SizeTrait Class Reference

#include "lib/meta/size-trait.hpp"

Description

A collection of constants to describe the expected size of some known classes, without needing to include the respective headers.

This is an optimisation to improve compilation times and/or reduce size of the generated object files in debug mode. To get those sizes computed in a fairly portable way, but without much overhead, we mimic the memory layout of "the real thing" with some reasonable simplifications:

• the size of vectors doesn't really depend on the elements
• our strings, streams and buffers use just simple chars

Interface

The purpose of this whole construction is to pull off some constants based on sizeof expressions:

• the size of a string
• the size of a vector
• the size of a boost::format

Warning

this setup is quite fragile and directly relies on the implementation layout of the GNU STL and Boost. Whenever using this stuff, make sure to place an assertion somewhere down in the implementation level to check against the size of the real thing.

Definition at line 77 of file size-trait.hpp.

Public Types
enum	{   ALIGNMENT = sizeof(size_t),   STRING = sizeof(std::string),   VECTOR = sizeof(Vector),   BVECTOR = sizeof(BVector),   BOOST_FORMAT = sizeof(BoostFormat) }

Classes
struct	BasicAltstringbuf
struct	BasicStringbuf
struct	BoostFormat
struct	CompatAllocator
struct	Locale
struct	Optional

Private Types
typedef std::vector< bool >	BVector
enum	IOS_Openmode {   _S_app = 1L << 0,   _S_ate = 1L << 1,   _S_bin = 1L << 2,   _S_in = 1L << 3,   _S_out = 1L << 4,   _S_trunc = 1L << 5,   _S_ios_openmode_end = 1L << 16 }
typedef std::vector< size_t >	Vector

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Class Documentation

lib::meta::SizeTrait::BoostFormat

struct lib::meta::SizeTrait::BoostFormat

Class Members
Vector	items_
BVector	bound_
int	style_
int	cur_arg_
int	num_args_
bool	dumped_
string	prefix_
unsigned char	exceptions
BasicAltstringbuf	buf_
Optional< Locale >	loc_

Collaboration diagram for SizeTrait::BoostFormat:

lib::meta::SizeTrait::Locale

struct lib::meta::SizeTrait::Locale

Class Members
void *	_M_impl

Collaboration diagram for SizeTrait::Locale:

lib::meta::SizeTrait::Optional

struct lib::meta::SizeTrait::Optional

Class Members
bool	m_initialized_
T	m_storage_

Inheritance diagram for SizeTrait::Optional< T >:

Collaboration diagram for SizeTrait::Optional< T >:

Collaboration diagram for SizeTrait:

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The documentation for this class was generated from the following file:

• size-trait.hpp