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Move part counter to the namespace scope

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to reduce the number of instantiations
This commit is contained in:
Victor Zverovich 2019-08-25 08:19:49 -07:00
parent 1a7d172dc7
commit fe00cddde2
1 changed files with 40 additions and 45 deletions
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85
include/fmt/compile.h
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@ -260,57 +260,52 @@ class prepared_format {
PreparedPartsProvider parts_provider_;
};
template <typename Char> struct part_counter {
public:
FMT_CONSTEXPR part_counter() : counter_(0u) {}
FMT_CONSTEXPR void on_text(const Char* begin, const Char* end) {
if (begin != end) ++counter_;
}
FMT_CONSTEXPR void on_arg_id() { ++counter_; }
FMT_CONSTEXPR void on_arg_id(unsigned) { ++counter_; }
FMT_CONSTEXPR void on_arg_id(basic_string_view<Char>) { ++counter_; }
FMT_CONSTEXPR void on_replacement_field(const Char*) {}
FMT_CONSTEXPR const Char* on_format_specs(const Char* begin,
const Char* end) {
// Find the matching brace.
unsigned braces_counter = 0;
for (; begin != end; ++begin) {
if (*begin == '{') {
++braces_counter;
} else if (*begin == '}') {
if (braces_counter == 0u) break;
--braces_counter;
}
}
return begin;
}
FMT_CONSTEXPR void on_error(const char*) {}
FMT_CONSTEXPR unsigned result() const { return counter_; }
private:
unsigned counter_;
};
template <typename Format> class compiletime_prepared_parts_type_provider {
private:
using char_type = char_t<Format>;
class count_handler {
public:
FMT_CONSTEXPR count_handler() : counter_(0u) {}
FMT_CONSTEXPR void on_text(const char_type* begin, const char_type* end) {
if (begin != end) ++counter_;
}
FMT_CONSTEXPR void on_arg_id() { ++counter_; }
FMT_CONSTEXPR void on_arg_id(unsigned) { ++counter_; }
FMT_CONSTEXPR void on_arg_id(basic_string_view<char_type>) { ++counter_; }
FMT_CONSTEXPR void on_replacement_field(const char_type*) {}
FMT_CONSTEXPR const char_type* on_format_specs(const char_type* begin,
const char_type* end) {
return find_matching_brace(begin, end);
}
FMT_CONSTEXPR void on_error(const char*) {}
FMT_CONSTEXPR unsigned result() const { return counter_; }
private:
FMT_CONSTEXPR const char_type* find_matching_brace(const char_type* begin,
const char_type* end) {
unsigned braces_counter{0u};
for (; begin != end; ++begin) {
if (*begin == '{') {
++braces_counter;
} else if (*begin == '}') {
if (braces_counter == 0u) break;
--braces_counter;
}
}
return begin;
}
private:
unsigned counter_;
};
static FMT_CONSTEXPR unsigned count_parts() {
FMT_CONSTEXPR_DECL const auto text = to_string_view(Format{});
count_handler handler;
internal::parse_format_string</*IS_CONSTEXPR=*/true>(text, handler);
return handler.result();
part_counter<char_type> counter;
internal::parse_format_string</*IS_CONSTEXPR=*/true>(text, counter);
return counter.result();
}
// Workaround for old compilers. Compiletime parts preparation will not be