Boost Json Translation (zh_Hans)/Doc / Pages / Allocators / Storage Ptr (adoc)

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27 :57

	English A memory resource which allocates large blocks of memory and has a trivial 74/10000 · 74
28 :62

	English deallocate function. Allocated memory is not freed until the resource is destroyed, making it fast for parsing but not suited for performing modifications. 155/10000 · 155
29 :66

	English {ref_polymorphic_allocator} 27/10000 · 27
30 :66

	English An {req_Allocator} which uses a reference to a {ref_memory_resource} to 71/10000 · 71
31 :68

	English perform allocations. 20/10000 · 20
32 :70

	English <<ref_static_resource>> 23/10000 · 23
33 :70

	English A memory resource that uses a single caller provided buffer. No dynamic 71/10000 · 71
34 :72

	English allocations are used. This is fast for parsing but not suited for performing modifications. 91/10000 · 91
35 :75

	English <<ref_storage_ptr>> 19/10000 · 19
36 :75

	English A smart pointer through which a {ref_memory_resource} is managed and 68/10000 · 68
37 :77

	English accessed. \|=== 14/10000 · 14
38 :80

	English Default Memory Resource 23/10000 · 23
39 :81

	English The default memory resource uses the global `operator new` and `operator delete` to allocate memory. This resource is not reference counted and has a non-trivial deallocate function. All default-constructed <<ref_storage_ptr>> objects reference the same memory resource: 270/10000 · 270
40 :91

	English Default-constructed library containers use the default memory resource: 71/10000 · 71
41 :98

	English The default memory resource is well suited for general usage. It offers reasonable performance for parsing, and conservative memory usage for modification of the contents of containers. 185/10000 · 185
42 :103

	English This memory resource is not guaranteed to be the same as the result of `boost::container::pmr::get_default_resource`. It also cannot be changed with `boost::container::pmr::set_default_resource`. 195/10000 · 195
43 :107

	English Monotonic Resource 18/10000 · 18
44 :108

	English Consider the pattern of memory allocation during parsing: when an array, object, or string is encountered the parser accumulates elements in its temporary storage area. When all of the elements are known, a single memory allocation is requested from the resource when constructing the value. Thus, parsing only allocates and constructs containers at their final size. Memory is not reallocated; that is, a memory buffer never needs to grow by allocating a new larger buffer and deallocating the previous buffer. 511/10000 · 511
45 :116

	English The <<ref_monotonic_resource>> optimizes this memory allocation pattern by allocating increasingly large blocks of global memory internally and parceling those blocks out in smaller pieces to fulfill allocation requests. It has a trivial deallocate function. The monotonic resource does not actually deallocate memory until the resource is destroyed. Thus, it is ideally suited for the use-case where JSON is parsed, and the resulting value is then inspected but not modified. 476/10000 · 476
46 :124

	English The resource to use when constructing values may be specified in calls to <<ref_parse>> as shown here: 102/10000 · 102

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