mirror of
https://github.com/JGRennison/OpenTTD-patches.git
synced 2024-11-11 13:10:45 +00:00
30 lines
801 B
C++
30 lines
801 B
C++
/* $Id$ */
|
|
|
|
/** @file cmd_helper.h Helper functions to extract data from command parameters. */
|
|
|
|
#ifndef CMD_HELPER_H
|
|
#define CMD_HELPER_H
|
|
|
|
#include "direction_type.h"
|
|
#include "road_type.h"
|
|
|
|
|
|
template<uint N> static inline void ExtractValid();
|
|
template<> inline void ExtractValid<1>() {}
|
|
|
|
|
|
template<typename T> struct ExtractBits;
|
|
template<> struct ExtractBits<Axis> { static const uint Count = 1; };
|
|
template<> struct ExtractBits<DiagDirection> { static const uint Count = 2; };
|
|
template<> struct ExtractBits<RoadBits> { static const uint Count = 4; };
|
|
|
|
|
|
template<typename T, uint N, typename U> static inline T Extract(U v)
|
|
{
|
|
// Check if there are enough bits in v
|
|
ExtractValid<N + ExtractBits<T>::Count <= sizeof(U) * 8>();
|
|
return (T)GB(v, N, ExtractBits<T>::Count);
|
|
}
|
|
|
|
#endif
|