[gmpi] Re: Linux C++ question
- From: "B.J. Buchalter" <bj@xxxxxxxxxx>
- To: "gmpi@xxxxxxxxxxxxx" <gmpi@xxxxxxxxxxxxx>
- Date: Wed, 23 Feb 2005 17:05:31 -0500
on 2/23/05 4:47 PM, Jeff McClintock at jeffmcc@xxxxxxxxxx wrote:
>> Also, could plugin_list be a map instead? That would avoid having to
>> iterate to lookup.
>
> Hmm, don't work quite as expected. Map contains pointers to GUIDs. Two
> GUID's may contain the same value, but the lookup fails because the map
> is testing equality of the pointers.
You need to define a comparison operator for the GUID pointer type, and then
pass define the set template with the operator:
typedef GMPI_GUID* GMPI_GUIDPtr;
struct GUIDPtr_Comp : std::binary_function<GMPI_GUIDPtr, GMPI_GUIDPtr, bool>
{
bool operator()(const GMPI_GUIDPtr& x, const GMPI_GUIDPtr& y) const
{return static_cast<bool>(
// code here compares the values pointed to by x and y,
// returning true when x < y
);
}
};
typedef std::map<GMPI_GUID*, PLUGIN_CREATE_FUNCTION, GUIDPtr_Comp>
GMPI_creator_list_type;
and use GMPI_creator_list_type in place of the plug-in list in the original
code.
This code may not actually compile, but it is extracted from code that
actually compiles and does the task that has been described...
Best regards,
B.J. Buchalter
Metric Halo
5 Donovan Drive
Hopewell Junction, NY 12533 USA
tel +1 845 223-6112
fax +1 603 250-2451
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