//
// Created by william on 2021/4/17.
//
#include "base.h"
using namespace std;
#define STR(T) #T
#define DEBUG_PRINT_THIS(T) \
T() \
{ \
printf("constructor of %s is called for (%p).\n", STR(T), this); \
} \
~T() \
{ \
printf("destructor of %s is called for (%p).\n", STR(T), this); \
}
/// SDK-G
// G的代ç ，编译时ä¸ä¾èµ–任何F的内容
class G
{
// 通过回调函数æ¥è°ƒç”¨Fä¸æ供的功能(ä¸å¼•å…¥F的文件ã€ä¹Ÿä¸äº§ç”Ÿç¼–译ä¾èµ–)
std::function<:string std::string name> m_readFileFunc;
public:
void setFunc(std::function<:string std::string name> func)
{
m_readFileFunc = func;
}
DEBUG_PRINT_THIS(G);
};
/// SDK-F
class FConfig
{
public:
// FConfig的一些公用函数(å¯èƒ½æ¥è‡ªäºŽå…¶ä»–SDK)
std::function<:string std::string> _readFileFunc;
std::shared_ptr m_pG; // 出于æŸäº›éœ€æ±‚，需è¦é€šè¿‡FConfigæ¥ä¼ 递G的对象。
std::string readFile(const std::string& name)
{
assert(_readFileFunc);
return _readFileFunc(name);
}
DEBUG_PRINT_THIS(FConfig);
};
class F
{
public:
void createG(const std::shared_ptr& config)
{
assert(config.use_count() == 1); // å¼•ç”¨ä¼ é€’config，ä¸äº§ç”Ÿæ‹·è´ã€å¼•ç”¨è®¡æ•°ä¸æ›´æ”¹
m_pG = std::make_shared();
m_pG->setFunc(
[&config](const std::string& name)->std::string
{
assert(config);
return config->readFile(name);
}
);
assert(config.use_count() == 1);
}
void init()
{
std::shared_ptr config = std::make_shared();
// æ¤å¤„çœç•¥å¯¹configçš„åˆå§‹åŒ–
assert(config.use_count() == 1);
createG(config);
assert(config.use_count() == 1);
config->m_pG = m_pG;
assert(m_pG.use_count() == 2);
config.reset();
assert(config == nullptr); // 实际未调用FConfigçš„æžæž„函数。
assert(m_pG.use_count() == 1); // pG引用计数应该为1ã€å®žé™…为2.
}
DEBUG_PRINT_THIS(F);
private:
std::shared_ptr m_pG;
};
/// APP
void lambdaErrorTest()
{
auto f = std::make_shared();
f->init();
f.reset(); // æ¤æ—¶ï¼ŒGå’ŒFConfigçš„æžæž„函数没有调用
}
/*
以下为程åºè¾“出
constructor of F is called for (0x95de80).
constructor of FConfig is called for (0x95eec0).
constructor of G is called for (0x95ef10).
destructor of F is called for (0x95de80).
*/