82 lines
1.2 KiB
C++
82 lines
1.2 KiB
C++
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// 对象的存储
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// this 指针与链式编程(构造器模式)
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#include <iostream>
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#include <cstring>
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#include <cstdlib>
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using namespace std;
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class A
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{
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private:
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int a, b, c;
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public:
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void setA(int a)
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{
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this->a = a;
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}
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void setB(int b)
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{
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this->b = b;
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}
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void setC(int c)
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{
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this->c = c;
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}
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void show()
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{
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cout << "a = " << a << ", b = " << b << ", c = " << c << endl;
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}
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};
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class ABuilder
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{
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private:
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A *instance;
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public:
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ABuilder()
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{
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instance = new A();
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}
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~ABuilder()
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{
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if (instance != NULL)
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{
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cout << "~ABuilder()" << endl;
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delete instance;
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}
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}
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public:
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ABuilder &a(int a)
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{
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instance->setA(a);
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return *this;
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}
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ABuilder &b(int b)
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{
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instance->setB(b);
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return *this;
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}
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ABuilder &c(int c)
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{
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instance->setC(c);
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return *this;
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}
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A *build()
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{
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return instance;
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}
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};
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int main()
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{
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// 构建器设计模式: 构造产品，需要构造器一步一步的完成构造，最后 build() 出产品
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ABuilder builder;
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A *a1 = builder.a(1).b(3).c(8).build();
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a1->show();
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return 0;
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}
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