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## [0.23.0] 2020-07-26 ### Added - `p` operator to print the top of the stack via debug function - `&var` syntax to create variable reference in expression - `=` operator for variable assignment in expression - `exists` operator to check for variable existance (only for references) - `deref` operator to convert variable reference into a value (only for references) - Allow to use either float or double as floating type, parse numbers in expressions as specified type - Add boolean type, parse `true` and `false` in expressions - Add null type, parse `null` in expressions - Add string type, parse double-quoted `"string"` in expressions - Add integer and unsigned integer type, used in operators - Allow to configure underlying types from rpnlib\_config.h and -D... flags - Return `rpn_error` from operators, split error types into categories - Create a new stack by using `[` keyword. Move stack contents into the previous stack + size by using `]`. ### Changed - Stack structure no longer holds raw `float`, but internal `rpn_value` type - rpn\_... setter and getter methods use `rpn_value` type - Operator functions return `rpn_error` type, allowing to return both value and operator errors - Variables in expressions are no longer required to exist when using `&var` Expression will automatically create the variable, set it to `null` and push it's reference on the stack - It is possible to create 'reference' stack values - Improve precision of `e` and `pi` ### Fixed - Proper value for `e` constant - Allow to use multiple contexts simultaniously, replace `rpn_error` and `rpn_debug_callback` with the current `rpn_context` members `error` and `debug_callback` respectively