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check_positive.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_ERR_CHECK_POSITIVE_HPP
2 #define STAN_MATH_PRIM_SCAL_ERR_CHECK_POSITIVE_HPP
3
4 #include <stan/math/prim/scal/err/domain_error.hpp>
5 #include <stan/math/prim/scal/err/domain_error_vec.hpp>
6 #include <stan/math/prim/scal/meta/value_type.hpp>
7 #include <stan/math/prim/scal/meta/length.hpp>
8 #include <stan/math/prim/scal/meta/get.hpp>
9 #include <stan/math/prim/scal/meta/is_vector_like.hpp>
10 #include <boost/type_traits/is_unsigned.hpp>
11
12 namespace stan {
13 namespace math {
14
15 namespace {
16
17 template <typename T_y, bool is_vec>
18 struct positive {
19 static bool check(const char* function,
20 const char* name,
21 const T_y& y) {
22 // have to use not is_unsigned. is_signed will be false
23 // floating point types that have no unsigned versions.
24 if (!boost::is_unsigned<T_y>::value && !(y > 0))
25 domain_error(function, name, y,
26 "is ", ", but must be > 0!");
27 return true;
28 }
29 };
30
31 template <typename T_y>
32 struct positive<T_y, true> {
33 static bool check(const char* function,
34 const char* name,
35 const T_y& y) {
36 using stan::length;
37 for (size_t n = 0; n < length(y); n++) {
38 if (!boost::is_unsigned<typename value_type<T_y>::type>::value
39 && !(stan::get(y, n) > 0))
40 domain_error_vec(function, name, y, n,
41 "is ", ", but must be > 0!");
42 }
43 return true;
44 }
45 };
46
47 }
48
65 template <typename T_y>
66 inline bool check_positive(const char* function,
67 const char* name,
68 const T_y& y) {
69 return positive<T_y, is_vector_like<T_y>::value>
70 ::check(function, name, y);
71 }
72
73 }
74 }
75 #endif
stan
Definition: log_sum_exp.hpp:8
stan::length
size_t length(const std::vector< T > &x)
Definition: length.hpp:10
domain_error_vec.hpp
is_vector_like.hpp
get.hpp
stan::math::check_positive
bool check_positive(const char *function, const char *name, const T_y &y)
Return true if y is positive.
Definition: check_positive.hpp:66
stan::math::domain_error_vec
void domain_error_vec(const char *function, const char *name, const T &y, const size_t i, const char *msg1, const char *msg2)
Throw a domain error with a consistently formatted message.
Definition: domain_error_vec.hpp:37
stan::get
T get(const std::vector< T > &x, size_t n)
Definition: get.hpp:10
stan::math::domain_error
void domain_error(const char *function, const char *name, const T &y, const char *msg1, const char *msg2)
Throw a domain error with a consistently formatted message.
Definition: domain_error.hpp:30
length.hpp
value_type.hpp
domain_error.hpp

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