std::allocator<T>::allocator

Since C++20

// 1)
constexpr allocator() noexcept;
// 2)
constexpr allocator( const allocator& other ) noexcept;
// 3)
template< class U >
constexpr allocator( const allocator<U>& other ) noexcept;

Since C++11, Until C++20

// 1)
allocator() noexcept;
// 2)
allocator( const allocator& other ) noexcept;
// 3)
template< class U >
allocator( const allocator<U>& other ) noexcept;

Until C++11

// 1)
allocator() throw();
// 2)
allocator( const allocator& other ) throw();
// 3)
template< class U >
allocator( const allocator<U>& other ) throw();

Constructs the default allocator. Since the default allocator is stateless, the constructors have no visible effect.

Parameters

other - another allocator to construct with