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CMap用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...高你的效率。CMap就是对Hash表的一种实现。先上实例：
int _tmain(int argc, char* argv[])
{
//定义
typedef CMap<int, int, CString, CString> CMapInt;
CMapInt map;
//添加key，val
map.SetAt(1, "str1");
map.SetAt(2, "str2");
map.SetAt(3, "str3");
map.SetAt...
c++ boost库 序列化与反序列化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...<typename Archive>void serialize(Archive& ar, TOrder & obj, const unsigned int ver...1、定义类/结构体序列化函数：
template <typename Archive>
void serialize(Archive& ar, TOrder & obj, const unsigned int version = SERIALIZATION_VERSION)
{
ar & BOOST_SERIALIZATION_NVP(obj.Pa...
register int i;的含义 - C/C++ - 清泛网 - 专注C/C++及内核技术
register int i;的含义register声明的作用是为了提高效率。它明确要求CPU把变量始终保存在寄存器里面，直至它消亡。不过现代编译器都很厉害，根本不需要你多此一...register声明的作用是为了提高效率。
它明确要求CPU把变量始终...
C/C++ 如何向上取整？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...向上取整？一般地，向上取整有两种方法：#include <math.h>int _tmain(int argc, _TCHAR* argv[]){int a = 6, b = 5; ceil函数printf("%d...一般地，向上取整有两种方法：
#include <math.h>
int _tmain(int argc, _TCHAR* argv[])
{
int a = 6, b = 5;
//ceil函数
p...
error C2780: \'void __cdecl std::sort(_RI,_RI,_Pr)\' : expects 3 argum...
...emplate parameter '_RI' is ambiguous could be 'class std::reverse_iterator<int *,int,int &,int *,int>' or 'int *'
代码如下：
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
void main()
{
vector<int> ivec1(10,1);
sort(ive...
...VC\\INCLUDE\\iterator(93) : error C2039: “push_front”: 不是“std...
...r(93) : error C2039: push_front:不是std::vector<_Ty>的成员 with [ _Ty=int ]错误代码：int ia[] = {1......VC\INCLUDE\iterator(93) : error C2039: “push_front”: 不是“std::vector<_Ty>”的成员
with
[
_Ty=int
]
错误代码：
int ia[] = {1,...
编译错误 error: ISO C++ forbids declaration of ‘xxx’ with no type [-...
...。 ifndef ttTree_h define ttTree_hclass ttTree {public: ttTree(void); int ttTreeInsert(int value 比较可能的情况1：函数没有写返回类型，加上返回类型后编译成功。
#ifndef ttTree_h
#define ttTree_h
class ttTree
{
public:
ttTree(void);
int ttTreeInsert(in...
How to rethrow the same exception in SQL Server
...nd try
begin catch
declare @ErrorMessage nvarchar(max), @ErrorSeverity int, @ErrorState int;
select @ErrorMessage = ERROR_MESSAGE() + ' Line ' + cast(ERROR_LINE() as nvarchar(5)), @ErrorSeverity = ERROR_SEVERITY(), @ErrorState = ERROR_STATE();
if @@trancount > 0 rollback transaction;
...
C++ Double Address Operator? (&&)
...
&& is new in C++11. int&& a means "a" is an r-value reference. && is normally only used to declare a parameter of a function. And it only takes a r-value expression. If you don't know what an r-value is, the simple explanation is...
What is size_t in C?
...a:
According to the 1999 ISO C standard
(C99), size_t is an unsigned integer
type of at least 16 bit (see sections
7.17 and 7.18.3).
size_tis an unsigned data type
defined by several C/C++ standards,
e.g. the C99 ISO/IEC 9899 standard,
that is defined in stddef.h.1 It can
be f...