60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
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/*
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* Copyright 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// Originally this class is from Chromium.
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// https://cs.chromium.org/chromium/src/base/android/jni_int_wrapper.h.
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#ifndef SDK_ANDROID_NATIVE_API_JNI_JNI_INT_WRAPPER_H_
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#define SDK_ANDROID_NATIVE_API_JNI_JNI_INT_WRAPPER_H_
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// Wrapper used to receive int when calling Java from native. The wrapper
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// disallows automatic conversion of anything besides int32_t to a jint.
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// Checking is only done in debugging builds.
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#ifdef NDEBUG
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typedef jint JniIntWrapper;
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// This inline is sufficiently trivial that it does not change the
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// final code generated by g++.
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inline jint as_jint(JniIntWrapper wrapper) {
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return wrapper;
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}
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#else
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class JniIntWrapper {
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public:
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JniIntWrapper() : i_(0) {}
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JniIntWrapper(int32_t i) : i_(i) {} // NOLINT(runtime/explicit)
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explicit JniIntWrapper(const JniIntWrapper& ji) : i_(ji.i_) {}
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jint as_jint() const { return i_; }
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// If you get an "invokes a deleted function" error at the lines below it is
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// because you used an implicit conversion to convert e.g. a long to an
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// int32_t when calling Java. We disallow this. If you want a lossy
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// conversion, please use an explicit conversion in your C++ code.
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JniIntWrapper(uint32_t) = delete; // NOLINT(runtime/explicit)
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JniIntWrapper(uint64_t) = delete; // NOLINT(runtime/explicit)
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JniIntWrapper(int64_t) = delete; // NOLINT(runtime/explicit)
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private:
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const jint i_;
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};
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inline jint as_jint(const JniIntWrapper& wrapper) {
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return wrapper.as_jint();
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}
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#endif // NDEBUG
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#endif // SDK_ANDROID_NATIVE_API_JNI_JNI_INT_WRAPPER_H_
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