Primzahlen

Das folgende Programm ist das Original (neu abgetippt). Ich habe auch gleich die Ausgabe des Metaware Compilers mit angefügt. Es ist ist nicht mehr gültiges C++. Eine neuere Variante ist hier.

P:\HC\D386_O> type primes.cpp
// Prime number computation by Erwin Unruh
template <int i> struct D { D(void*); operator int(); };

template <int p, int i> struct is_prime {
    enum { prim = (p%i) && is_prime<(i > 2 ? p : 0), i -1> :: prim };
    };

template < int i > struct Prime_print {
    Prime_print<i-1> a;
    enum { prim = is_prime<i, i-1>::prim };
    void f() { D<i> d = prim; }
    };

struct is_prime<0,0> { enum {prim=1}; };
struct is_prime<0,1> { enum {prim=1}; };
struct Prime_print<2> { enum {prim = 1}; void f() { D<2> d = prim; } };
#ifndef LAST
#define LAST 10
#endif
main () {
    Prime_print<LAST> a;
    }

P:\HC\D386_O> hc3 i primes.cpp -DLAST=30
MetaWare High C/C++ Compiler R2.6
(c) Copyright 1987-94, MetaWare Incorporated
E "primes.cpp",L16/C63(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<2>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<3>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<5>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<7>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<11>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<13>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<17>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<19>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<23>´ ("primes.cpp",L2/C25).
-- Detected during instantiation of Prime_print<30> at "primes.cpp",L21/C5:
E "primes.cpp",L11/C25(#416):   prim
|    Type `enum{}´ can´t be converted to txpe `D<29>´ ("primes.cpp",L2/C25).

P:\HC\D386_O> exit


Erwin Unruh, 1. 1. 2002