为容器使用std :: scoped_allocator_adaptor'ed分配器时,为什么std :: pair和std :: tuple的行为不同?
std :: pair失败:
std::vector<std::pair<std::string, std::string>,
std::scoped_allocator_adaptor<std::allocator<std::pair<std::string, std::string>>>> v;
v.push_back(std::make_pair( "one", "two" )); // <--- does not compile
而std :: tuple工作
std::vector<std::tuple<std::string, std::string>,
std::scoped_allocator_adaptor<std::allocator<std::tuple<std::string, std::string>>>> v2;
v2.push_back(std::make_tuple("one", "two")); // <- no problem
这是否与std :: tuple具有uses_allocator而std_pair不具有这一事实有关?