Exit Zen
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Contexts we used so far were empty classes. But contexts may have data members and member functions just as any class. Implementers of conversion functions can take advantage of that to have conversions configurable at runtime or pass special objects to conversions (e.g. allocators).
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This has the effect of finding user-provided `tag_invoke` overloads, even if they are declared (lexically) after the definition of the calling function.
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Internally, the container computes a hash table over the keys so that the complexity of lookups is in constant time, on average.
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A <<ref_value>> constructed from `nullptr` or default constructed represents a null JSON element:
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This lists all of the allocation-related types and functions available when using the library:
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A polymorphic allocator constructs with a pointer to a memory resource:
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include::{entities-file}[leveloffset=+1]
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<<ref_parser>>
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Up until now we have shown how values may be constructed from a memory resource pointer, where ownership is not transferred. In this case the caller is responsible for ensuring that the lifetime of the resource is extended for the life of the container. Sometimes you want the container to acquire shared ownership of the resource. This is accomplished with <<ref_make_shared_resource>>:
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https://rapidjson.org/classrapidjson_1_1_memory_pool_allocator.html[`MemoryPoolAllocator`], which is optimized for parsing without subsequent modification. The https://rapidjson.org/classrapidjson_1_1_generic_document.html[`Document`] object holding temporary memory is not reused between trials, otherwise memory consumption grows without bounds and invalidates the benchmark.
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declaration needlessly conflates parsing and serialization APIs.
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A stateful object which may be used to efficiently serialize one or more
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`bool`
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Status]] |https://drone.cpp.al/boostorg/json[image:https://drone.cpp.al/api/badges/boostorg/json/status.svg?ref=refs/heads/develop[Build Status]]
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<<ref_value>>
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More formally, `std::string` member function overloads that accept any of the following parameter combinations as an input string:
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Let's rewrite conversion for ``system_clock::time_point``s to allow any format supported by `std::strftime`.
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Overloads of `tag_invoke` called by <<ref_value_from>> take the form:
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For the complete listing of all available member functions and nested types, see the reference page for <<ref_object>>.
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The member function <<ref_value_kind,`value::kind`>> may be used to query the kind stored in the value. Alternatively, member functions like <<ref_value_is_object,`value::is_object`>> <<ref_value_is_number,`value::is_number`>> may be used to check whether or not the value is a particular kind:
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