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ircd::json: Add 'defaults' construct to iov.

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This commit is contained in:
Jason Volk 2017-10-25 09:29:34 -07:00
parent bc3e4e3fce
commit 6562efb11e
2 changed files with 50 additions and 0 deletions
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18
include/ircd/json/iov.h
View file

@ -54,6 +54,8 @@ struct ircd::json::iov
struct add_if;
struct set;
struct set_if;
struct defaults;
struct defaults_if;
public:
bool has(const string_view &key) const;
@ -103,3 +105,19 @@ struct ircd::json::iov::set_if
set_if(iov &, const bool &, member);
set_if() = default;
};
/// Add member to the object vector if doesn't exist; otherwise ignored
struct ircd::json::iov::defaults
:protected ircd::json::iov::node
{
defaults(iov &, member);
defaults() = default;
};
/// iov::defaults only if the bool argument is true for your condition
struct ircd::json::iov::defaults_if
:protected ircd::json::iov::node
{
defaults_if(iov &, const bool &, member);
defaults_if() = default;
};

32
ircd/json.cc
View file

@ -434,6 +434,38 @@ ircd::json::iov::set_if::set_if(iov &iov,
iov.pop_front();
}
ircd::json::iov::defaults::defaults(iov &iov,
member member)
:node
{
iov, std::move(member)
}
{
const auto count
{
std::count_if(std::begin(iov), std::end(iov), [&member]
(const auto &existing)
{
return string_view{existing.first} == string_view{member.first};
})
};
if(count > 1)
iov.pop_front();
}
ircd::json::iov::defaults_if::defaults_if(iov &iov,
const bool &b,
member member)
:node
{
iov, std::move(member)
}
{
if(!b)
iov.pop_front();
}
///////////////////////////////////////////////////////////////////////////////
//
// json/member.h