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Prepare for arg_store unification

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This commit is contained in:
Victor Zverovich 2024-09-05 19:00:48 -07:00
parent 5bf577ca58
commit f288f45e46
1 changed files with 41 additions and 20 deletions
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61
include/fmt/base.h
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@ -2362,12 +2362,9 @@ template <typename Context, size_t NUM_ARGS>
using arg_t = conditional_t<NUM_ARGS <= max_packed_args, value<Context>,
basic_format_arg<Context>>;
// An array of references to arguments. It can be implicitly converted to
// `fmt::basic_format_args` for passing into type-erased formatting functions
// such as `fmt::vformat`.
template <typename Context, size_t NUM_ARGS, size_t NUM_NAMED_ARGS,
unsigned long long DESC>
struct format_arg_store {
struct named_arg_store {
// args_[0].named_args points to named_args to avoid bloating format_args.
// +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning.
static constexpr size_t ARGS_ARRAY_SIZE = 1 + (NUM_ARGS != 0 ? NUM_ARGS : +1);
@ -2376,7 +2373,7 @@ struct format_arg_store {
named_arg_info<typename Context::char_type> named_args[NUM_NAMED_ARGS];
template <typename... T>
FMT_CONSTEXPR FMT_ALWAYS_INLINE format_arg_store(T&... values)
FMT_CONSTEXPR FMT_ALWAYS_INLINE named_arg_store(T&... values)
: args{{named_args, NUM_NAMED_ARGS},
arg_mapper<typename Context::char_type>::map(values)...} {
int arg_index = 0, named_arg_index = 0;
@ -2384,24 +2381,30 @@ struct format_arg_store {
init_named_arg(named_args, arg_index, named_arg_index, values));
}
format_arg_store(format_arg_store&& rhs) {
named_arg_store(named_arg_store&& rhs) {
args[0] = {named_args, NUM_NAMED_ARGS};
for (size_t i = 1; i < ARGS_ARRAY_SIZE; ++i) args[i] = rhs.args[i];
for (size_t i = 0; i < NUM_NAMED_ARGS; ++i)
named_args[i] = rhs.named_args[i];
}
format_arg_store(const format_arg_store& rhs) = delete;
format_arg_store& operator=(const format_arg_store& rhs) = delete;
format_arg_store& operator=(format_arg_store&& rhs) = delete;
named_arg_store(const named_arg_store& rhs) = delete;
named_arg_store& operator=(const named_arg_store& rhs) = delete;
named_arg_store& operator=(named_arg_store&& rhs) = delete;
};
// A specialization of format_arg_store without named arguments.
// It is a plain struct to reduce binary size in debug mode.
template <typename Context, size_t NUM_ARGS, unsigned long long DESC>
struct format_arg_store<Context, NUM_ARGS, 0, DESC> {
// An array of references to arguments. It can be implicitly converted to
// `basic_format_args` for passing into type-erased formatting functions
// such as `vformat`. It is a plain struct to reduce binary size in debug mode.
template <typename Context, size_t NUM_ARGS, size_t NUM_NAMED_ARGS,
unsigned long long DESC>
struct format_arg_store {
// +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning.
arg_t<Context, NUM_ARGS> args[NUM_ARGS != 0 ? NUM_ARGS : +1];
using type =
conditional_t<NUM_NAMED_ARGS == 0,
arg_t<Context, NUM_ARGS>[NUM_ARGS != 0 ? NUM_ARGS : +1],
named_arg_store<Context, NUM_ARGS, NUM_NAMED_ARGS, DESC>>;
type args;
};
// TYPE can be different from type_constant<T>, e.g. for __float128.
@ -2640,19 +2643,37 @@ template <typename Context> class basic_format_args {
/// Constructs a `basic_format_args` object from `format_arg_store`.
template <size_t NUM_ARGS, size_t NUM_NAMED_ARGS, unsigned long long DESC,
FMT_ENABLE_IF(NUM_ARGS <= detail::max_packed_args)>
FMT_ENABLE_IF(NUM_ARGS <= detail::max_packed_args &&
NUM_NAMED_ARGS == 0)>
constexpr FMT_ALWAYS_INLINE basic_format_args(
const detail::format_arg_store<Context, NUM_ARGS, NUM_NAMED_ARGS, DESC>&
store)
: desc_(DESC), values_(store.args + (NUM_NAMED_ARGS != 0 ? 1 : 0)) {}
: desc_(DESC), values_(store.args) {}
template <size_t NUM_ARGS, size_t NUM_NAMED_ARGS, unsigned long long DESC,
FMT_ENABLE_IF(NUM_ARGS > detail::max_packed_args)>
FMT_ENABLE_IF(NUM_ARGS <= detail::max_packed_args &&
NUM_NAMED_ARGS != 0)>
constexpr FMT_ALWAYS_INLINE basic_format_args(
const detail::format_arg_store<Context, NUM_ARGS, NUM_NAMED_ARGS, DESC>&
store)
: desc_(DESC), values_(store.args.args + 1) {}
template <size_t NUM_ARGS, size_t NUM_NAMED_ARGS, unsigned long long DESC,
FMT_ENABLE_IF(NUM_ARGS > detail::max_packed_args &&
NUM_NAMED_ARGS == 0)>
constexpr basic_format_args(
const detail::format_arg_store<Context, NUM_ARGS, NUM_NAMED_ARGS, DESC>&
store)
: desc_(DESC), args_(store.args + (NUM_NAMED_ARGS != 0 ? 1 : 0)) {}
template <size_t NUM_ARGS, size_t NUM_NAMED_ARGS, unsigned long long DESC,
FMT_ENABLE_IF(NUM_ARGS > detail::max_packed_args &&
NUM_NAMED_ARGS != 0)>
constexpr basic_format_args(
const detail::format_arg_store<Context, NUM_ARGS, NUM_NAMED_ARGS, DESC>&
store)
: desc_(DESC), args_(store.args.args + 1) {}
/// Constructs a `basic_format_args` object from a dynamic list of arguments.
constexpr basic_format_args(const format_arg* args, int count,
bool has_named = false)
@ -2863,8 +2884,8 @@ template <typename Context = context, typename... T,
FMT_ENABLE_IF(NUM_NAMED_ARGS == 0)>
constexpr FMT_ALWAYS_INLINE auto make_format_args(T&... args)
-> detail::format_arg_store<Context, NUM_ARGS, 0, DESC> {
return {{{detail::arg_mapper<typename Context::char_type>::map(args)
FMT_CUSTOM}...}};
FMT_GCC_PRAGMA(GCC diagnostic ignored "-Wconversion")
return {{detail::arg_mapper<typename Context::char_type>::map(args)...}};
}
#ifndef FMT_DOC
@ -2876,7 +2897,7 @@ template <typename Context = context, typename... T,
FMT_ENABLE_IF(NUM_NAMED_ARGS != 0)>
constexpr auto make_format_args(T&... args)
-> detail::format_arg_store<Context, sizeof...(T), NUM_NAMED_ARGS, DESC> {
return {args...};
return {{args...}};
}
#endif