Library: Foundation
Package: Core
Header: Poco/Buffer.h
A buffer class that allocates a buffer of a given type and size in the constructor and deallocates the buffer in the destructor.
This class is useful everywhere where a temporary buffer is needed.
Member Functions: append, assign, begin, capacity, capacityBytes, clear, empty, end, operator !=, operator =, operator ==, operator [], resize, setCapacity, size, sizeBytes, swap
Buffer(
std::size_t capacity
);
Creates and allocates the Buffer.
Buffer(
const Buffer & other
);
Copy constructor.
explicit Buffer(
T * pMem,
std::size_t length
);
Creates the Buffer. Length argument specifies the length of the supplied memory pointed to by pMem in the number of elements of type T. Supplied pointer is considered blank and not owned by Buffer, so in this case Buffer only acts as a wrapper around externally supplied (and lifetime-managed) memory.
explicit Buffer(
const T * pMem,
std::size_t length
);
Creates and allocates the Buffer; copies the contents of the supplied memory into the buffer. Length argument specifies the length of the supplied memory pointed to by pMem in the number of elements of type T.
~Buffer();
Destroys the Buffer.
void append(
const T * buf,
std::size_t sz
);
Resizes this buffer and appends the argument buffer.
void append(
T val
);
Resizes this buffer by one element and appends the argument value.
void append(
const Buffer & buf
);
Resizes this buffer and appends the argument buffer.
void assign(
const T * buf,
std::size_t sz
);
Assigns the argument buffer to this buffer. If necessary, resizes the buffer.
T * begin();
Returns a pointer to the beginning of the buffer.
const T * begin() const;
Returns a pointer to the beginning of the buffer.
std::size_t capacity() const;
Returns the allocated memory size in elements.
std::size_t capacityBytes() const;
Returns the allocated memory size in bytes.
void clear();
Sets the contents of the bufer to zero.
bool empty() const;
Return true if buffer is empty.
T * end();
Returns a pointer to end of the buffer.
const T * end() const;
Returns a pointer to the end of the buffer.
bool operator != (
const Buffer & other
) const;
Compare operator.
Buffer & operator = (
const Buffer & other
);
Assignment operator.
bool operator == (
const Buffer & other
) const;
Compare operator.
T & operator[] (
std::size_t index
);
const T & operator[] (
std::size_t index
) const;
void resize(
std::size_t newCapacity,
bool preserveContent = true
);
Resizes the buffer capacity and size. If preserveContent is true, the content of the old buffer is copied over to the new buffer. The new capacity can be larger or smaller than the current one; if it is smaller, capacity will remain intact. Size will always be set to the new capacity.
Buffers only wrapping externally owned storage can not be resized. If resize is attempted on those, IllegalAccessException is thrown.
void setCapacity(
std::size_t newCapacity,
bool preserveContent = true
);
Sets the buffer capacity. If preserveContent is true, the content of the old buffer is copied over to the new buffer. The new capacity can be larger or smaller than the current one; size will be set to the new capacity only if new capacity is smaller than the current size, otherwise it will remain intact.
Buffers only wrapping externally owned storage can not be resized. If resize is attempted on those, IllegalAccessException is thrown.
std::size_t size() const;
Returns the used size of the buffer in elements.
std::size_t sizeBytes() const;
Returns the used size of the buffer in bytes.
void swap(
Buffer & other
);
Swaps the buffer with another one.