/usr/include/xsd/cxx/tree/buffer.hxx is in xsdcxx 4.0.0-1.
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// copyright : Copyright (c) 2005-2014 Code Synthesis Tools CC
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
/**
* @file
*
* @brief Contains a simple binary buffer abstraction that is used to
* implement the base64Binary and hexBinary XML Schema built-in types.
*
* This is an internal header and is included by the generated code. You
* normally should not include it directly.
*
*/
#ifndef XSD_CXX_TREE_BUFFER_HXX
#define XSD_CXX_TREE_BUFFER_HXX
#include <new> // operator new/delete
#include <cstddef> // std::size_t
#include <cstring> // std::memcpy, std::memcmp
#include <xsd/cxx/tree/exceptions.hxx>
namespace xsd
{
namespace cxx
{
/**
* @brief C++/Tree mapping runtime namespace.
*
* This is an internal namespace and normally should not be referenced
* directly. Instead you should use the aliases for types in this
* namespaces that are created in the generated code.
*
*/
namespace tree
{
//@cond
class buffer_base
{
protected:
virtual
~buffer_base ()
{
if (free_ && data_)
operator delete (data_);
}
buffer_base ()
: data_ (0), size_ (0), capacity_ (0), free_ (true)
{
}
protected:
char* data_;
size_t size_;
size_t capacity_;
bool free_;
};
//@endcond
/**
* @brief Simple binary %buffer abstraction
*
* The %buffer class manages a continuous binary %buffer. The base
* concepts are data (actual memory region), size (the portion of
* the %buffer that contains useful information), and capacity (the
* actual size of the underlying memory region). The bounds
* %exception is thrown from the constructors and modifier functions
* if the (size <= capacity) constraint is violated.
*
* Note that the template parameter is only used to instantiate
* %exception types. The underlying %buffer type is always @c char.
*
* @nosubgrouping
*/
template<typename C>
class buffer: protected buffer_base
{
public:
/**
* @brief Size type
*/
typedef std::size_t size_t;
public:
/**
* @name Constructors
*/
//@{
/**
* @brief Allocate a %buffer of the specified size.
*
* The resulting %buffer has the same size and capacity.
*
* @param size A %buffer size in bytes.
*/
explicit
buffer (size_t size = 0);
/**
* @brief Allocate a %buffer of the specified size and capacity.
*
* @param size A %buffer size in bytes.
* @param capacity A %buffer capacity in bytes.
* @throw bounds If @a size exceeds @a capacity
*/
buffer (size_t size, size_t capacity);
/**
* @brief Allocate a %buffer of the specified size and copy
* the data.
*
* The resulting %buffer has the same size and capacity with
* @a size bytes copied from @a data.
*
* @param data A %buffer to copy the data from.
* @param size A %buffer size in bytes.
*/
buffer (const void* data, size_t size);
/**
* @brief Allocate a %buffer of the specified size and capacity
* and copy the data.
*
* @a size bytes are copied from @a data to the resulting
* %buffer.
*
* @param data A %buffer to copy the data from.
* @param size A %buffer size in bytes.
* @param capacity A %buffer capacity in bytes.
* @throw bounds If @a size exceeds @a capacity
*/
buffer (const void* data, size_t size, size_t capacity);
/**
* @brief Reuse an existing %buffer.
*
* If the @a assume_ownership argument is true, the %buffer will
* assume ownership of @a data and will release the memory
* by calling @c operator @c delete().
*
* @param data A %buffer to reuse.
* @param size A %buffer size in bytes.
* @param capacity A %buffer capacity in bytes.
* @param assume_ownership A boolean value indication whether to
* assume ownership.
* @throw bounds If @a size exceeds @a capacity
*/
buffer (void* data,
size_t size,
size_t capacity,
bool assume_ownership);
/**
* @brief Copy constructor.
*
* The copy constructor performs a deep copy of the underlying
* memory %buffer.
*
* @param x An instance to make a copy of.
*/
buffer (const buffer& x);
//@}
public:
/**
* @brief Copy assignment operator.
*
* The copy assignment operator changes the buffer's capacity
* to @c x.capacity() and copies @c x.size() bytes from @a x.
*
* @param x An instance to assign.
* @return A reference to the instance.
*/
buffer&
operator= (const buffer& x);
public:
/**
* @brief Get buffer's capacity.
*
* @return A number of bytes that the %buffer can hold without
* reallocation.
*/
size_t
capacity () const
{
return capacity_;
}
/**
* @brief Set buffer's capacity.
*
* @param c The new capacity in bytes.
* @return True if the underlying %buffer has moved, false otherwise.
*/
bool
capacity (size_t c)
{
return this->capacity (c, true);
}
public:
/**
* @brief Get buffer's size.
*
* @return A number of bytes that the %buffer holds.
*/
size_t
size () const {return size_;}
/**
* @brief Set buffer's size.
*
* @param s The new size in bytes.
* @return True if the underlying %buffer has moved, false otherwise.
*/
bool
size (size_t s)
{
bool r (false);
if (s > capacity_)
r = capacity (s);
size_ = s;
return r;
}
public:
/**
* @brief Get the underlying memory region.
*
* @return A constant pointer to the underlying memory region.
*/
const char*
data () const {return data_;}
/**
* @brief Get the underlying memory region.
*
* @return A pointer to the underlying memory region.
*/
char*
data () {return data_;}
/**
* @brief Get the beginning of the underlying memory region.
*
* @return A constant pointer to the first byte of the underlying
* memory region.
*/
const char*
begin () const {return data_;}
/**
* @brief Get the beginning of the underlying memory region.
*
* @return A pointer to the first byte of the underlying memory
* region.
*/
char*
begin () {return data_;}
/**
* @brief Get the end of the underlying memory region.
*
* @return A constant pointer to the one past last byte of the
* underlying memory region (that is @c %begin() @c + @c %size() ).
*/
const char*
end () const {return data_ + size_;}
/**
* @brief Get the end of the underlying memory region.
*
* @return A pointer to the one past last byte of the underlying
* memory region (that is @c %begin() @c + @c %size() ).
*/
char*
end () {return data_ + size_;}
public:
/**
* @brief Swap data with another %buffer.
*
* @param x A %buffer to swap with.
*/
void
swap (buffer& x);
private:
bool
capacity (size_t capacity, bool copy);
};
/**
* @brief %buffer comparison operator.
*
* @return True if the buffers have the same sizes and the same
* data.
*/
template <typename C>
inline bool
operator== (const buffer<C>& a, const buffer<C>& b)
{
return a.size () == b.size () &&
std::memcmp (a.data (), b.data (), a.size ()) == 0;
}
/**
* @brief %buffer comparison operator.
*
* @return True if the buffers have different sizes or different
* data.
*/
template <typename C>
inline bool
operator!= (const buffer<C>& a, const buffer<C>& b)
{
return !(a == b);
}
}
}
}
#include <xsd/cxx/tree/buffer.txx>
#endif // XSD_CXX_TREE_BUFFER_HXX
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