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Made the sparse vector dot() more flexible.

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This commit is contained in:
Davis King 2012-04-30 23:29:52 -04:00
parent 5963906069
commit d73d9e929d
2 changed files with 23 additions and 6 deletions
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25
dlib/svm/sparse_vector.h
View File

@ -216,16 +216,33 @@ namespace dlib
// ------------------------------------------------------------------------------------
template <typename T>
typename T::value_type::second_type dot (
namespace impl
{
// This funny looking thing is here to let us use SFINAE to make the dot()
// function below only get selected from the overload resolution order if
// it's operating on two sparse vectors.
template <typename T, typename U>
struct dot_ret_type
{
typedef T type;
};
}
// This funny looking thing is here to let us use SFINAE to make the dot()
// function below only get selected from the overload resolution order if
// it's operating on two sparse vectors.
template <typename T, typename U>
typename dlib::sparse_vector::impl::dot_ret_type<typename T::value_type::second_type,typename U::value_type::second_type>::type
dot (
const T& a,
const T& b
const U& b
)
{
typedef typename T::value_type::second_type scalar_type;
typename T::const_iterator ai = a.begin();
typename T::const_iterator bi = b.begin();
typename U::const_iterator bi = b.begin();
scalar_type sum = 0;
while (ai != a.end() && bi != b.end())

4
dlib/svm/sparse_vector_abstract.h
View File

@ -152,10 +152,10 @@ namespace dlib
// ----------------------------------------------------------------------------------------
template <typename T>
template <typename T, typename U>
typename T::value_type::second_type dot (
const T& a,
const T& b
const U& b
);
/*!
requires