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geant4/source/externals/g4tools/include/tools/carray
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2025-12-05 08:54:02 +01:00

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.
#ifndef tools_carray
#define tools_carray
//fixed array manips
namespace tools {
template <class T,class I>
inline T* _4s_to_3s(const T* a_4s,const I& a_w,const I& a_h) {
T* _3s = new T[a_w*a_h*3];
if(!_3s) return 0;
T* pfrom = (T*)a_4s;
T* pto = _3s;
{I _sz = a_w*a_h*4;
for(I i=0;i<_sz;i+=4) {
*(pto+0) = *(pfrom+0);
*(pto+1) = *(pfrom+1);
*(pto+2) = *(pfrom+2);
pfrom += 4;
pto += 3;
}}
return _3s;
}
}
#endif