C++变量长度

最新推荐文章于 2024-06-15 22:38:46 发布

wangran51

最新推荐文章于 2024-06-15 22:38:46 发布

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本文对比了Windows和Linux环境下不同编译器（VC6, VC2005, GCC3.2.3, GCC3.4.6）在32位与64位系统中基础数据类型（如char, int, long等）和标准模板库容器（如string, vector, list, map等）的内存占用大小。

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	windows Vc6 (32bit)	Windows Vc2005 (32bit)	Redhat linux Gcc 3.2.3 32bit	Redhat linux Gcc 3.4.6 64bit
Char	1	1	1	1
Unsigned char	1	1	1	1
Char c[12]	12	12	12	12
Const char*	4	4	4	8
Short	2	2	2	2
Unsigned short	2	2	2	2
Int	4	4	4	4
Unsigned int	4	4	4	4
Long	4	4	4	8
Unsigned Long	4	4	4	8
String	16	32	4	8
Vector<string>	16	20	12	24
Vector<int>	16	20	12	24
Vector<short>	16	20	12	24
List<string>	12	24	4	16
List<int>	12	24	4	16
Map<string,int>	16	28	12	48
Map<int,int>	16	28	12	48
Map<short,string>	16	28	12	48

WINDOWS

VC6 32位

char: 1
unsigned char: 1
char c[12]: 12
const char*: 4
short: 2
unsigned short: 2
int: 4
unsigned int: 4
long: 4
unsigned long: 4
string: 16
vector<string>: 16
vector<int>: 16
vector<short>: 16
list<string>: 12
list<int>: 12
list<short>: 12
map<string,int>: 16
map<int,int>: 16
map<short,string>: 16

WINDOWS

VC2005 32位

char: 1
unsigned char: 1
char c[12]: 12
const char*: 4
short: 2
unsigned short: 2
int: 4
unsigned int: 4
long: 4
unsigned long: 4
string: 32
vector<string>: 20
vector<int>: 20
vector<short>: 20
list<string>: 24
list<int>: 24
list<short>: 24
map<string,int>: 28
map<int,int>: 28
map<short,string>: 28

linux 32位 redhat

gcc:3.2.3 20030502 (Red Hat Linux 3.2.3-47)

char: 1
unsigned char: 1
char c[12]: 12
const char*: 4
short: 2
unsigned short: 2
int: 4
unsigned int: 4
long: 4
unsigned long: 4
string: 4
vector<string>: 12
vector<int>: 12
vector<short>: 12
list<string>: 4
list<int>: 4
list<short>: 4
map<string,int>: 12
map<int,int>: 12
map<short,string>: 12

linux 64位 redhat

gcc version 3.4.6 20060404 (Red Hat 3.4.6-10)

char: 1
unsigned char: 1
char c[12]: 12
const char*: 8
short: 2
unsigned short: 2
int: 4
unsigned int: 4
long: 8
unsigned long: 8
string: 8
vector<string>: 24
vector<int>: 24
vector<short>: 24
list<string>: 16
list<int>: 16
list<short>: 16
map<string,int>: 48
map<int,int>: 48
map<short,string>: 48