max.hpp

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#ifndef STAN_MATH_PRIM_FUN_MAX_HPP
#define STAN_MATH_PRIM_FUN_MAX_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/fun/constants.hpp>
#include <algorithm>
#include <vector>
 
namespace stan {
namespace math {
 
template <typename T1, typename T2, require_all_arithmetic_t<T1, T2>* = nullptr>
auto max(T1 x, T2 y) {
  return std::max(x, y);
}
 
template <typename T, require_container_t<T>* = nullptr>
inline value_type_t<T> max(const T& m) {
  if (std::is_integral<value_type_t<T>>::value) {
    check_nonzero_size("max", "int vector", m);
  } else if (m.size() == 0) {
    return NEGATIVE_INFTY;
  }
  return apply_vector_unary<T>::reduce(
      m, [](const auto& x) { return x.maxCoeff(); });
}
 
}  // namespace math
}  // namespace stan
 
#endif