3 Array Expressions

• Expression evaluation: Expression evaluation order
• Index placeholders: Index placeholders
• Math functions 1: Single-argument math functions
• Math functions 2: Two-argument math functions
• User et: Declaring your own math functions on arrays
• Where expr: where statements

Array expressions in Blitz++ are implemented using the expression templates technique. Unless otherwise noted, expression evaluation will never generate temporaries or multiple loops; an expression such as

     Array<int,1> A, B, C, D;    // ...
     
     A = B + C + D;

will result in code similar to

     for (int i=A.lbound(firstDim); i <= A.ubound(firstDim); ++i)
         A[i] = B[i] + C[i] + D[i];