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        Boost.Coroutine2 provides the class fixedsize_stack
        which models the stack-allocator concept. In contrast
        to protected_fixedsize_stack it does not append a guard
        page at the end of each stack. The memory is simply managed by std::malloc() and std::free().
      
#include <boost/context/fixedsize_stack.hpp> struct fixedsize_stack { fixedsize_stack(std::size_t size = traits_type::default_size()); stack_context allocate(); void deallocate( stack_context &); }
stack_context allocate()
      
              traits_type::minimum:size()
              <= size
              and ! traits_type::is_unbounded() &&
              ( traits_type::maximum:size() >= size).
            
              Allocates memory of at least size
              Bytes and stores a pointer to the stack and its actual size in sctx. Depending on the architecture
              (the stack grows downwards/upwards) the stored address is the highest/lowest
              address of the stack.
            
void deallocate( stack_context
        & sctx)
      
              sctx.sp is valid, traits_type::minimum:size() <= sctx.size and !
              traits_type::is_unbounded()
              && (
              traits_type::maximum:size()
              >= sctx.size).
            
Deallocates the stack space.