
    ScopedBytesRO(JNIEnv* env, jobject object) : **ScopedBytes<true>**(env, object) {}
    const jbyte* get() const {
        return mPtr;
    }
};
class ScopedBytesRW : public ScopedBytes<false> {
public:
    ScopedBytesRW(JNIEnv* env, jobject object) : **ScopedBytes<false>**(env, object) {}
    jbyte* get() {
        return mPtr;
    }
};
#endif  // SCOPED_BYTES_H_included