(1) (since C++17)
explicit unsynchronized_pool_resource( std::pmr::memory_resource* upstream );
(2) (since C++17)
explicit unsynchronized_pool_resource( const std::pmr::pool_options& opts );
(3) (since C++17)
unsynchronized_pool_resource( const std::pmr::pool_options& opts,
                              std::pmr::memory_resource* upstream );
(4) (since C++17)
unsynchronized_pool_resource( const unsynchronized_pool_resource& ) = delete;
(5) (since C++17)

Constructs a unsynchronized_pool_resource.

1-4) Constructs an unsynchronized_pool_resource using the specified upstream memory resource and tuned according to the specified options. The resulting object holds a copy of upstream but does not own the resource to which upstream points.
The overloads not taking opts as a parameter uses a default constructed instance of pool_options as the options. The overloads not taking upstream as a parameter use the return value of std::pmr::get_default_resource() as the upstream memory resource.
5) Copy constructor is deleted.


opts - a std::pmr::pool_options struct containing the constructor options
upstream - the upstream memory resource to use


1-4) Throws only if a call to the allocate() function of the upstream resource throws. It is unspecified if or under what conditions such a call takes place.

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