Examples

• ex-PolyInput2.C

User documentation

These are the functions for creating a RingElem from a string or an istream. Let str be a string, in be a string or istream (e.g. reading from file), and R any ring. They both return the expression read from in and evaluated in R.

• RingElem(R, str) -- RingElem constructor, same as ReadExpr(R, str)
• ReadExpr(R, in) -- keeps reading to the end of input (so it's convenient for reading from a string)
• ReadExprSemicolon(R, in) -- stops at the semicolon (convenient for reading from file or standard input)
• RingElems(R, in) -- returns a vector<RingElem> of the comma-separated list of RingElem written in file/string in
• RingElemVec(R, in) -- returns a vector<RingElem> of the comma-separated list of RingElem inside square brackets written in file/string in

Recognized operations in the string are:

+ - * / ^ ()

The expression may contain integer constants or decimals (which are read as exact rational numbers, e.g. 1.25 is read the same as (5/4)). The expression may contain symbols (any indices are placed after the symbol head inside square brackets, and separated by commas).

Maintainer documentation

Code is so nice it does not need any documentation! ;-)

Bugs, shortcomings and other ideas

Potentially ambiguous expressions such as 1/2/3 are accepted (without any warning message), and interpreted as (1/2)/3.

Main changes

2019

• October (v0.99650): added RingElems for reading a vector
  2016
• September (v0.99544): added "decimal numbers"

2014

• January (v0.99533): first release