[core, node] Implement bindings for addLayer

1 files changed, 5 insertions, 0 deletions

diff --git a/include/mbgl/style/conversion.hpp b/include/mbgl/style/conversion.hpp
index eff7e293a3..2cb3ced376 100644
--- a/include/mbgl/style/conversion.hpp
+++ b/include/mbgl/style/conversion.hpp
@@ -28,6 +28,8 @@ namespace conversion {
    The implementation of `convert` requires that the following are legal expressions for a value `v`
    of type `const V&`:
 
+      * `isUndefined(v)` -- returns a boolean indication whether `v` is undefined or a JSON null
+
       * `isArray(v)` -- returns a boolean indicating whether `v` represents a JSON array
       * `arrayLength(v)` -- called only if `isArray(v)`; returns a size_t length
       * `arrayMember(v)` -- called only if `isArray(v)`; returns `V` or `V&`
@@ -36,6 +38,9 @@ namespace conversion {
       * `objectMember(v, name)` -- called only if `isObject(v)`; `name` is `const char *`; return value:
          * is true when evaluated in a boolean context iff the named member exists
          * is convertable to a `V` or `V&` when dereferenced
+      * `eachMember(v, [] (const std::string&, const V&) -> optional<Error> {...})` -- called
+         only if `isObject(v)`; calls the provided lambda once for each key and value of the object;
+         short-circuits if any call returns an `Error`
 
       * `toBool(v)` -- returns `optional<bool>`, absence indicating `v` is not a JSON boolean
       * `toNumber(v)` -- returns `optional<float>`, absence indicating `v` is not a JSON number