Component_malloc_allocator< T > Class Template Reference

Component_malloc_allocator is a C++ STL memory allocator based on my_malloc/my_free. More...

#include <component_malloc_allocator.h>

Classes
struct	rebind

Public Types
typedef T	value_type
typedef size_t	size_type
typedef ptrdiff_t	difference_type
typedef T *	pointer
typedef const T *	const_pointer
typedef T &	reference
typedef const T &	const_reference

Public Member Functions
pointer	address (reference r) const
const_pointer	address (const_reference r) const
	Component_malloc_allocator (PSI_memory_key key)
template<class U >
	Component_malloc_allocator (const Component_malloc_allocator< U > &other)
template<class U >
Component_malloc_allocator &	operator= (const Component_malloc_allocator< U > &other)
pointer	allocate (size_type n, const_pointer=nullptr)
void	deallocate (pointer p, size_type)
template<class U , class... Args>
void	construct (U *p, Args &&...args)
void	destroy (pointer p)
size_type	max_size () const
PSI_memory_key	psi_key () const

Private Attributes
PSI_memory_key	m_key

Detailed Description

template<class T = void *>
class Component_malloc_allocator< T >

Component_malloc_allocator is a C++ STL memory allocator based on my_malloc/my_free.

This allows for P_S instrumentation of memory allocation done internally by STL container classes in components.

Example usage: vector<int, Component_malloc_allocator<int>> v((Component_malloc_allocator<int>(PSI_NOT_INSTRUMENTED)));

If the type is complicated, you can just write Component_malloc_allocator<>(psi_key) as a shorthand for Component_malloc_allocator<My_complicated_type>(psi_key), as all Component_malloc_allocator instances are implicitly convertible to each other and there is a default template parameter.

Note

allocate() throws std::bad_alloc() similarly to the default STL memory allocator. This is necessary - STL functions which allocates memory expects it. Otherwise these functions will try to use the memory, leading to segfaults if memory allocation was not successful.

This allocator cannot be used for std::basic_string with RHEL 6/7 because of this bug: https://bugzilla.redhat.com/show_bug.cgi?id=1546704 "Define _GLIBCXX_USE_CXX11_ABI gets ignored by gcc in devtoolset-7"

Member Typedef Documentation

const_pointer

template<class T = void *>

typedef const T* Component_malloc_allocator< T >::const_pointer

const_reference

template<class T = void *>

typedef const T& Component_malloc_allocator< T >::const_reference

difference_type

template<class T = void *>

typedef ptrdiff_t Component_malloc_allocator< T >::difference_type

pointer

template<class T = void *>

typedef T* Component_malloc_allocator< T >::pointer

reference

template<class T = void *>

typedef T& Component_malloc_allocator< T >::reference

size_type

template<class T = void *>

typedef size_t Component_malloc_allocator< T >::size_type

value_type

template<class T = void *>

typedef T Component_malloc_allocator< T >::value_type

Constructor & Destructor Documentation

Component_malloc_allocator() [1/2]

template<class T = void *>

Component_malloc_allocator< T >::Component_malloc_allocator ( PSI_memory_key  key )

inlineexplicit

Component_malloc_allocator() [2/2]

template<class T = void *>

template<class U >

Component_malloc_allocator< T >::Component_malloc_allocator ( const Component_malloc_allocator< U > &  other )

inline

Member Function Documentation

address() [1/2]

template<class T = void *>

const_pointer Component_malloc_allocator< T >::address ( const_reference  r ) const

inline

address() [2/2]

template<class T = void *>

pointer Component_malloc_allocator< T >::address ( reference  r ) const

inline

allocate()

template<class T = void *>

pointer Component_malloc_allocator< T >::allocate ( size_type  n, const_pointer  = nullptr  )

inline

construct()

template<class T = void *>

template<class U , class... Args>

void Component_malloc_allocator< T >::construct ( U *  p, Args &&...  args  )

inline

deallocate()

template<class T = void *>

void Component_malloc_allocator< T >::deallocate ( pointer  p, size_type    )

inline

destroy()

template<class T = void *>

void Component_malloc_allocator< T >::destroy ( pointer  p )

inline

max_size()

template<class T = void *>

size_type Component_malloc_allocator< T >::max_size ( ) const

inline

operator=()

template<class T = void *>

template<class U >

Component_malloc_allocator & Component_malloc_allocator< T >::operator= ( const Component_malloc_allocator< U > &  other )

inline

psi_key()

template<class T = void *>

PSI_memory_key Component_malloc_allocator< T >::psi_key ( ) const

inline

Member Data Documentation

m_key

template<class T = void *>

PSI_memory_key Component_malloc_allocator< T >::m_key

private

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

• include/mysql/components/library_mysys/component_malloc_allocator.h