funcs.h

c++经典教材 Blitz++ v0.8

        t2.prettyPrint(str, format);                           \
        str += ")";                                            \
    }                                                          \
};                                                             \
                                                               \
template<typename T>                                           \
struct name< complex<T>, T > {                                 \
    typedef complex<T> T_numtype1;                             \
    typedef T T_numtype2;                                      \
    typedef complex<T> T_numtype;                              \
                                                               \
    static inline T_numtype                                    \
    apply(T_numtype1 a, T_numtype2 b)                          \
    { return fun(a,b); }                                       \
							       \
    template<typename T1, typename T2>                         \
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,  \
        prettyPrintFormat& format, const T1& t1,               \
        const T2& t2)                                          \
    {                                                          \
        str += #fun;                                           \
        str += "(";                                            \
        t1.prettyPrint(str, format);                           \
        str += ",";                                            \
        t2.prettyPrint(str, format);                           \
        str += ")";                                            \
    }                                                          \
};                                                             \
                                                               \
template<typename T>                                           \
struct name< T, complex<T> > {                                 \
    typedef T T_numtype1;                                      \
    typedef complex<T> T_numtype2;                             \
    typedef complex<T> T_numtype;                              \
                                                               \
    static inline T_numtype                                    \
    apply(T_numtype1 a, T_numtype2 b)                          \
    { return fun(a,b); }                                       \
							       \
    template<typename T1, typename T2>                         \
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,  \
        prettyPrintFormat& format, const T1& t1,               \
        const T2& t2)                                          \
    {                                                          \
        str += #fun;                                           \
        str += "(";                                            \
        t1.prettyPrint(str, format);                           \
        str += ",";                                            \
        t2.prettyPrint(str, format);                           \
        str += ")";                                            \
    }                                                          \
};

#ifdef BZ_HAVE_COMPLEX_MATH1
BZ_DEFINE_BINARY_CFUNC(Fn_pow,BZ_CMATHFN_SCOPE(pow))
#endif

/* Binary functions that apply only to T and return complex<T> */
    
#define BZ_DEFINE_BINARY_CFUNC2(name,fun)                         \
template<typename T_numtype1, typename T_numtype2>                \
struct name;                                                      \
                                                                  \
template<typename T>                                              \
struct name<T, T> {                                               \
    typedef T T_numtype1;                                         \
    typedef T T_numtype2;                                         \
    typedef complex<T> T_numtype;                                 \
                                                                  \
    static inline T_numtype                                       \
    apply(T_numtype1 a, T_numtype2 b)                             \
    { return fun(a,b); }                                          \
							          \
    template<typename T1, typename T2>                            \
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,     \
        prettyPrintFormat& format, const T1& t1,                  \
        const T2& t2)                                             \
    {                                                             \
        str += #fun;                                              \
        str += "(";                                               \
        t1.prettyPrint(str, format);                              \
        str += ",";                                               \
        t2.prettyPrint(str, format);                              \
        str += ")";                                               \
    }                                                             \
};

#ifdef BZ_HAVE_COMPLEX_FCNS
BZ_DEFINE_BINARY_CFUNC2(Fn_polar,BZ_CMATHFN_SCOPE(polar))
#endif
    
#endif // BZ_HAVE_COMPLEX
    
/* Binary functions that return a specified type */
    
#define BZ_DEFINE_BINARY_FUNC_RET(name,fun,ret)                   \
template<typename T_numtype1, typename T_numtype2>                \
struct name {                                                     \
    typedef ret T_numtype;                                        \
                                                                  \
    static inline T_numtype                                       \
    apply(T_numtype1 a, T_numtype2 b)                             \
    { return fun(a,b); }                                          \
							          \
    template<typename T1, typename T2>                            \
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,     \
        prettyPrintFormat& format, const T1& t1,                  \
        const T2& t2)                                             \
    {                                                             \
        str += #fun;                                              \
        str += "(";                                               \
        t1.prettyPrint(str, format);                              \
        str += ",";                                               \
        t2.prettyPrint(str, format);                              \
        str += ")";                                               \
    }                                                             \
};

#ifdef BZ_HAVE_SYSTEM_V_MATH
BZ_DEFINE_BINARY_FUNC_RET(Fn_unordered,BZ_IEEEMATHFN_SCOPE(unordered),int)
#endif
    
    
/* These functions don't quite fit the usual patterns */
    
// abs()    Absolute value
template<typename T_numtype1>
struct Fn_abs;

// abs(int)
template<>
struct Fn_abs< int > {
    typedef int T_numtype1;
    typedef int T_numtype;
    
    static inline T_numtype
    apply(T_numtype1 a)
    { return BZ_MATHFN_SCOPE(abs)(a); }
    
    template<typename T1>
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,
        prettyPrintFormat& format, const T1& t1)
    {
        str += "abs";
        str += "(";
        t1.prettyPrint(str, format);
        str += ")";
    }
};

// abs(long)
template<>
struct Fn_abs< long int > {
    typedef long int T_numtype1;
    typedef long int T_numtype;
    
    static inline T_numtype
    apply(T_numtype1 a)
    { return BZ_MATHFN_SCOPE(labs)(a); }
    
    template<typename T1>
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,
        prettyPrintFormat& format, const T1& t1)
    {
        str += "abs";
        str += "(";
        t1.prettyPrint(str, format);
        str += ")";
    }
};

// abs(float)
template<>
struct Fn_abs< float > {
    typedef float T_numtype1;
    typedef float T_numtype;
    
    static inline T_numtype
    apply(T_numtype1 a)
    { return BZ_MATHFN_SCOPE(fabs)(a); }
    
    template<typename T1>
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,
        prettyPrintFormat& format, const T1& t1)
    {
        str += "abs";
        str += "(";
        t1.prettyPrint(str, format);
        str += ")";
    }
};

// abs(double)
template<>
struct Fn_abs< double > {
    typedef double T_numtype1;
    typedef double T_numtype;
    
    static inline T_numtype
    apply(T_numtype1 a)
    { return BZ_MATHFN_SCOPE(fabs)(a); }
    
    template<typename T1>
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,
        prettyPrintFormat& format, const T1& t1)
    {
        str += "abs";
        str += "(";
        t1.prettyPrint(str, format);
        str += ")";
    }
};

// abs(long double)
template<>
struct Fn_abs< long double > {
    typedef long double T_numtype1;
    typedef long double T_numtype;
    
    static inline T_numtype
    apply(T_numtype1 a)
    { return BZ_MATHFN_SCOPE(fabs)(a); }
    
    template<typename T1>
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,
        prettyPrintFormat& format, const T1& t1)
    {
        str += "abs";
        str += "(";
        t1.prettyPrint(str, format);
        str += ")";
    }
};

#ifdef BZ_HAVE_COMPLEX_FCNS
// abs(complex<T>)
template<typename T>
struct Fn_abs< complex<T> > {
    typedef complex<T> T_numtype1;
    typedef T T_numtype;
    
    static inline T_numtype
    apply(T_numtype1 a)
    { return BZ_CMATHFN_SCOPE(abs)(a); }
    
    template<typename T1>
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,
        prettyPrintFormat& format, const T1& t1)
    {
        str += "abs";
        str += "(";
        t1.prettyPrint(str, format);
        str += ")";
    }
};
#endif // BZ_HAVE_COMPLEX_FCNS


#ifdef BZ_HAVE_IEEE_MATH
// isnan()    Nonzero if NaNS or NaNQ
template<typename T_numtype1>
struct Fn_isnan {
    typedef int T_numtype;
    
    static inline T_numtype
    apply(T_numtype1 a)
    {
#ifdef isnan
        // Some platforms define isnan as a macro, which causes the
        // BZ_IEEEMATHFN_SCOPE macro to break.
        return isnan(a); 
#else
        return BZ_IEEEMATHFN_SCOPE(isnan)(a);
#endif
    }
    
    template<typename T1>
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,
        prettyPrintFormat& format, const T1& t1)
    {
        str += "isnan";
        str += "(";
        t1.prettyPrint(str, format);
        str += ")";
    }
};
#endif // BZ_HAVE_IEEE_MATH


// Blitz cast() function
template<typename T_numtype1, typename T_cast>
struct Cast {
    typedef T_cast T_numtype;
    
    static inline T_numtype
    apply(T_numtype1 a)
    { return T_numtype(a); }

    template<typename T1>
    static inline void prettyPrint(BZ_STD_SCOPE(string) &str,
        prettyPrintFormat& format, const T1& t1)
    {
        str += BZ_DEBUG_TEMPLATE_AS_STRING_LITERAL(T_cast);
        str += "(";
        t1.prettyPrint(str, format);
        str += ")";
    }
};


BZ_NAMESPACE_END

#endif // BZ_FUNCS_H