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Simplify dynamic_format_arg_store

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This commit is contained in:
Victor Zverovich 2020-03-17 07:13:46 -07:00
parent 2559983e7a
commit 3cf619de55
1 changed files with 18 additions and 27 deletions
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45
include/fmt/core.h
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@ -1211,33 +1211,32 @@ template <typename T> struct is_reference_wrapper : std::false_type {};
template <typename T>
struct is_reference_wrapper<std::reference_wrapper<T>> : std::true_type {};
class dyn_arg_storage {
class dynamic_arg_list {
// Workaround for clang's -Wweak-vtables. Unlike for regular classes, for
// templates it doesn't complain about inability to deduce single translation
// unit for placing vtable. So storage_node_base is made a fake template.
template <typename = void> struct storage_node_base {
using owning_ptr = std::unique_ptr<storage_node_base<>>;
virtual ~storage_node_base() = default;
owning_ptr next;
template <typename = void> struct node {
virtual ~node() = default;
std::unique_ptr<node<>> next;
};
template <typename T> struct storage_node : storage_node_base<> {
template <typename T> struct typed_node : node<> {
T value;
template <typename Arg>
FMT_CONSTEXPR storage_node(const Arg& arg) : value(arg) {}
FMT_CONSTEXPR typed_node(const Arg& arg) : value(arg) {}
template <typename Char>
FMT_CONSTEXPR storage_node(const basic_string_view<Char>& arg)
FMT_CONSTEXPR typed_node(const basic_string_view<Char>& arg)
: value(arg.data(), arg.size()) {}
};
storage_node_base<>::owning_ptr head_;
std::unique_ptr<node<>> head_;
public:
template <typename T, typename Arg> const T& push(const Arg& arg) {
auto next = std::move(head_);
auto node = new storage_node<T>(arg);
auto node = new typed_node<T>(arg);
head_.reset(node);
head_->next = std::move(next);
return node->value;
@ -1372,18 +1371,19 @@ class dynamic_format_arg_store
private:
using char_type = typename Context::char_type;
template <typename T> struct need_dyn_copy {
template <typename T> struct need_copy {
static constexpr internal::type mapped_type =
internal::mapped_type_constant<T, Context>::value;
using type = std::integral_constant<
bool, !(internal::is_reference_wrapper<T>::value ||
enum {
value = !(internal::is_reference_wrapper<T>::value ||
std::is_same<T, basic_string_view<char_type>>::value ||
std::is_same<T, internal::std_string_view<char_type>>::value ||
(mapped_type != internal::type::cstring_type &&
mapped_type != internal::type::string_type &&
mapped_type != internal::type::custom_type &&
mapped_type != internal::type::named_arg_type))>;
mapped_type != internal::type::named_arg_type))
};
};
template <typename T>
@ -1395,7 +1395,7 @@ class dynamic_format_arg_store
// Storage of arguments not fitting into basic_format_arg must grow
// without relocation because items in data_ refer to it.
internal::dyn_arg_storage storage_;
internal::dynamic_arg_list dynamic_args_;
friend class basic_format_args<Context>;
@ -1408,15 +1408,6 @@ class dynamic_format_arg_store
}
public:
dynamic_format_arg_store() = default;
~dynamic_format_arg_store() = default;
dynamic_format_arg_store(const dynamic_format_arg_store&) = delete;
dynamic_format_arg_store& operator=(const dynamic_format_arg_store&) = delete;
dynamic_format_arg_store(dynamic_format_arg_store&&) = default;
dynamic_format_arg_store& operator=(dynamic_format_arg_store&&) = default;
/**
\rst
Adds an argument into the dynamic store for later passing to a formating
@ -1438,8 +1429,8 @@ class dynamic_format_arg_store
static_assert(
!std::is_base_of<internal::named_arg_base<char_type>, T>::value,
"named arguments are not supported yet");
if (internal::const_check(need_dyn_copy<T>::type::value))
emplace_arg(storage_.push<stored_type<T>>(arg));
if (internal::const_check(need_copy<T>::value))
emplace_arg(dynamic_args_.push<stored_type<T>>(arg));
else
emplace_arg(arg);
}
@ -1450,7 +1441,7 @@ class dynamic_format_arg_store
*/
template <typename T> void push_back(std::reference_wrapper<T> arg) {
static_assert(
need_dyn_copy<T>::type::value,
need_copy<T>::value,
"objects of built-in types and string views are always copied");
emplace_arg(arg.get());
}