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#pragma once
/**
* @file
*
* Template implementations (as opposed to mere declarations).
*
* This file is an exmample of the "impl.hh" pattern. See the
* contributing guide.
*
* One only needs to include this when one is declaring a
* `BaseClass<CustomType>` setting, or as derived class of such an
* instantiation.
*/
#include "config.hh"
namespace nix {
template<> struct BaseSetting<Strings>::trait
{
static constexpr bool appendable = true;
};
template<> struct BaseSetting<StringSet>::trait
{
static constexpr bool appendable = true;
};
template<> struct BaseSetting<StringMap>::trait
{
static constexpr bool appendable = true;
};
template<> struct BaseSetting<std::set<ExperimentalFeature>>::trait
{
static constexpr bool appendable = true;
};
template<typename T>
struct BaseSetting<T>::trait
{
static constexpr bool appendable = false;
};
template<typename T>
bool BaseSetting<T>::isAppendable()
{
return trait::appendable;
}
template<> void BaseSetting<Strings>::appendOrSet(Strings && newValue, bool append);
template<> void BaseSetting<StringSet>::appendOrSet(StringSet && newValue, bool append);
template<> void BaseSetting<StringMap>::appendOrSet(StringMap && newValue, bool append);
template<> void BaseSetting<std::set<ExperimentalFeature>>::appendOrSet(std::set<ExperimentalFeature> && newValue, bool append);
template<typename T>
void BaseSetting<T>::appendOrSet(T && newValue, bool append)
{
static_assert(!trait::appendable, "using default `appendOrSet` implementation with an appendable type");
assert(!append);
value = std::move(newValue);
}
template<typename T>
void BaseSetting<T>::set(const std::string & str, bool append)
{
if (experimentalFeatureSettings.isEnabled(experimentalFeature))
appendOrSet(parse(str), append);
else {
assert(experimentalFeature);
warn("Ignoring setting '%s' because experimental feature '%s' is not enabled",
name,
showExperimentalFeature(*experimentalFeature));
}
}
}
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