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ircd::json: Add templates to dedup boilerplates for building IOV's.

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This commit is contained in:
Jason Volk 2018-01-24 08:07:36 -08:00
parent 429e5e1dcf
commit ddc70b014c
1 changed files with 36 additions and 0 deletions
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36
include/ircd/json/iov.h
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@ -25,6 +25,9 @@
namespace ircd::json
{
struct iov;
template<class node, size_t SIZE, class T> iov make_iov(node (&)[SIZE], T&& t);
template<class node, class T> iov make_iov(node *const &, const size_t &, T&& t);
}
/// A forward list to compose JSON efficiently on the stack.
@ -126,3 +129,36 @@ struct ircd::json::iov::defaults_if
defaults_if(iov &, const bool &, member);
defaults_if() = default;
};
/// Conversion/Generator template. This reduces boilerplate when converting
/// some iterable collection of members to an iov. You have to pre-place the
/// nodes for the iov ahead of this function and they will be filled in.
template<class node,
size_t size,
class T>
ircd::json::iov
ircd::json::make_iov(node (&nodes)[size],
T&& members)
{
return make_iov(nodes, size, std::forward<T>(members));
}
/// Conversion/Generator template. This reduces boilerplate when converting
/// some iterable collection of members to an iov. You have to pre-place the
/// nodes for the iov ahead of this function. This overload takes a dynamic
/// sized array, you have to pass the size.
template<class node,
class T>
ircd::json::iov
ircd::json::make_iov(node *const nodes,
const size_t &size,
T&& members)
{
iov ret;
size_t i{0};
for(auto&& member : members)
if(likely(i < size))
new (nodes + i++) node(ret, std::move(member));
return ret;
}