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PDAE(2)               Icon Program Library                PDAE(2)



NNNNAAAAMMMMEEEE
     pdae - programmer-defined argument evaluation

DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     These procedures are taken mainly from TR 82-16, which
     describes how co-expressions can be used to model the
     built-in argument evaluation regime of Icon and also provide
     new ones. Some procedures have been corrected or improved.

SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
     AAAAllllllllppppaaaarrrr{{{{eeee1111,,,,eeee2222,,,, ...}}}}  parallel evaluation with last result used for short sequences
     CCCCaaaallllllll((((aaaa))))             utility procedure to call functions
     EEEExxxxttttrrrraaaacccctttt{{{{eeee1111,,,,eeee2222,,,, ...}}}} extract results of even-numbered arguments according to
                            odd-numbered values
     LLLLiiiiffffoooo{{{{eeee1111,,,,eeee2222,,,, ...}}}}    models standard Icon `lifo' evaluation
     PPPPaaaarrrraaaalllllllleeeellll{{{{eeee1111,,,,eeee2222,,,, ...}}}}parallel evaluation terminating on shortest sequence
     RRRReeeevvvveeeerrrrsssseeee{{{{eeee1111,,,,eeee2222,,,, ...}}}} left-to-right reversal of lifo evaluation
     RRRRoooottttaaaatttteeee{{{{eeee1111,,,,eeee2222,,,, ...}}}}  parallel evaluation with shorter sequences re-evaluated
     SSSSiiiimmmmpppplllleeee{{{{eeee1111,,,,eeee2222,,,, ...}}}}  simple evaluation with only success or failure

RRRREEEEQQQQUUUUIIIIRRRREEEEMMMMEEEENNNNTTTTSSSS
     _P_d_a_e requires the experimental extensions in Version 5.9 of
     Icon.

BBBBUUUUGGGGSSSS AAAANNNNDDDD LLLLIIIIMMMMIIIITTTTAAAATTTTIIIIOOOONNNNSSSS
     Because of the handling of the scope of local identifiers in
     co-expressions, expressions in programmer-defined argument
     evaluation regimes cannot communicate through local identif-
     iers. The results produced by programmer-defined argument
     evaluation regimes are always dereferenced. Some construc-
     tions, such as bbbbrrrreeeeaaaakkkk and rrrreeeettttuuuurrrrnnnn, cannot be used in arguments
     to programmer-defined argument evaluation regimes. See TR
     82-8 for details of these problems.

     At most 10 arguments can be used in the invocation of a
     programmer-defined argument evaluation regime. This limit
     can be increased by modifying CCCCaaaallllllll.

SSSSEEEEEEEE AAAALLLLSSSSOOOO
     pdco(2)

     Novak, Michael and Ralph E. Griswold. _P_r_o_g_r_a_m_m_e_r-_D_e_f_i_n_e_d
     _A_r_g_u_m_e_n_t _E_v_a_l_u_a_t_i_o_n _R_e_g_i_m_e_s, TR 82-16, Department of Com-
     puter Science, The University of Arizona, 1982.

     Griswold, Ralph E., Robert K. McConeghy, and William H.
     Mitchell.  _E_x_t_e_n_s_i_o_n_s _t_o _V_e_r_s_i_o_n _5 _o_f _t_h_e _I_c_o_n _P_r_o_g_r_a_m_m_i_n_g
     _L_a_n_g_u_a_g_e, TR 84-10a, Department of Computer Science, The
     University of Arizona, 1984.

AAAAUUUUTTTTHHHHOOOORRRRSSSS
     Ralph E. Griswold and Michael Novak



Version 5.9    The University of Arizona - 8/16/84              1

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