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Commit 18838bcf authored by Cody Heiner's avatar Cody Heiner
Browse files

Add `front` and `back` methods to RingBuffer 

Test: Corresponding added RingBuffer tests pass
(`atest libinput_tests`)

Bug: 268245099
Change-Id: If330940e67e70d809748b2aaa6156bed835c6c9d
parent 3704cb3b

include/input/RingBuffer.h

+5 −0
Original line number Diff line number Diff line
@@ -103,6 +103,11 @@ public: 
    iterator end() { return {*this, mSize}; }

    const_iterator end() const { return {*this, mSize}; }



    reference front() { return mBuffer[mBegin]; }

    const_reference front() const { return mBuffer[mBegin]; }

    reference back() { return mBuffer[bufferIndex(mSize - 1)]; }

    const_reference back() const { return mBuffer[bufferIndex(mSize - 1)]; }



    reference operator[](size_type i) { return mBuffer[bufferIndex(i)]; }

    const_reference operator[](size_type i) const { return mBuffer[bufferIndex(i)]; }

libs/input/tests/RingBuffer_test.cpp

+15 −0
Original line number Diff line number Diff line
@@ -118,6 +118,21 @@ TEST(RingBufferTest, Assignment) { 
    EXPECT_EQ(0u, d.capacity());

}



TEST(RingBufferTest, FrontBackAccess) {

    RingBuffer<int> buffer(/*capacity=*/2);

    buffer.pushBack(1);

    EXPECT_EQ(1, buffer.front());

    EXPECT_EQ(1, buffer.back());



    buffer.pushFront(0);

    EXPECT_EQ(0, buffer.front());

    EXPECT_EQ(1, buffer.back());



    buffer.pushFront(-1);

    EXPECT_EQ(-1, buffer.front());

    EXPECT_EQ(0, buffer.back());

}



TEST(RingBufferTest, Subscripting) {

    RingBuffer<int> buffer(/*capacity=*/2);

    buffer.pushBack(1);