aw_scalar.hxx

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// ============================================================ //
//                                                              //
//   File      : aw_scalar.hxx                                  //
//   Purpose   : Scalar variables (similar to perl scalars)     //
//                                                              //
//   Coded by Ralf Westram (coder@reallysoft.de) in June 2011   //
//   Institute of Microbiology (Technical University Munich)    //
//   http://www.arb-home.de/                                    //
//                                                              //
// ============================================================ //

#ifndef AW_SCALAR_HXX
#define AW_SCALAR_HXX

#ifndef ARB_ASSERT_H
#include <arb_assert.h>
#endif
#ifndef ARBTOOLS_H
#include <arbtools.h>
#endif
#ifndef _GLIBCXX_CMATH
#include <cmath>
#endif
#ifndef ARBDB_BASE_H
#include <arbdb_base.h>
#endif
#ifndef ARB_STRING_H
#include <arb_string.h>
#endif
#ifndef AW_BASE_HXX
#include "aw_base.hxx"
#endif


#ifndef aw_assert
# define aw_assert(cond) arb_assert(cond)
#endif

class AW_scalar {
    union {
        char    *s;
        int32_t  i;
        float    f;
        GBDATA  *p;
    } value;

    enum { INT, FLOAT, STR, PNTR } type;
    static const int SCALAR_TYPES = 4;

    static const char * const type_name[SCALAR_TYPES];
    static const AW_VARIABLE_TYPE vtype[SCALAR_TYPES];

public:
    explicit AW_scalar(int32_t I)     : type(INT)   { value.i = I; }
    explicit AW_scalar(float F)       : type(FLOAT) { value.f = F; }
    explicit AW_scalar(const char *S) : type(STR)   { value.s = ARB_strdup(S); }
    explicit AW_scalar(GBDATA *P)     : type(PNTR)  { value.p = P; }
    explicit AW_scalar(class AW_awar *awar);

    AW_scalar(const AW_scalar& other)
        : value(other.value),
          type(other.type)
    {
        if (type == STR) value.s = ARB_strdup(value.s);
    }
    ~AW_scalar() { if (type == STR) { free(value.s); } }

    DECLARE_ASSIGNMENT_OPERATOR(AW_scalar);

    int32_t     get_int()     const { aw_assert(type == INT);   return value.i; }
    float       get_float()   const { aw_assert(type == FLOAT); return value.f; }
    const char *get_string()  const { aw_assert(type == STR);   return value.s; }
    GBDATA     *get_pointer() const { aw_assert(type == PNTR);  return value.p; }

    void set_int(int32_t I)        { aw_assert(type == INT);   value.i = I; }
    void set_float(float F)        { aw_assert(type == FLOAT); value.f = F; }
    void set_string(const char *S) { aw_assert(type == STR);   freedup(value.s, S); }
    void set_pointer(GBDATA *P)    { aw_assert(type == PNTR);  value.p = P; }

    const char *get_type_name() const { return type_name[type]; }
    AW_VARIABLE_TYPE matching_variable_type() const { return vtype[type]; }
    bool matches_variable_type(AW_VARIABLE_TYPE atype) const { return matching_variable_type() == atype; }

    GB_ERROR write_to(class AW_awar *awar) const;

    bool operator == (const AW_scalar& other) const {
        aw_assert(type == other.type); // type mismatch!
        bool equal = false;
        switch (type) {
            case INT:   equal = (value.i == other.value.i);             break;
            case FLOAT: equal = fabs(value.f-other.value.f)<0.000001;   break;
            case STR:   equal = strcmp(value.s, other.value.s) == 0;    break;
            case PNTR:  equal = (value.p == other.value.p);             break;
        }
        return equal;
    }
    bool operator != (const AW_scalar& other) const { return !(*this == other); }
};


#else
#error aw_scalar.hxx included twice
#endif // AW_SCALAR_HXX