log1m.hpp

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#ifndef STAN_MATH_PRIM_FUN_LOG1M_HPP
#define STAN_MATH_PRIM_FUN_LOG1M_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/is_nan.hpp>
#include <stan/math/prim/fun/log1p.hpp>
#include <stan/math/prim/functor/apply_scalar_unary.hpp>
 
namespace stan {
namespace math {
 
inline double log1m(double x) {
  if (!is_nan(x)) {
    check_less_or_equal("log1m", "x", x, 1);
  }
  return stan::math::log1p(-x);
}
 
struct log1m_fun {
  template <typename T>
  static inline auto fun(const T& x) {
    return log1m(x);
  }
};
 
template <
    typename T, require_not_var_matrix_t<T>* = nullptr,
    require_all_not_nonscalar_prim_or_rev_kernel_expression_t<T>* = nullptr>
inline auto log1m(const T& x) {
  return apply_scalar_unary<log1m_fun, T>::apply(x);
}
 
}  // namespace math
}  // namespace stan
 
#endif