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#ifndef INCLUDED_SDSL_FAST_CACHE
#define INCLUDED_SDSL_FAST_CACHE
#include "int_vector.hpp"
namespace sdsl
{
#define CACHE_SIZE 0x3FFULL
struct fast_cache {
typedef int_vector<>::size_type size_type;
size_type m_table[2*(CACHE_SIZE+1)];
// Constructor
fast_cache() {
for (size_type i=0; i < (CACHE_SIZE+1); ++i) {
m_table[i<<1] = (size_type)-1;
}
}
// Returns true if the request i is cached and
// x is set to the answer of request i
bool exists(size_type i, size_type& x) {
if (m_table[(i&CACHE_SIZE)<<1 ] == i) {
x = m_table[((i&CACHE_SIZE)<<1) + 1 ];
return true;
} else
return false;
}
// Writes the answer for request i to the cache
void write(size_type i, size_type x) {
m_table[(i&CACHE_SIZE)<<1 ] = i;
m_table[((i&CACHE_SIZE)<<1) + 1 ] = x;
}
};
} // end namespace sdsl
#endif
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