Ian Bell c063a40183 Implement a wrapper of AbstractState that can be called through the shared library ...

Closes #508
Closes #497

Sample code:

```
    #include "CoolPropLib.h"

    const long buffer_length = 255;
    char message_buffer[buffer_length];
    long errcode = 0;
    const long N = 2;
    double fractions[N] = {0.5, 0.5};
    long T_param = get_param_index("T");
    long PQ = get_input_pair_index("PQ_INPUTS");

    long handle = AbstractState_factory("HEOS", "Water&Ethanol", &errcode, message_buffer, buffer_length);
    AbstractState_set_fractions(handle, fractions, N, &errcode, message_buffer, buffer_length);
    AbstractState_update(handle, PQ, 101325, 0,  &errcode, message_buffer, buffer_length);
    double Tc = AbstractState_keyed_output(handle, T_param, &errcode, message_buffer, buffer_length);
    AbstractState_free(handle, &errcode, message_buffer, buffer_length);
```

2015-03-01 15:30:31 -07:00

16 KiB

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