Commit 963dd9a

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Create shared_ptr.cpp

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	`1`	`+#include <iostream>`
	`2`	`+#include <memory>`
	`3`	`+`
	`4`	`+class Rectangle {`
	`5`	`+public:`
	`6`	`+ Rectangle(int w, int h) : width(w), height(h) {}`
	`7`	`+ ~Rectangle() { std::cout << "Rectangle destructor" << std::endl; }`
	`8`	`+ int getArea() { return width * height; }`
	`9`	`+private:`
	`10`	`+ int width;`
	`11`	`+ int height;`
	`12`	`+};`
	`13`	`+`
	`14`	`+int main(){`
	`15`	`+ Rectangle* rectp = new Rectangle(5, 3);`
	`16`	`+ std::shared_ptr<Rectangle> rectsp1(rectp);`
	`17`	`+ std::shared_ptr<Rectangle> rectsp2(rectp);`
	`18`	`+ //rectsp1.reset(rectp);`
	`19`	`+ std::cout << rectsp1->getArea() << std::endl;`
	`20`	`+ return 0;`
	`21`	`+}`
	`22`	`+`
	`23`	`+/*`
	`24`	`+15`
	`25`	`+Rectangle destructor`
	`26`	`+Rectangle destructor`
	`27`	`+free(): double free detected in tcache 2`
	`28`	`+中止 (核心已傾印)`
	`29`	`+*/`

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