+ //////////////////////////////////////////////////////////////////////
+
+ struct ParseError : std::runtime_error {
+ explicit ParseError(int line)
+ : std::runtime_error(to<std::string>("json parse error on line ", line))
+ {}
+
+ explicit ParseError(int line, std::string const& context,
+ std::string const& expected)
+ : std::runtime_error(to<std::string>("json parse error on line ", line,
+ !context.empty() ? to<std::string>(" near `", context, '\'')
+ : "",
+ ": ", expected))
+ {}
+
+ explicit ParseError(std::string const& msg)
+ : std::runtime_error("json parse error: " + msg)
+ {}
+ };
+