function(allocator_arg_t,const_Alloc&,constfunction&); template<class_Alloc> function(allocator_arg_t,const_Alloc&,function&&); template<class_Fp,class_Alloc,class= _EnableIfCallable<_Fp>> function(allocator_arg_t,const_Alloc& __a, _Fp__f); #endif...
// C++ program for illustration// of std::allocator() function#include<iostream>#include<memory>#include<string>usingnamespacestd;intmain(){//allocatorfor string valuesallocator<string> myAllocator;// allocate space for three stringsstring* str = myAllocator.allocate(3);// construct these 3 str...
1. bind绑定一个函数指针还是绑定一个函数 这是有区别的.但是function都一样,function特化永远是需要一个函数类型.如下 auto b4 = std::bind(&RM, std::placeholders::_1, std::placeholders::_2); std::bind<void (__cdecl*)(int,std::vector<int,std::allocator<int> > &),std::_Ph<1> const ...
每个构造函数都有一个添加了std::allocator_arg_t作为第一个参数、内存分配器对象作为第二个参数的版本,C++17中已经移除(GCC从未提供,可能是因为std::function的内存分配无法自定义)。同样删除的还有assign,也是与内存分配器相关的。 另外有一个以std::reference_wrapper作为参数的赋值函数: template <typenameF>func...
~StlAlloc() =default;T *allocate(size_type n, std::allocator<void>::const_pointer hint=0){ std::cout << __FUNCTION__ <<" "<< n <<" "<<this<< std::endl;returnstatic_cast<T *>(operatornew(sizeof(T) * n)); }voiddeallocate(T *p, size_type n){operatordelete(p); ...
function& operator=(_Fp&&); ~function(); // function modifiers: void swap(function&) _NOEXCEPT; #if _LIBCPP_STD_VER <= 14 template<class _Fp, class _Alloc> _LIBCPP_INLINE_VISIBILITY void assign(_Fp&& __f, const _Alloc& __a) {function(allocator_arg, __a, _VSTD::forward<_Fp>...
function&operator=(_Fp&&); ~function(); // function modifiers: voidswap(function&)_NOEXCEPT; #if_LIBCPP_STD_VER <= 14 template<class_Fp,class_Alloc> _LIBCPP_INLINE_VISIBILITY voidassign(_Fp&& __f,const_Alloc& __a) {function(allocator_arg, __a, _VSTD::forward<_Fp>(__f)).swap...
(std::size_t,std::align_val_t)(since C++17), but it is unspecified when and how this function is called. The pointerhintmay be used to provide locality of reference: the allocator, if supported by the implementation, will attempt to allocate the new memory block as close as possible ...
// of std::allocator() function #include<iostream> #include<memory> #include<string> usingnamespacestd; intmain() { // allocator for string values allocator<string>myAllocator; // allocate space for three strings string*str=myAllocator.allocate(3); ...
& operator=(_Fp&&); ~function(); // function modifiers: void swap(function&) _NOEXCEPT; #if _LIBCPP_STD_VER 《= 14 template《class _Fp, class _Alloc》 _LIBCPP_INLINE_VISIBILITY void assign(_Fp&& __f, const _Alloc& __a) {function(allocator_arg, __a, _VSTD::forward《_Fp》(_...