Exit Zen
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`memory_resource`, `polymorphic_allocator`
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`error_category`, `error_code`, `error_condition`, `system_error`
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707KB
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A <<ref_static_resource>> constructs from a caller-provided buffer, and satisfies all memory allocation requests from the buffer. Once the buffer is exhausted, subsequent calls to allocate throw the exception `std::bad_alloc`. The resource offers a simple invariant: dynamic heap allocations are never performed.
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To use the <<ref_stream_parser>>, declare an instance. Then call <<ref_stream_parser_write>> zero or more times with successive buffers representing the input JSON. When there are no more buffers, call <<ref_stream_parser_finish>>. The function <<ref_stream_parser_done>> returns `true` after a successful call to `write` or `finish` if parsing is complete.
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a <<ref_string>>, containing its name. Otherwise it's equal to the input value converted to its underlying type. |The result is the described enumerator, corresponding to the input <<ref_string>>.
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https://en.cppreference.com/w/cpp/types/integer[`std::uint64_t`]
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In the following example a JSON text is parsed from standard input a line at a time. Error codes are used instead. The function <<ref_stream_parser_finish>> is used to indicate the end of the input:
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1.54MB
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Type satisfying <<ref_is_path_like>>.
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The function <<ref_get_null_resource>> returns a global instance of the null resource. This resource offers a simple invariant: all calls to allocate will throw the exception `std::bad_alloc`. An instance of the null resource can be used to make parsing guarantee that allocations from the heap are never made. This is explored in more detail in a later section.
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`std::getline` use (see the warning in <<non_standard_json>> section).
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147KB
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The containers <<ref_array>>, <<ref_object>>, and <<ref_value>> all propagate the memory resource they were constructed with to child elements:
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clang: 3.5, 3.6, 3.7, 3.8, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
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After default construction, or after <<ref_stream_parser_reset>> is called with no arguments, the <<ref_value>> produced after a successful parse operation uses the default memory resource. To use a different memory resource, call `reset` with the resource to use. Here we use a <<ref_monotonic_resource>>, which is optimized for parsing but not subsequent modification:
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Here, the map is converted into an <<ref_object>>, since it matches <<ref_is_map_like>>. Each of its keys is converted into a <<ref_string>>, as `std::string` matches <<ref_is_string_like>>, and each of its values is converted into an <<ref_array>>, as `std::pair` matches <<ref_is_tuple_like>>. Finally, elements of pairs are converted into a `std::int64_t` number and a `bool`.
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gcc: 4.8, 4.9, 5, 6, 7, 8, 9, 10, 11, 12
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499KB
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:leveloffset: +1
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