Add proj_get_units_from_database() (fixes #2004)

1 files changed, 29 insertions, 1 deletions

diff --git a/include/proj/io.hpp b/include/proj/io.hpp
index 3dcf7928..f07f78b8 100644
--- a/include/proj/io.hpp
+++ b/include/proj/io.hpp
@@ -1013,6 +1013,8 @@ class PROJ_GCC_DLL AuthorityFactory {
 
     PROJ_DLL std::string getDescriptionText(const std::string &code) const;
 
+    // non-standard
+
     /** CRS information */
     struct CRSInfo {
         /** Authority name */
@@ -1049,7 +1051,33 @@ class PROJ_GCC_DLL AuthorityFactory {
 
     PROJ_DLL std::list<CRSInfo> getCRSInfoList() const;
 
-    // non-standard
+    /** Unit information */
+    struct UnitInfo {
+        /** Authority name */
+        std::string authName;
+        /** Code */
+        std::string code;
+        /** Name */
+        std::string name;
+        /** Category: one of "linear", "linear_per_time", "angular",
+         * "angular_per_time", "scale", "scale_per_time" or "time" */
+        std::string category;
+        /** Conversion factor to the SI unit.
+         * It might be 0 in some cases to indicate no known conversion factor.
+         */
+        double convFactor;
+        /** PROJ short name (may be empty) */
+        std::string projShortName;
+        /** Whether the object is deprecated */
+        bool deprecated;
+
+        //! @cond Doxygen_Suppress
+        UnitInfo();
+        //! @endcond
+    };
+
+    PROJ_DLL std::list<UnitInfo> getUnitList() const;
+
     PROJ_DLL static AuthorityFactoryNNPtr
     create(const DatabaseContextNNPtr &context,
            const std::string &authorityName);