[{"type":"CodeBlock","activeTabIndex":0,"children":[{"type":"CodeTab","language":"cpp","name":"","children":[{"text":"// send action - generic support for arbitrary function signatures and arguments\ntemplate \nTestMachine& Send(F&& f, Args&&... args) // used for l2SrbReceptionBuilder template function\n{\n static_assert(!st_detail::has_raw_string_arg_v,\n \"Raw string arguments are not allowed in Send()\");\n\n // Use std::bind to create a nullary callable from function + args\n AddAction(std::make_shared(std::bind(std::forward(f), std::forward(args)...)));\n return *this;\n}\n\n// send action with srbId/isChecked prefix - generic support\ntemplate \nTestMachine& Send(F&& f, uint8_t srbId, bool isChecked, Args&&... args)\n{\n static_assert(!st_detail::has_raw_string_arg_v,\n \"Raw string arguments are not allowed in Send()\");\n\n AddAction(std::make_shared(\n std::bind(std::forward(f), srbId, isChecked, std::forward(args)...)));\n return *this;\n}\n\n上面的两个函数是重载函数，如果调用\nSend(l2SrbReceptionBuilder, 1, false, \"28824FC024AA145A800FC00BA220205E1E06C02000\")\n \n编译器会选择哪个重载函数?"}],"slateId":"9yUnpc7uxpnRuab-i4n1n"}],"slateId":"_khFw1DOLcT1zgS_PCpwm"},{"type":"Image","src":"https://pic.leetcode.cn/1779763434-vtcXpB-image.png","children":[{"text":""}],"slateId":"cBoK5F1quJeWGMlaJQZ0y"},{"type":"Paragraph","children":[{"text":""}],"slateId":"So5kQny1mvAeAoNk8PvvL"},{"type":"Paragraph","slateId":"73jgWv1EJZkkNoysrHDoS","children":[{"text":"但其实我们的期望是编译器能够匹配第二个重载函数。为了达到这个目的，我们调整代码如下："}]},{"type":"CodeBlock","activeTabIndex":0,"children":[{"type":"CodeTab","language":"cpp","name":"","children":[{"text":"//重载函数3，精准匹配整数字面量的int类型\ntemplate \nTestMachine& Send(F&& f, int srbId, bool isChecked, Args&&... args)\n{\n static_assert(!st_detail::has_raw_string_arg_v,\n \"Raw string arguments are not allowed in Send()\");\n\n AddAction(std::make_shared(\n std::bind(std::forward(f), static_cast(srbId), isChecked,\n std::forward(args)...)));\n return *this;\n}\n\n// 重载函数4，模糊匹配所有的整型，比如uint8_t, short, long\ntemplate >, int> = 0>\nTestMachine& Send(F&& f, SrbIdT srbId, bool isChecked, Args&&... args)\n{\n static_assert(!st_detail::has_raw_string_arg_v,\n \"Raw string arguments are not allowed in Send()\");\n\n AddAction(std::make_shared(\n std::bind(std::forward(f), static_cast(srbId), isChecked,\n std::forward(args)...)));\n return *this;\n}\n\n上面的两个函数是重载函数，如果调用\nSend(l2SrbReceptionBuilder, 1, false, \"28824FC024AA145A800FC00BA220205E1E06C02000\")"}],"slateId":"bigaRggnmP9gCSI2KCFGI"}],"slateId":"aN-6pCu5cc3SJ0hrfD1Ic"},{"type":"Paragraph","children":[{"text":"上面的两个重载函数，在编译器进行重载函数决议的时候，是不是完全等价的呢？"}],"slateId":"iQ3WQUGw4MhncIZ8YNGkI"},{"type":"Image","src":"https://pic.leetcode.cn/1779762440-RpeGth-image.png","children":[{"text":""}],"slateId":"_ocW0sFgLzTOCcSmPFRM2"},{"type":"Paragraph","children":[{"text":""}],"slateId":"dXwKmv5BrEzfVepiuQ7v0"},{"type":"Paragraph","slateId":"H1o42ZVC07MQ4uGqoBKpK","children":[{"text":"为什么重载函数3是多余的呢？"}]},{"type":"Paragraph","slateId":"6ycHBFbUjHa57dV6AkMUp","children":[{"text":"那么就需要理解重载函数4中的std::enable_if_t>, int> = 0的含义："}]},{"type":"Image","src":"https://pic.leetcode.cn/1779762774-pRiQtr-image.png","children":[{"text":""}],"slateId":"ojcZOGHN3RCuKPf_c5VTS","resizeWidth":757.8},{"type":"Paragraph","slateId":"SZV3kvJ4TEiKBJ9quzCQI","children":[{"text":""}]},{"type":"Paragraph","slateId":"xzoRzagIvyyuFM5E0ysKI","children":[{"text":"既然有std::is_integral_v>，这行代码中的int是不是多余的呢？"}]},{"type":"Image","src":"https://pic.leetcode.cn/1779763100-ToQvsS-image.png","children":[{"text":""}],"slateId":"o25BUeFHi_fp0Pz7STYyD"}]