lexical analysis More...

#include <json.hpp>

Inheritance diagram for nlohmann::detail::lexer< BasicJsonType, InputAdapterType >:

Collaboration diagram for nlohmann::detail::lexer< BasicJsonType, InputAdapterType >:

Public Types
using	token_type = typename lexer_base<BasicJsonType>::token_type
Public Types inherited from nlohmann::detail::lexer_base< BasicJsonType >
enum class	token_type { uninitialized , literal_true , literal_false , literal_null , value_string , value_unsigned , value_integer , value_float , begin_array , begin_object , end_array , end_object , name_separator , value_separator , parse_error , end_of_input , literal_or_value }
	token types for the parser More...

Public Member Functions
	lexer (InputAdapterType &&adapter, bool ignore_comments_=false) noexcept
	lexer (const lexer &)=delete
	lexer (lexer &&)=default
lexer &	operator= (lexer &)=delete
lexer &	operator= (lexer &&)=default
	~lexer ()=default
constexpr number_integer_t	get_number_integer () const noexcept
	return integer value
constexpr number_unsigned_t	get_number_unsigned () const noexcept
	return unsigned integer value
constexpr number_float_t	get_number_float () const noexcept
	return floating-point value
string_t &	get_string ()
	return current string value (implicitly resets the token; useful only once)
constexpr position_t	get_position () const noexcept
	return position of last read token
std::string	get_token_string () const
	return the last read token (for errors only).
JSON_HEDLEY_RETURNS_NON_NULL constexpr const char *	get_error_message () const noexcept
	return syntax error message
bool	skip_bom ()
	skip the UTF-8 byte order mark
void	skip_whitespace ()
token_type	scan ()

Private Types
using	number_integer_t = typename BasicJsonType::number_integer_t
using	number_unsigned_t = typename BasicJsonType::number_unsigned_t
using	number_float_t = typename BasicJsonType::number_float_t
using	string_t = typename BasicJsonType::string_t
using	char_type = typename InputAdapterType::char_type
using	char_int_type = typename std::char_traits<char_type>::int_type

Private Member Functions
int	get_codepoint ()
	get codepoint from 4 hex characters following \u
bool	next_byte_in_range (std::initializer_list< char_int_type > ranges)
	check if the next byte(s) are inside a given range
token_type	scan_string ()
	scan a string literal
bool	scan_comment ()
	scan a comment
token_type	scan_number ()
	scan a number literal
token_type	scan_literal (const char_type *literal_text, const std::size_t length, token_type return_type)
void	reset () noexcept
	reset token_buffer; current character is beginning of token
char_int_type	get ()
void	unget ()
	unget current character (read it again on next get)
void	add (char_int_type c)
	add a character to token_buffer

Static Private Member Functions
static JSON_HEDLEY_PURE char	get_decimal_point () noexcept
	return the locale-dependent decimal point
static void	strtof (float &f, const char str, char *endptr) noexcept
static void	strtof (double &f, const char str, char *endptr) noexcept
static void	strtof (long double &f, const char str, char *endptr) noexcept

Private Attributes
InputAdapterType	ia
	input adapter
const bool	ignore_comments = false
	whether comments should be ignored (true) or signaled as errors (false)
char_int_type	current = std::char_traits<char_type>::eof()
	the current character
bool	next_unget = false
	whether the next get() call should just return current
position_t	position {}
	the start position of the current token
std::vector< char_type >	token_string {}
	raw input token string (for error messages)
string_t	token_buffer {}
	buffer for variable-length tokens (numbers, strings)
const char *	error_message = ""
	a description of occurred lexer errors
number_integer_t	value_integer = 0
number_unsigned_t	value_unsigned = 0
number_float_t	value_float = 0
const char_int_type	decimal_point_char = '.'
	the decimal point

Additional Inherited Members
Static Public Member Functions inherited from nlohmann::detail::lexer_base< BasicJsonType >
JSON_HEDLEY_RETURNS_NON_NULL static JSON_HEDLEY_CONST const char *	token_type_name (const token_type t) noexcept
	return name of values of type token_type (only used for errors)

Detailed Description

template<typename BasicJsonType, typename InputAdapterType>
class nlohmann::detail::lexer< BasicJsonType, InputAdapterType >

This class organizes the lexical analysis during JSON deserialization.

Definition at line 6406 of file json.hpp.

Member Typedef Documentation

◆ char_int_type

template<typename BasicJsonType, typename InputAdapterType>

using nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::char_int_type = typename std::char_traits<char_type>::int_type

private

Definition at line 6413 of file json.hpp.

◆ char_type

template<typename BasicJsonType, typename InputAdapterType>

using nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::char_type = typename InputAdapterType::char_type

private

Definition at line 6412 of file json.hpp.

◆ number_float_t

template<typename BasicJsonType, typename InputAdapterType>

using nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::number_float_t = typename BasicJsonType::number_float_t

private

Definition at line 6410 of file json.hpp.

◆ number_integer_t

template<typename BasicJsonType, typename InputAdapterType>

using nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::number_integer_t = typename BasicJsonType::number_integer_t

private

Definition at line 6408 of file json.hpp.

◆ number_unsigned_t

template<typename BasicJsonType, typename InputAdapterType>

using nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::number_unsigned_t = typename BasicJsonType::number_unsigned_t

private

Definition at line 6409 of file json.hpp.

◆ string_t

template<typename BasicJsonType, typename InputAdapterType>

using nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::string_t = typename BasicJsonType::string_t

private

Definition at line 6411 of file json.hpp.

◆ token_type

template<typename BasicJsonType, typename InputAdapterType>

using nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::token_type = typename lexer_base<BasicJsonType>::token_type

Definition at line 6416 of file json.hpp.

Constructor & Destructor Documentation

◆ lexer() [1/3]

template<typename BasicJsonType, typename InputAdapterType>

nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::lexer	(	InputAdapterType &&	adapter,
		bool	ignore_comments_ = false )

inlineexplicitnoexcept

Definition at line 6418 of file json.hpp.

References decimal_point_char, get_decimal_point(), ia, and ignore_comments.

Referenced by lexer(), lexer(), operator=(), and operator=().

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◆ lexer() [2/3]

template<typename BasicJsonType, typename InputAdapterType>

nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::lexer ( const lexer< BasicJsonType, InputAdapterType > & )

delete

References lexer().

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◆ lexer() [3/3]

template<typename BasicJsonType, typename InputAdapterType>

nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::lexer ( lexer< BasicJsonType, InputAdapterType > && )

default

References lexer().

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◆ ~lexer()

template<typename BasicJsonType, typename InputAdapterType>

nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::~lexer ( )

default

References JSON_HEDLEY_PURE.

Member Function Documentation

◆ add()

template<typename BasicJsonType, typename InputAdapterType>

void nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::add ( char_int_type c )

inlineprivate

Definition at line 7544 of file json.hpp.

References token_buffer.

Referenced by next_byte_in_range(), scan_number(), and scan_string().

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◆ get()

template<typename BasicJsonType, typename InputAdapterType>

char_int_type nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get ( )

inlineprivate

Definition at line 7490 of file json.hpp.

References current, ia, JSON_HEDLEY_LIKELY, next_unget, position, and token_string.

Referenced by get_codepoint(), next_byte_in_range(), scan_comment(), scan_literal(), scan_number(), scan_string(), skip_bom(), and skip_whitespace().

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◆ get_codepoint()

template<typename BasicJsonType, typename InputAdapterType>

int nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_codepoint ( )

inlineprivate

For input "\u c1 c2 c3 c4" the codepoint is: (c1 * 0x1000) + (c2 * 0x0100) + (c3 * 0x0010) + c4 = (c1 << 12) + (c2 << 8) + (c3 << 4) + (c4 << 0)

Furthermore, the possible characters '0'..'9', 'A'..'F', and 'a'..'f' must be converted to the integers 0x0..0x9, 0xA..0xF, 0xA..0xF, resp. The conversion is done by subtracting the offset (0x30, 0x37, and 0x57) between the ASCII value of the character and the desired integer value.

Returns: codepoint (0x0000..0xFFFF) or -1 in case of an error (e.g. EOF or non-hex character)

Definition at line 6464 of file json.hpp.

References current, get(), and JSON_ASSERT.

Referenced by scan_string().

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◆ get_decimal_point()

template<typename BasicJsonType, typename InputAdapterType>

JSON_HEDLEY_PURE char nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_decimal_point ( )

inlinestaticprivatenoexcept

Definition at line 6438 of file json.hpp.

References JSON_ASSERT.

Referenced by lexer().

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◆ get_error_message()

template<typename BasicJsonType, typename InputAdapterType>

JSON_HEDLEY_RETURNS_NON_NULL constexpr const char * nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_error_message ( ) const

inlineconstexprnoexcept

Definition at line 7596 of file json.hpp.

References error_message.

◆ get_number_float()

template<typename BasicJsonType, typename InputAdapterType>

number_float_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_number_float ( ) const

inlineconstexprnoexcept

Definition at line 7558 of file json.hpp.

References value_float.

◆ get_number_integer()

template<typename BasicJsonType, typename InputAdapterType>

number_integer_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_number_integer ( ) const

inlineconstexprnoexcept

Definition at line 7552 of file json.hpp.

References value_integer.

◆ get_number_unsigned()

template<typename BasicJsonType, typename InputAdapterType>

number_unsigned_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_number_unsigned ( ) const

inlineconstexprnoexcept

Definition at line 7555 of file json.hpp.

References value_unsigned.

◆ get_position()

template<typename BasicJsonType, typename InputAdapterType>

position_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_position ( ) const

inlineconstexprnoexcept

Definition at line 7568 of file json.hpp.

References position.

◆ get_string()

template<typename BasicJsonType, typename InputAdapterType>

string_t & nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_string ( )

inline

Definition at line 7561 of file json.hpp.

References token_buffer.

◆ get_token_string()

template<typename BasicJsonType, typename InputAdapterType>

std::string nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::get_token_string ( ) const

inline

Will never contain EOF (an arbitrary value that is not a valid char value, often -1), because 255 may legitimately occur. May contain NUL, which should be escaped.

Definition at line 7573 of file json.hpp.

References nlohmann::result, and token_string.

◆ next_byte_in_range()

template<typename BasicJsonType, typename InputAdapterType>

bool nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::next_byte_in_range ( std::initializer_list< char_int_type > ranges )

inlineprivate

Adds the current byte and, for each passed range, reads a new byte and checks if it is inside the range. If a violation was detected, set up an error message and return false. Otherwise, return true.

Parameters

[in] ranges list of integers; interpreted as list of pairs of inclusive lower and upper bound, respectively

Precondition: The passed list ranges must have 2, 4, or 6 elements; that is, 1, 2, or 3 pairs. This precondition is enforced by an assertion.

Returns: true if and only if no range violation was detected

Definition at line 6504 of file json.hpp.

References add(), current, error_message, get(), JSON_ASSERT, and JSON_HEDLEY_LIKELY.

Referenced by scan_string().

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◆ operator=() [1/2]

template<typename BasicJsonType, typename InputAdapterType>

lexer & nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::operator= ( lexer< BasicJsonType, InputAdapterType > && )

default

References lexer().

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◆ operator=() [2/2]

template<typename BasicJsonType, typename InputAdapterType>

lexer & nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::operator= ( lexer< BasicJsonType, InputAdapterType > & )

delete

References lexer().

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◆ reset()

template<typename BasicJsonType, typename InputAdapterType>

void nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::reset ( )

inlineprivatenoexcept

Definition at line 7473 of file json.hpp.

References current, token_buffer, and token_string.

Referenced by scan_number(), and scan_string().

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◆ scan()

template<typename BasicJsonType, typename InputAdapterType>

token_type nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::scan ( )

inline

Definition at line 7626 of file json.hpp.

References current, error_message, ignore_comments, position, scan_comment(), scan_literal(), scan_number(), scan_string(), skip_bom(), and skip_whitespace().

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◆ scan_comment()

template<typename BasicJsonType, typename InputAdapterType>

bool nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::scan_comment ( )

inlineprivate

Returns: whether comment could be scanned successfully

Definition at line 7059 of file json.hpp.

References error_message, get(), and unget().

Referenced by scan().

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◆ scan_literal()

template<typename BasicJsonType, typename InputAdapterType>

token_type nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::scan_literal	(	const char_type *	literal_text,
		const std::size_t	length,
		token_type	return_type )

inlineprivate

Parameters

[in]	literal_text	the literal text to expect
[in]	length	the length of the passed literal text
[in]	return_type	the token type to return on success

Definition at line 7456 of file json.hpp.

References current, error_message, get(), i, JSON_ASSERT, JSON_HEDLEY_UNLIKELY, and scan_literal().

Referenced by scan(), and scan_literal().

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◆ scan_number()

template<typename BasicJsonType, typename InputAdapterType>

token_type nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::scan_number ( )

inlineprivate

This function scans a string according to Sect. 6 of RFC 8259.

The function is realized with a deterministic finite state machine derived from the grammar described in RFC 8259. Starting in state "init", the input is read and used to determined the next state. Only state "done" accepts the number. State "error" is a trap state to model errors. In the table below, "anything" means any character but the ones listed before.

state	0	1-9	e E	+	-	.	anything
init	zero	any1	[error]	[error]	minus	[error]	[error]
minus	zero	any1	[error]	[error]	[error]	[error]	[error]
zero	done	done	exponent	done	done	decimal1	done
any1	any1	any1	exponent	done	done	decimal1	done
decimal1	decimal2	decimal2	[error]	[error]	[error]	[error]	[error]
decimal2	decimal2	decimal2	exponent	done	done	done	done
exponent	any2	any2	[error]	sign	sign	[error]	[error]
sign	any2	any2	[error]	[error]	[error]	[error]	[error]
any2	any2	any2	done	done	done	done	done

The state machine is realized with one label per state (prefixed with "scan_number_") and goto statements between them. The state machine contains cycles, but any cycle can be left when EOF is read. Therefore, the function is guaranteed to terminate.

During scanning, the read bytes are stored in token_buffer. This string is then converted to a signed integer, an unsigned integer, or a floating-point number.

Returns: token_type::value_unsigned, token_type::value_integer, or token_type::value_float if number could be successfully scanned, token_type::parse_error otherwise

Note: The scanner is independent of the current locale. Internally, the locale's decimal point is used instead of . to work with the locale-dependent converters.

Definition at line 7163 of file json.hpp.

References add(), current, decimal_point_char, error_message, get(), JSON_ASSERT, reset(), strtof(), token_buffer, unget(), value_float, value_integer, value_unsigned, and x.

Referenced by scan().

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◆ scan_string()

template<typename BasicJsonType, typename InputAdapterType>

token_type nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::scan_string ( )

inlineprivate

This function scans a string according to Sect. 7 of RFC 8259. While scanning, bytes are escaped and copied into buffer token_buffer. Then the function returns successfully, token_buffer is not null-terminated (as it may contain \0 bytes), and token_buffer.size() is the number of bytes in the string.

Returns: token_type::value_string if string could be successfully scanned, token_type::parse_error otherwise

Note: In case of errors, variable error_message contains a textual description.

Definition at line 6537 of file json.hpp.

References add(), current, error_message, get(), get_codepoint(), JSON_ASSERT, JSON_HEDLEY_LIKELY, JSON_HEDLEY_UNLIKELY, next_byte_in_range(), and reset().

Referenced by scan().

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◆ skip_bom()

template<typename BasicJsonType, typename InputAdapterType>

bool nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::skip_bom ( )

inline

Returns: true iff there is no BOM or the correct BOM has been skipped

Definition at line 7606 of file json.hpp.

References get(), and unget().

Referenced by scan().

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◆ skip_whitespace()

template<typename BasicJsonType, typename InputAdapterType>

void nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::skip_whitespace ( )

inline

Definition at line 7619 of file json.hpp.

References current, and get().

Referenced by scan().

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◆ strtof() [1/3]

template<typename BasicJsonType, typename InputAdapterType>

void nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::strtof	(	double &	f,
		const char *	str,
		char **	endptr )

inlinestaticprivatenoexcept

Definition at line 7118 of file json.hpp.

References f, and strtof().

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◆ strtof() [2/3]

template<typename BasicJsonType, typename InputAdapterType>

void nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::strtof	(	float &	f,
		const char *	str,
		char **	endptr )

inlinestaticprivatenoexcept

Definition at line 7115 of file json.hpp.

References f, and strtof().

Referenced by scan_number(), strtof(), strtof(), and strtof().

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◆ strtof() [3/3]

template<typename BasicJsonType, typename InputAdapterType>

void nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::strtof	(	long double &	f,
		const char *	str,
		char **	endptr )

inlinestaticprivatenoexcept

Definition at line 7121 of file json.hpp.

References f, and strtof().

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◆ unget()

template<typename BasicJsonType, typename InputAdapterType>

void nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::unget ( )

inlineprivate

We implement unget by setting variable next_unget to true. The input is not changed - we just simulate ungetting by modifying chars_read_total, chars_read_current_line, and token_string. The next call to get() will behave as if the unget character is read again.

Definition at line 7522 of file json.hpp.

References current, JSON_ASSERT, JSON_HEDLEY_LIKELY, next_unget, position, and token_string.

Referenced by scan_comment(), scan_number(), and skip_bom().

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Member Data Documentation

◆ current

template<typename BasicJsonType, typename InputAdapterType>

char_int_type nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::current = std::char_traits<char_type>::eof()

private

Definition at line 7719 of file json.hpp.

Referenced by get(), get_codepoint(), next_byte_in_range(), reset(), scan(), scan_literal(), scan_number(), scan_string(), skip_whitespace(), and unget().

◆ decimal_point_char

template<typename BasicJsonType, typename InputAdapterType>

const char_int_type nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::decimal_point_char = '.'

private

Definition at line 7742 of file json.hpp.

Referenced by lexer(), and scan_number().

◆ error_message

template<typename BasicJsonType, typename InputAdapterType>

const char* nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::error_message = ""

private

Definition at line 7734 of file json.hpp.

Referenced by get_error_message(), next_byte_in_range(), scan(), scan_comment(), scan_literal(), scan_number(), and scan_string().

◆ ia

template<typename BasicJsonType, typename InputAdapterType>

InputAdapterType nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::ia

private

Definition at line 7713 of file json.hpp.

Referenced by lexer(), and get().

◆ ignore_comments

template<typename BasicJsonType, typename InputAdapterType>

const bool nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::ignore_comments = false

private

Definition at line 7716 of file json.hpp.

Referenced by lexer(), and scan().

◆ next_unget

template<typename BasicJsonType, typename InputAdapterType>

bool nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::next_unget = false

private

Definition at line 7722 of file json.hpp.

Referenced by get(), and unget().

◆ position

template<typename BasicJsonType, typename InputAdapterType>

position_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::position {}

private

Definition at line 7725 of file json.hpp.

Referenced by get(), get_position(), scan(), and unget().

◆ token_buffer

template<typename BasicJsonType, typename InputAdapterType>

string_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::token_buffer {}

private

Definition at line 7731 of file json.hpp.

Referenced by add(), get_string(), reset(), and scan_number().

◆ token_string

template<typename BasicJsonType, typename InputAdapterType>

std::vector<char_type> nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::token_string {}

private

Definition at line 7728 of file json.hpp.

Referenced by get(), get_token_string(), reset(), and unget().

◆ value_float

template<typename BasicJsonType, typename InputAdapterType>

number_float_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::value_float = 0

private

Definition at line 7739 of file json.hpp.

Referenced by get_number_float(), and scan_number().

◆ value_integer

template<typename BasicJsonType, typename InputAdapterType>

number_integer_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::value_integer = 0

private

Definition at line 7737 of file json.hpp.

Referenced by get_number_integer(), and scan_number().

◆ value_unsigned

template<typename BasicJsonType, typename InputAdapterType>

number_unsigned_t nlohmann::detail::lexer< BasicJsonType, InputAdapterType >::value_unsigned = 0

private

Definition at line 7738 of file json.hpp.

Referenced by get_number_unsigned(), and scan_number().

The documentation for this class was generated from the following file:

install/include/nlohmann/json.hpp

Public Types

Public Member Functions

Private Types

Private Member Functions

Static Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ char_int_type

◆ char_type

◆ number_float_t

◆ number_integer_t

◆ number_unsigned_t

◆ string_t

◆ token_type

Constructor & Destructor Documentation

◆ lexer() [1/3]

◆ lexer() [2/3]

◆ lexer() [3/3]

◆ ~lexer()

Member Function Documentation

◆ add()

◆ get()

◆ get_codepoint()

◆ get_decimal_point()

◆ get_error_message()

◆ get_number_float()

◆ get_number_integer()

◆ get_number_unsigned()

◆ get_position()

◆ get_string()

◆ get_token_string()

◆ next_byte_in_range()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ reset()

◆ scan()

◆ scan_comment()

◆ scan_literal()

◆ scan_number()

◆ scan_string()

◆ skip_bom()

◆ skip_whitespace()

◆ strtof() [1/3]

◆ strtof() [2/3]

◆ strtof() [3/3]

◆ unget()

Member Data Documentation

◆ current

◆ decimal_point_char

◆ error_message

◆ ia

◆ ignore_comments

◆ next_unget

◆ position

◆ token_buffer

◆ token_string

◆ value_float

◆ value_integer

◆ value_unsigned