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szwolf

專注于C++技術,再用1年的時間努力學C++!
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STL學習之二:STL內(nèi)存工具(一)

??????用Traits進行類別推導,將類別選擇工作放到編譯期進行,利用重載提高效率。
??????下面的type_traits.h是我直接從SGI STL里Copy出來的。。。

#ifndef?TYPE_TRAITS_H
#define ?TYPE_TRAITS_H

// 為了了重載確定那些類弄型是不用析構的SGI?STl用了type_traits
// 并將一些Scale?type進行特例化
struct ?__true_type? {
}
;

struct ?__false_type? {
}
;

template?
< class ?_Tp >
struct ?__type_traits? {?
???typedef?__true_type?????this_dummy_member_must_be_first;

???typedef?__false_type????has_trivial_default_constructor;
???typedef?__false_type????has_trivial_copy_constructor;
???typedef?__false_type????has_trivial_assignment_operator;
???typedef?__false_type????has_trivial_destructor;
???typedef?__false_type????is_POD_type;
}
;

template
<>
struct ?__type_traits < bool > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < char > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < signed? char > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < unsigned? char > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < wchar_t > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;

template
<>
?
struct ?__type_traits < short > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < unsigned? short > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < int > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < unsigned? int > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < long > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < unsigned? long > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;

#ifdef?__STL_LONG_LONG
template
<>
?
struct ?__type_traits < long ? long > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;

?
struct ?__type_traits < unsigned? long ? long > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;

#endif ?/*?__STL_LONG_LONG?*/
template
<>
?
struct ?__type_traits < float > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < double > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < long ? double > ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;

template?
< class ?_Tp >
struct ?__type_traits < _Tp *> ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < char *> ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < signed? char *> ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < unsigned? char *> ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < const ? char *> ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < const ?signed? char *> ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;
template
<>
?
struct ?__type_traits < const ?unsigned? char *> ? {
???typedef?__true_type????has_trivial_default_constructor;
???typedef?__true_type????has_trivial_copy_constructor;
???typedef?__true_type????has_trivial_assignment_operator;
???typedef?__true_type????has_trivial_destructor;
???typedef?__true_type????is_POD_type;
}
;

#endif

以下是construct 和 destroy的實現(xiàn)
#ifndef?MEM_TOOlS_H
#define?MEM_TOOlS_H
#include?
"type_traits.h"
using?namespace?std;
namespace?SGI
{
????template
<typename?T1,?typename?T2>
????inline?
void?construct(T1*?p,?const?T2&?value)
????
{
????????
new(p)T1(value);
????}

????
????template
<typename?T>
????inline?
void?construct(T*?p)
????
{
????????
new(p)T();
????}


????template
<typename?T>
????
void?destroy(T*?p)
????
{
????????p
->~T();
????}


????template
<typename?ForwardIterator>
????inline?
void?destroy_aux(ForwardIterator?first,?ForwardIterator?last,?__false_type)
????
{
????????
for?(;?first?<?last;?++first)
????????????destroy(
&*first);

????????cout?
<<?"false?type"?<<?endl;
????}


????template
<typename?ForwardIterator>
????inline?
void?destroy_aux(ForwardIterator?first,?ForwardIterator?last,?__true_type)
????
{
????????cout?
<<?"true?type"?<<?endl;
????}


????template
<typename?ForwardIterator>
????inline?
void?destroy(ForwardIterator?first,?ForwardIterator?last)
????
{
????????_destroy(first,?last,?value_type(
*first));
????}


????template
<typename?ForwardIterator,?typename?T>
????inline?
void?_destroy(ForwardIterator?first,?ForwardIterator?last,?T*)
????
{
????????typedef?__type_traits
<T>::has_trivial_destructor?trivial_destructor;
????????destroy_aux(first,?last,?trivial_destructor());
????}


????inline?
void?destroy(char*,?char*)?
????
{
????????cout?
<<?"char*?type"?<<?endl;
????}

????inline?
void?destroy(wchar_t*,?wchar_t*)?
????
{
????????cout?
<<?"wchar_t*?type"?<<?endl;
????}
????

}


#endif

在main中對construct,destroy時行測試

//?mem_tools.cpp?:?定義控制臺應用程序的入口點。
//
/*
?*????模仿實現(xiàn)SGI?STL中的內(nèi)存工具
?*??szwolf?@?szu
?*??2006.08.07
?
*/

#include?
"stdafx.h"
#include?
"sgi_allocator.h"
#include?
<iostream>
#include?
<vector>
#include?
<algorithm>
#include?
"mem_tools.h"

class?mem_test
{
public:
????mem_test(
const?char*?msg)
????
{
????????cout?
<<?msg?<<?endl;
????}


????
~mem_test()
????
{
????????cout?
<<?"dead~~"?<<?endl;
????}

}
;

int?_tmain(int?argc,?_TCHAR*?argv[])
{
????
//????很郁悶為什么下面的代碼是錯的?
????
//????typedef?simple_alloc<mem_test,?SGI::alloc>?data_allcator;
????
//????mem_test*?t?=?data_allocator::allocate();

????SGI::simple_alloc
<mem_test,?SGI::alloc>?data_allocator;
????
????mem_test
*?t?=?data_allocator.allocate();

????SGI::construct(t,?
"come to live!");
????SGI::destroy(
&*t);

????SGI::simple_alloc
<char,?SGI::alloc>?char_alloc;
????
char?*p?=?char_alloc.allocate(133);
????strcpy(p,?
"hellow!");
????SGI::destroy(p,p
+8);
????char_alloc.deallocate(p,?
133);

????system(
"pause");
????
return?0;
}
實中用到的simple_alloc及sgi_allocator.h是上一篇隨筆里的東西。。。

posted on 2006-08-07 01:47 szwolf 閱讀(1066) 評論(0)  編輯 收藏 引用

青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品
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