std :: function vs function pointer 有什么不同吗? 哪种"保存/转移"功能最好? function<void(int)> fcn = [](intpar) {std::cout<<"fcn: "<<par<<std::endl; };void(*fcn_a)(int) = [](intpar) {std::cout<<"fcn_a: "<<par<<std::endl; }; fcn(12); fcn_a(12); Run Code ...
其实不止functor，STL六大组件全部都是这种思想下的产物，而function pointer和STL整体架构思想并不一致。
Class template std::function is a general-purpose polymorphic function wrapper. Instances of std::function can store, copy, and invoke any Callable target -- functions, lambda expressions, bind expressions, or other function objects, as well as pointers to member functions and pointers to data me...
可变参数函数格式:int fun(int a,...)
FooClass *myFoo = new FooClass(); void( FooClass::* oldFunc )(int) = &FooClass::Print; //C style function pointer (myFoo->*oldFunc)( 5 ); boost::function newFunc = boost::bind( &FooClass::Print, myFoo, _1 ); //boost function newFunc( 5 ); }版权...
*_M_function_pointer)(); // 接管普通函数指针 void (_Undefined_class::*_M_member_pointer...
pointer to object or to function lvalue reference to object or to function pointer to member object or to member function std::nullptr_t (since C++11) wrapper<f>() 中f是一个变量,它的值是运行期才能确定的。所以模板没办法编译通过,总不能等到运行时再Instantiate出一个wrapper<f>函数,让其中的i...
Invoking a pointer to a non-static data member is the same as dereferencing the pointer, when applied to the second argument. The statement std::invoke(&S::do_something, s); is therefore equivalent to s.do_something; which, despite its name, does nothing: It accesses the member and thro...
bool&) block_pointer) + 901 6 dyld 0x113aee59e invocation function for block in dyld4::Loader::forEachPath(Diagnostics&, dyld4::RuntimeState&, char const*, dyld4::Loader::LoadOptions const&, void (char const*, dyld4::ProcessConfig::PathOverrides::Type, bool&) block_pointer) + 134 ...
15: Compiling c10/core/Scalar.cpp failed: (Exit 1): gcc failed: error executing command (from target //c10/core:base) /opt/cache/bin/gcc -U_FORTIFY_SOURCE -fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer '-std=c++11' -MD -MF .....