C++学习笔记3--一些应用

返回类型 函数名(形式参数表)
{
    ...     //函数体
}

template <class type>
type Sum(type xvar, type yvar) {
    return xvar + yvar;
}

#include <iostream>
using namespace std;
template <class type,int len>   //定义一个模板类型
type Max(type array[len]) {     //定义函数模板
    type ret = array[0];
    for(int i=1;i<len;i++) {
        ret = ret > array[i] ? ret : array[i];
    }
    return ret;
}
int main(int argc,char* argv[]) {
    int array[5] = {1,2,3,4,5}; //定义一个整型数组
    int iret = Max<int,5>(array);   //调用函数模板Max
    double dset[3] = {1.2, 3.45, 6.789}; //定义实数数组
    double dret = Max<double,3>(dset);  //调用函数模板Max
    cout << dret << endl;
    return 0;
}

#include <iostream>
#include <cstring>
using namespace std;
template<class type>
type Min(type a, type b) { //定义函数模板
    return a < b ? a : b;
}
char* Min(char* a, char* b) { //重载函数模板
    if(strcmp(a, b) < 0) return a;
    return b;
}
int main(int argc, char* argv[]) {
    cout << Min(10, 3) << endl;
    cout << Min('a','b') << endl;
    cout << Min("lasolmi","hello world") << endl;
    return 0;
}

template<template<class A> class B>
class CBase {
private:
    B<int> m_n;
};

emplate<class T>
class CDerived : public T
{
public:
    CDrived();
};
template<class T>
CDerived<T>::CDerived(): T() {
    cout << :: <<endl;
}
int main(int argc,char* argv[]) {
    CDerived<CBase1> D1;
    return 0;
}

#include <iostream>
using namespace std;
template<class T1, class T2>
class MyTemplate {
    T1 t1;
    T2 t2;
public:
    MyTemplate(T1 tt1, T2 tt2) {t1 = tt1; t2 = tt2;}
    void display() {cout << t1 << " " << t2 <<endl;}
};
int main(int argc, char* argv[]) {
    int a = 123;
    double b = 3.14159;
    MyTemplate<int,double> mt(a, b);
    mt.display();
    return 0;
}

#icnlude <cassert>
template<class T, int b>
class Array {
    T& operator[] (int sub) {
        return sub >=0 && sub < b;
    }
};

#include <cstdio>
class CBase {   //基类
public:
    virtual char * GetName() = 0;   //虚方法
};
class CBint : public CBase {
public:
    char * GetName() {return "CBint";}
    int GetInt() {return 1;}
};
class CBString : public CBase {
public:
    char * GetName() {return "CBString";}
    char * GetString() {return "Hello";}
};
int main(int argc, char* argv[]) {
    CBase* B1 = (CBase*)new CBint();
    printf(B1->GetName());
    CBint* B2 = static_cast<CBint*>(B1);    //静态替换
    if(B2) printf("%d" , B2->GetInt());
    CBase* C1 = (CBase*)new CBString();
    printf(C1->GetName());
    CBString* C2 = static_cast<CBString*>(C1);
    if(C2) printf(C2->GetString());
    return 0;
}

#include <iostream>
#include <cstring>
using namespace std;
class CCustomError {
private:
    int m_ErrorID;
    char m_Error[255];
public:
    CCustomError(int ErrorID, char* Error) {
        m_ErrorID = ErrorID;
        strcpy(m_Error, Error);
    }
    int GetErrorID() {return m_ErrorID;}
    char* GetError() {return m_Error;}
};
int main(int argc, char* argv[]) {
    try {
        throw (new CCustomError(1,"出现异常!"));
    } catch(CCustomError* error) {
        //输出异常信息
        cout << "异常ID:" << error->GetErrorID() <<endl;
        cout << "异常信息:" << error->GetError() << endl;
    }
    return 0;
}

int main(int argc, char* argv[]) {
    try {
        throw "字符串异常";
    } catch (CCustomError* error) {
        //输出异常信息
        cout << "异常ID:" << error->GetErrorID() <<endl;
        cout << "异常信息:" << error->GetError() << endl;
    } catch (char* error) {
        cout << "异常信息:" << error << endl;
    } catch (...) {
        cout << "未知异常信息" << endl;
    }
    return 0;
}

namespace std
{
    //exception 派生
    class logic_error;
    //logic_error 派生
    class domain_error;
    class invalid_argument;
    class length_error;
    class out_of_range;
    class bad_cast;
    class bad_typeid;
    //exception 派生
    class runtime_error;
    //runtime_errot 派生
    class range_error;
    class overflow_error;
    class bad_alloc;
}

C++学习笔记3--一些应用

原文：http://blog.csdn.net/lasolmi/article/details/40556489