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value_from

Convert an object of type T to value.

Synopsis

Defined in header <boost/json/value_from.hpp>

template<
    class T>
value
value_from(
    T&& t,
    storage_ptr sp = {});
Description

This function attempts to convert an object of type T to value using

In all cases, the conversion is done by calling an overload of tag_invoke found by argument-dependent lookup. Its signature should be similar to:

void tag_invoke( value_from_tag, value&, T );

A value constructed with the storage_ptr passed to value_from is passed as the second argument to ensure that the memory resource is correctly propagated.

Exception Safety

Strong guarantee.

Template Parameters

Type

Description

T

The type of the object to convert.

Return Value

t converted to value.

Parameters

Name

Description

t

The object to convert.

sp

A storage pointer referring to the memory resource to use for the returned value. The default argument for this parameter is {}.

See Also

value_from_tag, value_to, tag_invoke: A general pattern for supporting customisable functions

Convenience header <boost/json.hpp>


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