Function S2CellId.toToken

Methods to encode and decode cell ids to compact text strings suitable for display or indexing. Cells at lower levels (i.e. larger cells) are encoded into fewer characters. The maximum token length is 16.


					
			string toToken() const;

Tokens preserve ordering, i.e. ToToken(x) < ToToken(y) iff x < y.

ToToken() returns a string by value for convenience; the compiler does this without intermediate copying in most cases.

These methods guarantee that FromToken(ToToken(x)) == x even when "x" is an invalid cell id. All tokens are alphanumeric strings. FromToken() returns S2CellId::None() for malformed inputs.

Authors

ericv@google.com (Eric Veach), madric@gmail.com (Vijay Nayar)

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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