131 lines
4.2 KiB
C++
131 lines
4.2 KiB
C++
#ifndef FRAMEWORK_DATAPOOL_POOLENTRY_H_
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#define FRAMEWORK_DATAPOOL_POOLENTRY_H_
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#include "PoolEntryIF.h"
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#include <initializer_list>
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#include <type_traits>
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#include <cstddef>
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/**
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* @brief This is a small helper class that defines a single data pool entry.
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* @details
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* The helper is used to store all information together with the data as a
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* single data pool entry. The content's type is defined by the template
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* argument.
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*
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* It is prepared for use with plain old data types, but may be
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* extended to complex types if necessary. It can be initialized with a
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* certain value, size and validity flag.
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*
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* It holds a pointer to the real data and offers methods to access this data
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* and to acquire additional information (such as validity and array/byte size).
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* It is NOT intended to be used outside DataPool implementations as it performs
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* dynamic memory allocation.
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*
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* @ingroup data_pool
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*/
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template <typename T>
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class PoolEntry : public PoolEntryIF {
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public:
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static_assert(not std::is_same<T, bool>::value,
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"Do not use boolean for the PoolEntry type, use uint8_t "
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"instead! The ECSS standard defines a boolean as a one bit "
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"field. Therefore it is preferred to store a boolean as an "
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"uint8_t");
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/**
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* @brief In the classe's constructor, space is allocated on the heap and
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* potential init values are copied to that space.
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* @details
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* Not passing any arguments will initialize an non-array pool entry
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* (setLength = 1) with an initial invalid state.
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* Please note that if an initializer list is passed, the correct
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* corresponding length should be passed too, otherwise a zero
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* initialization will be performed with the given setLength.
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* @param initValue
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* Initializer list with values to initialize with, for example {0,0} to
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* initialize the two entries to zero.
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* @param setLength
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* Defines the array length of this entry. Should be equal to the
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* intializer list length.
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* @param setValid
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* Sets the initialization flag. It is invalid by default.
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*/
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PoolEntry(std::initializer_list<T> initValue = {}, uint8_t setLength = 1,
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bool setValid = false);
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/**
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* @brief In the classe's constructor, space is allocated on the heap and
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* potential init values are copied to that space.
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* @param initValue
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* A pointer to the single value or array that holds the init value.
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* With the default value (nullptr), the entry is initalized with all 0.
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* @param setLength
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* Defines the array length of this entry.
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* @param setValid
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* Sets the initialization flag. It is invalid by default.
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*/
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PoolEntry(T* initValue, uint8_t setLength = 1, bool setValid = false);
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//! Explicitely deleted copy ctor, copying is not allowed!
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PoolEntry(const PoolEntry&) = delete;
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//! Explicitely deleted copy assignment, copying is not allowed!
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PoolEntry& operator=(const PoolEntry&) = delete;
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/**
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* @brief The allocated memory for the variable is freed
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* in the destructor.
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* @details
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* As the data pool is global, this dtor is only called on program exit.
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* PoolEntries shall never be copied, as a copy might delete the variable
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* on the heap.
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*/
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~PoolEntry();
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/**
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* @brief This is the address pointing to the allocated memory.
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*/
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T* address;
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/**
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* @brief This attribute stores the length information.
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*/
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uint8_t length;
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/**
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* @brief Here, the validity information for a variable is stored.
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* Every entry (single variable or vector) has one valid flag.
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*/
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uint8_t valid;
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/**
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* @brief getSize returns the array size of the entry.
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* @details A single parameter has size 1.
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*/
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uint8_t getSize();
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/**
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* @brief This operation returns the size in bytes.
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* @details The size is calculated by sizeof(type) * array_size.
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*/
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uint16_t getByteSize();
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/**
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* @brief This operation returns a the address pointer casted to void*.
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*/
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void* getRawData();
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/**
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* @brief This method allows to set the valid information
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* of the pool entry.
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*/
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void setValid( bool isValid );
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/**
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* @brief This method allows to get the valid information
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* of the pool entry.
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*/
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bool getValid();
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/**
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* @brief This is a debug method that prints all values and the valid
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* information to the screen. It prints all array entries in a row.
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*/
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void print();
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Type getType();
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};
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#endif /* POOLENTRY_H_ */
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