validate_unit_vector_index.hpp

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#ifndef STAN_MATH_PRIM_ERR_VALIDATE_UNIT_VECTOR_INDEX_HPP
#define STAN_MATH_PRIM_ERR_VALIDATE_UNIT_VECTOR_INDEX_HPP
 
#include <stan/math/prim/meta.hpp>
#include <sstream>
#include <stdexcept>
#include <string>
 
namespace stan {
namespace math {
 
inline void validate_unit_vector_index(const char* var_name, const char* expr,
                                       int val) {
  if (val <= 1) {
    [&]() STAN_COLD_PATH {
      std::stringstream msg;
      if (val == 1) {
        msg << "Found dimension size one in unit vector declaration."
            << " One-dimensional unit vector is discrete"
            << " but the target distribution must be continuous."
            << " variable=" << var_name
            << "; dimension size expression=" << expr;
      } else {
        msg << "Found dimension size less than one in unit vector declaration"
            << "; variable=" << var_name
            << "; dimension size expression=" << expr
            << "; expression value=" << val;
      }
      std::string msg_str(msg.str());
      throw std::invalid_argument(msg_str.c_str());
    }();
  }
}
 
}  // namespace math
}  // namespace stan
#endif