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Added template class ResourceManager and friends

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git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@3714 212acab6-be3b-0410-9dea-997c60f758d6
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oripel 2004-10-11 21:25:30 +00:00
parent a9fdc1423e
commit b23141bbaf
1 changed files with 36 additions and 0 deletions
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36
Source/util.h
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@ -79,9 +79,45 @@ int my_glob(const char *pattern, int flags,
#define OPEN(a, b) open(a, b)
#endif
// round a value up to be a multiple of 512
// assumption: T is an int type
template <class T>
inline T align_to_512(const T x) {
return (x+511) & ~511;
}
// When a ResourceManager instance goes out of scope, it will run
// _FREE_RESOURCE on the resource.
// Example use:
// int fd = open(..);
// assert(fd != -1);
// ResourceManager<int, close> fdManager(fd);
template <typename _RESOURCE, typename _FREE_RESOURCE>
class ResourceManager {
public:
ResourceManager(_RESOURCE& resource) : m_resource(resource) {}
~ResourceManager() { m_free_resource(m_resource); };
private: // members
_RESOURCE& m_resource;
_FREE_RESOURCE m_free_resource;
private: // don't copy instances
ResourceManager(const ResourceManager&);
void operator=(const ResourceManager&);
};
#define DEFINE_FREEFUNC(freefunc) \
struct __free_with_##freefunc { \
template <typename T> void operator()(T& x) { freefunc(x); } \
}
DEFINE_FREEFUNC(close);
DEFINE_FREEFUNC(CloseHandle);
DEFINE_FREEFUNC(fclose);
DEFINE_FREEFUNC(free);
// TODO: (orip)
// Can the ResourceManager be made generic? Specifically use the same class to:
// (a) close(fd) on POSIX
// (b) CloseHandle(handle) on WIN32
#endif //_UTIL_H_