C++ decrement函数代码示例

int power(struct NUMBER *a,struct NUMBER *b,struct NUMBER *c)
{
	int res = 0;
	struct NUMBER tmp_b,tmp_c,tmp;

	if(isZero(b) == 0)//bが最初から0ならば
	{
		setInt(c,1);//cを1に
		return(0);//n^0は(0を除いて)必ず1になるため
	}

	if(getSign(b) == -1)//bが負なら
		return(-1);

	copyNumber(b,&tmp_b);//bが破壊されないようにtmp_bに
	copyNumber(a,c);//aをcにコピー、cの初期値をaとする

	copyNumber(&tmp_b,&tmp);//tmp_bにtmpを代入、グダグダなのはわかってる。
	decrement(&tmp,&tmp_b);//もうすでにcにはa^1があるので、1をまず引く

	while(1)
	{
		if(isZero(&tmp_b) == 0)
			break;//bが0になったら終了
		copyNumber(c,&tmp_c);//tmp_cに現在のcの値を代入する
		res = multiple(a,&tmp_c,c);
		if(res == -1)
			break;
		
		copyNumber(&tmp_b,&tmp);//tmp_bにtmpを代入、グダグダなのはわかってる。
		decrement(&tmp,&tmp_b);//tmp_b--;を実行してます
	}
	return(res);
}

double FIRFilter(TRMFIRFilter *filter, double input, int needOutput)
{
    if (needOutput) {
	int i;
	double output = 0.0;

	/*  PUT INPUT SAMPLE INTO DATA BUFFER  */
	filter->FIRData[filter->FIRPtr] = input;

	/*  SUM THE OUTPUT FROM ALL FILTER TAPS  */
	for (i = 0; i < filter->numberTaps; i++) {
	    output += filter->FIRData[filter->FIRPtr] * filter->FIRCoef[i];
	    filter->FIRPtr = increment(filter->FIRPtr, filter->numberTaps);
	}

	/*  DECREMENT THE DATA POINTER READY FOR NEXT CALL  */
	filter->FIRPtr = decrement(filter->FIRPtr, filter->numberTaps);

	/*  RETURN THE OUTPUT VALUE  */
	return output;
    } else {
	/*  PUT INPUT SAMPLE INTO DATA BUFFER  */
	filter->FIRData[filter->FIRPtr] = input;

	/*  ADJUST THE DATA POINTER, READY FOR NEXT CALL  */
	filter->FIRPtr = decrement(filter->FIRPtr, filter->numberTaps);

	return 0.0;
    }
}

double
FIRFilter::filter(double input, int needOutput)
{
	if (needOutput) {
		int i;
		double output = 0.0;

		/*  PUT INPUT SAMPLE INTO DATA BUFFER  */
		data_[ptr_] = input;

		/*  SUM THE OUTPUT FROM ALL FILTER TAPS  */
		for (i = 0; i < numberTaps_; i++) {
			output += data_[ptr_] * coef_[i];
			ptr_ = increment(ptr_, numberTaps_);
		}

		/*  DECREMENT THE DATA POINTER READY FOR NEXT CALL  */
		ptr_ = decrement(ptr_, numberTaps_);

		/*  RETURN THE OUTPUT VALUE  */
		return output;
	} else {
		/*  PUT INPUT SAMPLE INTO DATA BUFFER  */
		data_[ptr_] = input;

		/*  ADJUST THE DATA POINTER, READY FOR NEXT CALL  */
		ptr_ = decrement(ptr_, numberTaps_);

		return 0.0;
	}
}

    /**
     * @brief push_front
     */
    void push_front(const T& val)
    {
        assert(!full());

        if(head == c.end())
            head = decrement(head);

        *head = val;
        head = decrement(head);
    }

void CompilerStubs::generate_compiler_new_object() {
  comment_section("Compiler new object (any size)");
  comment("Register edx holds the instance size, register ebx holds the prototypical near of the instance class");
  Label slow_case;
  entry("compiler_new_object");

  comment("Get _inline_allocation_top");
  movl(eax, Address(Constant("_inline_allocation_top")));

  comment("Compute new top");
  leal(ecx, Address(eax, edx, times_1));

  if (GenerateDebugAssembly) {
    comment("Check ExcessiveGC");
    testl(Address(Constant("ExcessiveGC")), Constant(0));
    jcc(not_zero, Constant(slow_case));
  }

  comment("Compare against _inline_allocation_end");
  cmpl(ecx, Address(Constant("_inline_allocation_end")));
  jcc(above, Constant(slow_case));

  comment("Allocation succeeded, set _inline_allocation_top");
  movl(Address(Constant("_inline_allocation_top")), ecx);

  comment("Set prototypical near in object; no need for write barrier");
  movl(Address(eax), ebx);

  comment("Compute remaining size");
  decrement(edx, oopSize);

  comment("One-word object?");
  Label init_done;
  jcc(zero, Constant(init_done));

  comment("Zero object fields");
  xorl(ecx, ecx);
  Label init_loop;
  bind(init_loop);
  movl(Address(eax, edx, times_1), ecx);
  decrement(edx, oopSize);
  jcc(not_zero, Constant(init_loop));
  bind(init_done);

  comment("The newly allocated object is in register eax");
  ret();

  comment("Slow case - call the VM runtime system");
  bind(slow_case);
  leal(eax, Address(Constant("newobject")));
  goto_shared_call_vm(T_OBJECT);

  entry_end(); // compiler_new_object
}

FFEvent* TimeTable::getUpcomingEvent(){
	FFEvent* upEvent = head;
	if ( size() > 1 ) {
		setHead(head->getNext());
		decrement();
	} else if ( size() == 1 ) {
		// this is the only event left
		decrement();
	} else {
		// no events left to be treated (size=0)
		cout << "ForeFire simulation ended with no more event to be treated" << endl;
		upEvent = 0;
	}
	return upEvent;
}

int main()
{
    int i = 0;
    std::string str = "asdf";

    decrement(i);
    decrement(str);

    std::cout << i << " "<<str<<std::endl;

    F foo;
    foo.decrement(i);
    foo.decrement(str);
    std::cout << i << " "<<str<<std::endl;
}

 void pop_back()
 {
     MGBASE_ASSERT(!empty());
     --size_;
     
     decrement(&last_);
 }

		void advance(difference_type dist)
		{
			for (; dist != 0; --dist)
				{
					decrement();
				}
		}

void Demo::DepthZoom::on_incNear_pressed() {
    float z = increment(mN);
    float f = decrement(mF - mN);
    mN += z < f ? z : f;
    mUI->nearValue->setText(QString("%1").arg((double) mN, 0, 'f', 2, QChar('0')));
    emit valuesChanged(mN, mF);
}

void Task< Kokkos::Serial , void >::schedule_dependence_reserve(int n)
{
  if ( STATE_CONSTRUCTING != m_state && STATE_EXECUTING != m_state ) {
    throw std::runtime_error(std::string("Kokkos::Impl::Task spawn or respawn state error"));
  }

  m_state = STATE_WAITING ;

  for ( int i = 0 ; i < m_dep_count ; ++i ) {
    decrement( m_dep[i] );
    m_dep[i] = 0 ;
  }

  if ( DEP_COUNT_BASE < n && m_dep_alloc < n ) {
    if ( m_dep_alloc ) {
      // Thread safety and scalability of 'free' ?
      free( m_dep );
    }
    m_dep_alloc = n ;
    // Thread safety and scalability of 'malloc' ?
    m_dep = reinterpret_cast<Task**>( malloc( n * sizeof(Task*) ) );

    for ( int i = 0 ; i < m_dep_alloc ; ++i ) { m_dep[i] = 0 ; }
  }

  m_dep_count = n ;
}

long IOPMchangeNoteList::previousChangeNote ( unsigned long ordinal )
{
    if ( ordinal == firstInList )  {
        return -1;
    }
    return decrement(ordinal);
}

// Arbitrary-size push function
unsigned int pushToBuffer(buffer_t *b, void *d, unsigned int l) {
    unsigned int elementIndex, byteIndex;
    
    // Loop through all elements
    for (elementIndex = 0; elementIndex < l; elementIndex++) {

        // Loop through all bytes of each element
        for (byteIndex = 0; byteIndex < b->width; byteIndex++) {
        
            // Only push to buffer if it is not full or overwriting is allowed
            if ( (!isBufferFull(b)) || (b->behavior.bits.overwrite) ) {
                pushByte(b, *( (unsigned char*)(d + elementIndex * (b->width) + byteIndex) ));
            }
            
            // If buffer is full, return a count of those elments not pushed
            else {
                
                // Pop all bytes of incomplete elements
                // -This should never run, but added just in case
                unsigned int failedbytes;
                for (failedbytes = byteIndex; failedbytes > 0; failedbytes--) {
                   
                    // If it is a queue pop comes from tail, so decrement head
                    decrement(b, &(b->head));
                }
                
                // Return a count of failed push operations
                // -Include partial pushes in count
                return l - elementIndex;
            }
        }
    }
    return 0;
}

FIT_TEST_CASE()
{
    constexpr auto f = fit::compose(increment(), decrement());
    static_assert(std::is_empty<decltype(f)>::value, "Compose function not empty");
    int r = f(3);
    FIT_TEST_CHECK(r == 3);
    FIT_STATIC_TEST_CHECK(f(3) == 3);
}

void CGUINumberControl::processLogic()
{
    GsPointingState &pointingState = gPointDevice.mPointingState;

    const bool hasPoint = mRect.HasPoint(pointingState.mPos);
    const bool bDown = (pointingState.mActionButton>0);

    const float xMid = mRect.x+(mRect.w/2.0f);

    mReleased = false;

    mDecSel = false;
    mIncSel = false;

    Vector2D<float> mousePos = pointingState.mPos;

    if( mousePos.x < xMid )
        mDecSel = true;
    else if( mousePos.x > xMid )
        mIncSel = true;


    if(!bDown && mPressed)
    {
        mPressed = false;

        if(hasPoint)
        {
            mReleased = true;
        }
    }

    if(!bDown || mPressed)
    {
        mHovered = hasPoint;
    }

    if(mHovered && bDown)
    {
        mPressed = true;

        if( mDecSel )
        {
            // Cycle through the values -> go one value down
            if( mValue > mStartValue )
                decrement();
        }
        else if( mIncSel )
        {
            // Cycle through the values -> go one value up
            if( mValue < mEndValue )
                increment();
        }

        mMustRedraw = true;
    }

}