G4.9pool alloc用例

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#include <iostream>#include <vector>#include <ext\pool_allocator.h>using namespace std;template<typename Alloc>void cookie_test(Alloc alloc, size_t n) {typename Alloc::value_type *p1,*p2,*p3;p1 = alloc.allocate(n);p2 = alloc.allocate(n);p3 = alloc.allocate(n);cout << "p1= " << p1 << '\t' << "p2= " << p2 << '\t' << "p3= " << p3 << endl;alloc.deallocate(p1, sizeof(typename Alloc::value_type));alloc.deallocate(p2, sizeof(typename Alloc::value_type));alloc.deallocate(p3, sizeof(typename Alloc::value_type));}int main() {cout << sizeof(__gnu_cxx::__pool_alloc<int>) << endl;vector<int, __gnu_cxx::__pool_alloc<int> > vecPool;cookie_test(__gnu_cxx::__pool_alloc<double>(), 1);//相距08h（表示不带cookie） cout << endl;cout << sizeof(std::allocator<int>) << endl;vector<int, std::allocator<int> > vec;cookie_test(std::allocator<double>(), 1);//相距10h（表示带cookie）return 0;}

G4.9的allocator只是以::operator new和::operator delete完成allocate()和deallocate()，没有任何特殊设计

欲使用std::allocatoe以外的allocator，就得自行//include <ext/...>

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