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25 :218

	English We can define a conversion from the user-defined type to a <<ref_value>> by defining an overload of `tag_invoke` in the same namespace. This maps `customer` to a JSON object: 174/10000 · 174
26 :227

	English This allows us to use the library function <<ref_value_from>> to produce a <<ref_value>> from our type: 103/10000 · 103
27 :235

	English The library knows what to do with standard containers. Here we convert an array of customers to a value: 104/10000 · 104
28 :243

	English To go from JSON to a user-defined type we use <<ref_value_to>>, which uses another overload of `tag_invoke`. This converts a JSON value to a `customer`. It throws an exception if the contents of the value do not match what is expected: 235/10000 · 235
29 :253

	English The code above defines the convenience function `extract`, which deduces the types of the struct members. This works, but requires that the struct is {req_DefaultConstructible}. An alternative is to construct the object directly, which is a little more verbose but doesn't require default construction: 302/10000 · 302
30 :263

	English Now we can construct customers from JSON: 41/10000 · 41
31 :270

	English The library's generic algorithms recognize when you are converting a <<ref_value>> to a container which resembles an array or object, so if you wanted to turn a JSON array into a vector of customers you might write: 215/10000 · 215
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