Many of the member types have options that can change how they are parsed. The options and their setters are located in the daw::json::options namespace and are placed into Options template parameter via a setter function that encodes the options into a json_options_t.

<tt>json_number</tt>

To set number options use the daw::json::options::number_opt( Flags... ) method.

<tt>LiteralAsStringOpt</tt>

Controls the ability to parse numbers that are encoded as strings.

Values

Never - Never allow parsing this member as a string. It is a parser error if this member is encoded as a string
Maybe - Allow parsing this member as a string or number.
Always - Only allow parsing this member as a string. It is an error for this member to not be encoded as a string.

<tt>JsonRangeCheck</tt>

Values

Never - Do not attempt to check for narrowing when parsing integral types
CheckForNarrowing - Attempt to check for narrowing when parsing integral types

Default

Never

<tt>JsonNumberErrors</tt>

When outputting floating point numbers, control whether Inf/NaN values can be parsed/serialized. This requires that the LiteralAsString option be set to Maybe or Always

Values

None - Do not allow serialization/parsing of NaN/Inf
AllowNaN - Allow NaN to be expressed/parsed if number can be a string
AllowInf - Allow Inf/-Inf to be expressed/parsed if number can be a string
AllowNanInf - Allow NaN/Inf/-Inf to be expressed/parsed if number can be a string

Default

None

<tt>FPOutputFormat</tt>

Control the floating point output format

Values

Auto - Automatically choose between decimal and scientific output formats.
Scientific - Always format in terms of an exponent <whole>[.fraction]e<exponent>.
Decimal - Always format in terms of an exponent <whole>[.fraction]e<exponent>.

Default

Auto

<tt>json_bool</tt>

To set bool options use the daw::json::options::bool_opt( Flags... ) method.

<tt>LiteralAsStringOpt</tt>

Controls the ability to parse booleans that are encoded as strings.

Values

Never - Never allow parsing this member as a string. It is a parser error if this member is encoded as a string
Maybe - Allow parsing this member as a string or number.
Always - Only allow parsing this member as a string. It is an error for this member to not be encoded as a string.

Default

Never

<tt>json_string</tt>

To set string options use the daw::json::options::string_opt( Flags... ) method.

<tt>EightBitModes</tt>

Controls whether any string character has the high bit set. If restricted, the member will escape any character with the high bit set and when parsing will throw if the high bit is encountered. This allows 7bit JSON encoding.

Values

DisallowHigh - Escape any character with the high bit set and throw when encountered during parse
AllowFull - Allow the full 8bits in output without escaping

Default

AllowFull

<tt>json_string_raw</tt>

To set raw string options use the daw::json::options::string_raw_opt( Flags... ) method.

<tt>EightBitModes</tt>

Controls whether any string character has the high bit set. If restricted, the member will escape any character with the high bit set and when parsing will throw if the high bit is encountered. This allows 7bit JSON encoding.

Values

DisallowHigh - Escape any character with the high bit set and throw when encountered during parse
AllowFull - Allow the full 8bits in output without escaping

Default

AllowFull

<tt>AllowEscapeCharacter</tt>

In RAW String processing, if we know that there are no escaped double quotes \" we can stop at the first double quote. This allows faster string parsing

Values

Allow - Full string processing to skip escaped characters
NoEscapedDblQuote - There will never be a " sequence inside the string. This allows faster parsing

Default

Allow

<tt>json_custom</tt>

To set json_custom options use the daw::json::options::json_custom_opt( Flags... ) method.

<tt>JsonCustomTypes</tt>

Custom JSON types can be Strings(default), unquoted Literals, or a mix.

Values

String - Parser always expects a JSON string. Will surround serialized value with double quotes
Literal - Parser will expect a valid JSON literal number, bool, null
Any (Experimental) Parser will return any valid JSON value excluding leading whitespace. strings will be quoted. Any is suitable for constructing a json_value to allow adhoc parsing if json_raw is not suitable

Default

String