Skip to content

Latest commit

 

History

History
358 lines (271 loc) · 13 KB

basic_json_encoder.md

File metadata and controls

358 lines (271 loc) · 13 KB
Raw

jsoncons::basic_json_encoder

#include <jsoncons/json_encoder.hpp>

template<
    class CharT,
    class Sink>
> basic_json_encoder : public jsoncons::basic_json_visitor<CharT>

template<
    class CharT,
    class Sink>
> basic_compact_json_encoder : public jsoncons::basic_json_visitor<CharT>

basic_json_encoder and basic_compact_json_encoder are noncopyable and nonmoveable.

basic_json_encoder

Four specializations for common character types and sink types are defined for both the pretty print and compressed serializers:

Type Definition
json_stream_encoder basic_json_encoder<char,jsoncons::stream_sink>
json_string_encoder basic_json_encoder<char,jsoncons::string_sinkstd::string>
wjson_stream_encoder basic_json_encoder<wchar_t,jsoncons::stream_sink<wchar_t>>
wjson_string_encoder basic_json_encoder<wchar_t,jsoncons::string_sinkstd::wstring>
compact_json_stream_encoder (since 0.151.2) basic_compact_json_encoder<char,jsoncons::stream_sink>
compact_json_string_encoder (since 0.151.2) basic_compact_json_encoder<char,jsoncons::string_sinkstd::string>
compact_wjson_stream_encoder (since 0.151.2) basic_compact_json_encoder<wchar_t,jsoncons::stream_sink<wchar_t>>
compact_wjson_string_encoder (since 0.151.2) basic_compact_json_encoder<wchar_t,jsoncons::string_sinkstd::wstring>

Member types

Type Definition
char_type CharT
sink_type Sink
string_view_type

Constructors

explicit basic_json_encoder(Sink&& sink)

Constructs a new encoder that is associated with the destination sink.

basic_json_encoder(Sink&& sink, 
                   const basic_json_options<CharT>& options)

Constructs a new encoder that is associated with the destination sink and uses the specified json options.

Destructor

virtual ~basic_json_encoder() noexcept

Inherited from basic_json_visitor

Member functions

void flush(); (1)

bool begin_object(semantic_tag tag=semantic_tag::none,
                  const ser_context& context=ser_context()); (2)

bool begin_object(std::size_t length, 
                  semantic_tag tag=semantic_tag::none, 
                  const ser_context& context = ser_context()); (3)

bool end_object(const ser_context& context = ser_context()); (4)

bool begin_array(semantic_tag tag=semantic_tag::none,
                 const ser_context& context=ser_context()); (5)

bool begin_array(std::size_t length, 
                 semantic_tag tag=semantic_tag::none,
                 const ser_context& context=ser_context()); (6)

bool end_array(const ser_context& context=ser_context()); (7)

bool key(const string_view_type& name, 
          const ser_context& context=ser_context()); (8)

bool null_value(semantic_tag tag = semantic_tag::none,
                const ser_context& context=ser_context()); (9) 

bool bool_value(bool value, 
                semantic_tag tag = semantic_tag::none,
                const ser_context& context=ser_context()); (10) 

bool string_value(const string_view_type& value, 
                  semantic_tag tag = semantic_tag::none, 
                  const ser_context& context=ser_context()); (11) 

bool byte_string_value(const byte_string_view& source, 
                       semantic_tag tag=semantic_tag::none, 
                       const ser_context& context=ser_context()); (12) (until v0.152.0)

template <class Source>
bool byte_string_value(const Source& souce, 
                       semantic_tag tag=semantic_tag::none, 
                       const ser_context& context=ser_context()); (12) (since v0.152.0)

template <class Source>
bool byte_string_value(const Source& souce, 
                       uint64_t ext_tag, 
                       const ser_context& context=ser_context()); (13) (since v0.152.0)

bool uint64_value(uint64_t value, 
                  semantic_tag tag = semantic_tag::none, 
                  const ser_context& context=ser_context()); (14)

bool int64_value(int64_t value, 
                 semantic_tag tag = semantic_tag::none, 
                 const ser_context& context=ser_context()); (15)

bool half_value(uint16_t value, 
                semantic_tag tag = semantic_tag::none, 
                const ser_context& context=ser_context()); (16)

bool double_value(double value, 
                  semantic_tag tag = semantic_tag::none, 
                  const ser_context& context=ser_context()); (17)

bool begin_object(semantic_tag tag,
                  const ser_context& context,
                  std::error_code& ec); (18)

bool begin_object(std::size_t length, 
                  semantic_tag tag, 
                  const ser_context& context,
                  std::error_code& ec); (19)

bool end_object(const ser_context& context, 
                std::error_code& ec); (20)

bool begin_array(semantic_tag tag, 
                 const ser_context& context, 
                 std::error_code& ec); (21)

bool begin_array(std::size_t length, 
                 semantic_tag tag, 
                 const ser_context& context, 
                 std::error_code& ec); (22)

bool end_array(const ser_context& context, 
               std::error_code& ec); (23)

bool key(const string_view_type& name, 
          const ser_context& context, 
          std::error_code& ec); (24)

bool null_value(semantic_tag tag,
                const ser_context& context,
                std::error_code& ec); (25) 

bool bool_value(bool value, 
                semantic_tag tag,
                const ser_context& context,
                std::error_code& ec); (26) 

bool string_value(const string_view_type& value, 
                  semantic_tag tag, 
                  const ser_context& context,
                  std::error_code& ec); (27) 

bool byte_string_value(const byte_string_view& source, 
                       semantic_tag tag, 
                       const ser_context& context,
                       std::error_code& ec); (28) (until v0.152.0)

template <class Source>   
bool byte_string_value(const Source& source, 
                       semantic_tag tag, 
                       const ser_context& context,
                       std::error_code& ec); (28) (since v0.152.0)

template <class Source>   
bool byte_string_value(const Source& source, 
                       uint64_t ext_tag, 
                       const ser_context& context,
                       std::error_code& ec); (29) (since v0.152.0)

bool uint64_value(uint64_t value, 
                  semantic_tag tag, 
                  const ser_context& context,
                  std::error_code& ec); (30)

bool int64_value(int64_t value, 
                 semantic_tag tag, 
                 const ser_context& context,
                 std::error_code& ec); (31)

bool half_value(uint16_t value, 
                semantic_tag tag, 
                const ser_context& context,
                std::error_code& ec); (32)

bool double_value(double value, 
                  semantic_tag tag, 
                  const ser_context& context,
                  std::error_code& ec); (33)

template <class T>
bool typed_array(const span<T>& data, 
                 semantic_tag tag=semantic_tag::none,
                 const ser_context& context=ser_context()); (34)

bool typed_array(half_arg_t, const span<const uint16_t>& s,
    semantic_tag tag = semantic_tag::none,
    const ser_context& context = ser_context()); (35)

bool begin_multi_dim(const span<const size_t>& shape,
                     semantic_tag tag,
                     const ser_context& context); (36) 

bool end_multi_dim(const ser_context& context=ser_context()); (37) 

template <class T>
bool typed_array(const span<T>& data, 
                 semantic_tag tag,
                 const ser_context& context,
                 std::error_code& ec); (38)

bool typed_array(half_arg_t, const span<const uint16_t>& s,
                 semantic_tag tag,
                 const ser_context& context,
                 std::error_code& ec); (39)

bool begin_multi_dim(const span<const size_t>& shape,
                     semantic_tag tag,
                     const ser_context& context, 
                     std::error_code& ec); (40)

bool end_multi_dim(const ser_context& context,
                   std::error_code& ec); (41)

(1) Flushes whatever is buffered to the destination.

(2) Indicates the begining of an object of indefinite length. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(3) Indicates the begining of an object of known length. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(4) Indicates the end of an object. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(5) Indicates the beginning of an indefinite length array. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(6) Indicates the beginning of an array of known length. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(7) Indicates the end of an array. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(8) Writes the name part of an object name-value pair. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(9) Writes a null value. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(10) Writes a boolean value. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(11) Writes a text string value. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(12) Writes a byte string value source with a generic tag. Type Source must be a container that has member functions data() and size(), and member type value_type with size exactly 8 bits (since v0.152.0.) Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(13) Writes a byte string value source with a format specific tag, ext_tag. Type Source must be a container that has member functions data() and size(), and member type value_type with size exactly 8 bits (since v0.152.0.) Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(14) Writes a non-negative integer value. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(15) Writes a signed integer value. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(16) Writes a half precision floating point value. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(17) Writes a double precision floating point value. Returns true if the consumer wishes to receive more events, false otherwise. Throws a ser_error on parse errors.

(18)-(33) Same as (2)-(17), except sets ec and returns false on parse errors.

Examples

Feeding json events directly to a json_stream_encoder

#include <iostream>
#include <boost/numeric/ublas/matrix.hpp>
#include <jsoncons/json_encoder.hpp>

using namespace jsoncons;
using boost::numeric::ublas::matrix;

int main()
{
    matrix<double> A(2, 2);
    A(0, 0) = 1;
    A(0, 1) = 2;
    A(1, 0) = 3;
    A(1, 1) = 4;

    json_options options;
    json_stream_encoder os(std::cout, options); 
    os.begin_array();
    for (std::size_t i = 0; i < A.size1(); ++i)
    {
        os.begin_array();
        for (std::size_t j = 0; j < A.size2(); ++j)
        {
            os.double_value(A(i, j));
        }
        os.end_array();
    }
    os.end_array();

    return 0;
}

Output:

[
    [1,2],
    [3,4]
]

See also

byte_string_view