/usr/include/armadillo_bits/arma_rng.hpp is in libarmadillo-dev 1:4.200.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright (C) 2013 NICTA (www.nicta.com.au)
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//! \addtogroup arma_rng
//! @{
#if defined(ARMA_USE_CXX11_RNG)
extern thread_local arma_rng_cxx11 arma_rng_cxx11_instance;
// thread_local arma_rng_cxx11 arma_rng_cxx11_instance;
#endif
class arma_rng
{
public:
#if defined(ARMA_USE_CXX11_RNG)
typedef arma_rng_cxx11::seed_type seed_type;
#else
typedef arma_rng_cxx98::seed_type seed_type;
#endif
#if defined(ARMA_USE_CXX11_RNG)
static const int rng_method = 1;
#else
static const int rng_method = 0;
#endif
inline static void set_seed(const seed_type val);
inline static void set_seed_random();
template<typename eT> struct randi;
template<typename eT> struct randu;
template<typename eT> struct randn;
};
inline
void
arma_rng::set_seed(const arma_rng::seed_type val)
{
#if defined(ARMA_USE_CXX11_RNG)
{
arma_rng_cxx11_instance.set_seed(val);
}
#else
{
arma_rng_cxx98::set_seed(val);
}
#endif
}
inline
void
arma_rng::set_seed_random()
{
seed_type seed1 = seed_type(0);
seed_type seed2 = seed_type(0);
seed_type seed3 = seed_type(0);
seed_type seed4 = seed_type(0);
seed_type seed5 = seed_type(0);
bool rd_ok = false;
#if defined(ARMA_USE_CXX11)
{
try
{
std::random_device rd;
seed1 = static_cast<seed_type>( rd() );
rd_ok = true;
}
catch(...) {}
}
#endif
if(rd_ok == false)
{
try
{
unsigned char buffer = 0;
std::ifstream f("/dev/urandom", std::ifstream::binary);
f.read((char*)(&buffer), 1);
seed2 = static_cast<seed_type>(buffer);
}
catch(...) {}
// get better-than-nothing seeds in case reading /dev/urandom failed
#if defined(ARMA_HAVE_GETTIMEOFDAY)
{
struct timeval posix_time;
gettimeofday(&posix_time, 0);
seed3 = static_cast<seed_type>(posix_time.tv_usec);
}
#endif
seed4 = static_cast<seed_type>( std::time(NULL) & 0xFFFF );
union
{
uword* a;
unsigned char b[sizeof(uword*)];
} address;
uword junk = 0;
address.a = &junk;
seed5 = seed_type(address.b[0]) + seed_type(address.b[sizeof(uword*)-1]);
}
arma_rng::set_seed( seed1 + seed2 + seed3 + seed4 + seed5 );
}
template<typename eT>
struct arma_rng::randi
{
arma_inline
operator eT ()
{
#if defined(ARMA_USE_CXX11_RNG)
{
return eT( arma_rng_cxx11_instance.randi_val() );
}
#else
{
return eT( arma_rng_cxx98::randi_val() );
}
#endif
}
inline
static
int
max_val()
{
#if defined(ARMA_USE_CXX11_RNG)
{
return arma_rng_cxx11::randi_max_val();
}
#else
{
return arma_rng_cxx98::randi_max_val();
}
#endif
}
inline
static
void
fill(eT* mem, const uword N, const int a, const int b)
{
#if defined(ARMA_USE_CXX11_RNG)
{
return arma_rng_cxx11_instance.randi_fill(mem, N, a, b);
}
#else
{
return arma_rng_cxx98::randi_fill(mem, N, a, b);
}
#endif
}
};
template<typename eT>
struct arma_rng::randu
{
arma_inline
operator eT ()
{
#if defined(ARMA_USE_CXX11_RNG)
{
return eT( arma_rng_cxx11_instance.randu_val() );
}
#else
{
return eT( arma_rng_cxx98::randu_val() );
}
#endif
}
inline
static
void
fill(eT* mem, const uword N)
{
uword i,j;
for(i=0, j=1; j < N; i+=2, j+=2)
{
const eT tmp_i = eT( arma_rng::randu<eT>() );
const eT tmp_j = eT( arma_rng::randu<eT>() );
mem[i] = tmp_i;
mem[j] = tmp_j;
}
if(i < N)
{
mem[i] = eT( arma_rng::randu<eT>() );
}
}
};
template<typename T>
struct arma_rng::randu< std::complex<T> >
{
arma_inline
operator std::complex<T> ()
{
return std::complex<T>( T( arma_rng::randu<T>() ), T( arma_rng::randu<T>() ) );
}
inline
static
void
fill(std::complex<T>* mem, const uword N)
{
for(uword i=0; i < N; ++i)
{
mem[i] = std::complex<T>( T( arma_rng::randu<T>() ), T( arma_rng::randu<T>() ) );
}
}
};
template<typename eT>
struct arma_rng::randn
{
inline
operator eT () const
{
#if defined(ARMA_USE_CXX11_RNG)
{
return eT( arma_rng_cxx11_instance.randn_val() );
}
#else
{
return eT( arma_rng_cxx98::randn_val() );
}
#endif
}
arma_inline
static
void
dual_val(eT& out1, eT& out2)
{
#if defined(ARMA_USE_CXX11_RNG)
{
arma_rng_cxx11_instance.randn_dual_val(out1, out2);
}
#else
{
arma_rng_cxx98::randn_dual_val(out1, out2);
}
#endif
}
inline
static
void
fill(eT* mem, const uword N)
{
uword i, j;
for(i=0, j=1; j < N; i+=2, j+=2)
{
arma_rng::randn<eT>::dual_val( mem[i], mem[j] );
}
if(i < N)
{
mem[i] = eT( arma_rng::randn<eT>() );
}
}
};
template<typename T>
struct arma_rng::randn< std::complex<T> >
{
inline
operator std::complex<T> () const
{
T a, b;
arma_rng::randn<T>::dual_val(a, b);
return std::complex<T>(a, b);
}
inline
static
void
fill(std::complex<T>* mem, const uword N)
{
for(uword i=0; i < N; ++i)
{
mem[i] = std::complex<T>( arma_rng::randn< std::complex<T> >() );
}
}
};
//! @}
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