Pras Velagapudi ff9a466152 Add an into() operator on Node to do optional assignment. ... This adds an `into()` operator to the Node class modeled off the `get_to()` operator in the popular nlohmann::json library. (See: https://github.com/nlohmann/json#basic-usage) This operator assigns a casted value to an existing variable if that node has a defined value, and otherwise leaves the variable unchanged. It returns `true` if the variable was overwritten and `false` if the variable was unchanged. This operator is extremely useful in applications where YAML is being used as a configuration source that overrides default values coming from another source, e.g.: ```c++ struct MyConfig { int foo = 4; double bar = 5.0; std::string baz = "six"; }; MyConfig config; node["foo"].into(config.foo); node["bar"].into(config.bar); if (!node["baz"].into(config.baz)) std::cerr << "Using default value for .baz!" << std::endl; ```		2021-11-25 09:30:53 -05:00
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node_test.cpp	Add an into() operator on Node to do optional assignment.	2021-11-25 09:30:53 -05:00