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computed when the calculation is added to the store and don't change afterwards. Otherwise, if their heights change when scrolling (due to a modification of the display output type - ExactOnly, ApproximateOnly...), it generates crashes.
81 lines
3.4 KiB
C++
81 lines
3.4 KiB
C++
#ifndef CALCULATION_CALCULATION_STORE_H
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#define CALCULATION_CALCULATION_STORE_H
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#include "calculation.h"
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#include <apps/shared/expiring_pointer.h>
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#include <poincare/print_float.h>
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namespace Calculation {
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/* To optimize the storage space, we use one big buffer for all calculations.
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*
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* The previous solution was to keep 10 calculations, each containing 3 buffers
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* (for input and outputs). To optimize the storage, we then wanted to put all
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* outputs in a cache where they could be deleted to add a new entry, and
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* recomputed on cache miss. However, the computation depends too much on the
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* state of the memory for this to be possible. For instance:
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* 6->a
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* a+1
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* Perform some big computations that remove a+1 from the cache
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* Delete a from the variable box.
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* Scroll up to display a+1 : a does not exist anymore so the outputs won't be
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* recomputed correctly.
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*
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* Now we do not cap the number of calculations and just delete the oldests to
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* create space for a new calculation. */
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class CalculationStore {
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public:
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CalculationStore();
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Shared::ExpiringPointer<Calculation> calculationAtIndex(int i);
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typedef KDCoordinate (*CalculationHeight)(Calculation * c, bool expanded);
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Shared::ExpiringPointer<Calculation> push(const char * text, Poincare::Context * context, CalculationHeight height);
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void deleteCalculationAtIndex(int i);
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void deleteAll();
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int numberOfCalculations() const { return m_numberOfCalculations; }
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Poincare::Expression ansExpression(Poincare::Context * context);
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void tidy();
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private:
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static constexpr int k_maxNumberOfCalculations = 25;
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static constexpr int k_bufferSize = 10 * Calculation::k_numberOfExpressions * Constant::MaxSerializedExpressionSize;
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class CalculationIterator {
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public:
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CalculationIterator(const char * c) : m_calculation(reinterpret_cast<Calculation *>(const_cast<char *>(c))) {}
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Calculation * operator*() { return m_calculation; }
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bool operator!=(const CalculationIterator& it) const { return (m_calculation != it.m_calculation); }
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CalculationIterator & operator++() {
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m_calculation = m_calculation->next();
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return *this;
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}
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protected:
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Calculation * m_calculation;
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};
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CalculationIterator begin() const { return CalculationIterator(m_buffer); }
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CalculationIterator end() const { return CalculationIterator(m_bufferEnd); }
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Calculation * bufferCalculationAtIndex(int i);
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int remainingBufferSize() const { assert(m_bufferEnd >= m_buffer); return k_bufferSize - (m_bufferEnd - m_buffer); }
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bool pushSerializeExpression(Poincare::Expression e, char * location, char * * newCalculationsLocation, int numberOfSignificantDigits = Poincare::PrintFloat::k_numberOfStoredSignificantDigits);
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char * slideCalculationsToEndOfBuffer(); // returns the new position of the calculations
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size_t deleteLastCalculation(const char * calculationsStart = nullptr);
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const char * lastCalculationPosition(const char * calculationsStart) const;
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Shared::ExpiringPointer<Calculation> emptyStoreAndPushUndef(Poincare::Context * context, CalculationHeight height);
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char m_buffer[k_bufferSize];
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const char * m_bufferEnd;
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int m_numberOfCalculations;
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bool m_slidedBuffer;
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// Memoization
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static constexpr int k_numberOfMemoizedCalculationPointers = 10;
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void resetMemoizedModelsAfterCalculationIndex(int index);
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int m_indexOfFirstMemoizedCalculationPointer;
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mutable Calculation * m_memoizedCalculationPointers[k_numberOfMemoizedCalculationPointers];
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};
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}
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#endif
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