JSON for Modern C++  3.0
template<template< typename U, typename V, typename...Args > class ObjectType = std::map, template< typename U, typename...Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
token_type nlohmann::basic_json::lexer::scan ( )
inlinenoexcept

This function implements a scanner for JSON. It is specified using regular expressions that try to follow RFC 7159 and ECMA-404 as close as possible. These regular expressions are then translated into a deterministic finite automaton (DFA) by the tool re2c http://re2c.org. As a result, the translated code for this function consists of a large block of code with goto jumps.

Returns
the class of the next token read from the buffer