c++反射调用，以格林威治为标准时间，计算时间差

! @brief return whether the value has a subtype @return whether the value has a subtype @complexity Constant. @exceptionsafety No-t

! @brief return whether value is a string This function returns true if and only if the JSON value is a string. @return `true` if type i

! @brief add an object to an array Appends the given element @a val to the end of the JSON value. If the function is called on a JSON nul

! @brief return the binary subtype Returns the numerical subtype of the value if it has a subtype. If it does not have a subtype, this fu

return whether the iterator can be dereferenced

! @brief public parser interface @param[in] strict whether to expect the last token to be EOF @param[in,out] result parsed JSON val

字符串格式转化为 tm 结构 2020-01-01 14:00:00 --> std::tm

rgba

设置fillstyle 并解析透明度 @param fillColor 颜色

! @brief public accept interface @param[in] strict whether to expect the last token to be EOF @return whether the input is a proper JSON

! @brief returns a const iterator to one past the last element Returns a const iterator to one past the last element. @image html range-

! @brief checks whether the container is empty. Checks if a JSON value has no elements (i.e. whether its @ref size is `0`). @return The

! @brief return whether value is a boolean This function returns true if and only if the JSON value is a boolean. @return `true` if type

! @brief replace all occurrences of a substring by another string @param[in,out] s the string to manipulate; changed so that all

reset token_buffer; current character is beginning of token

set iterator to a defined past the end

Android