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Reduce template bloat in write_int

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Victor Zverovich 2020-05-01 07:53:50 -07:00
parent 3c114d091b
commit 7ca89bf87a
1 changed files with 30 additions and 17 deletions
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47
include/fmt/format.h
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@ -1413,6 +1413,33 @@ inline OutputIt write_padded(OutputIt out,
return write_padded(out, specs, size, size, f); return write_padded(out, specs, size, size, f);
} }
template <typename Char> struct write_int_params {
std::size_t size;
std::size_t padding;
Char fill;
};
template <typename Char>
write_int_params<Char> make_write_int_params(int num_digits, string_view prefix,
basic_format_specs<Char>& specs) {
std::size_t size = prefix.size() + to_unsigned(num_digits);
Char fill = specs.fill[0];
std::size_t padding = 0;
if (specs.align == align::numeric) {
auto width = to_unsigned(specs.width);
if (width > size) {
padding = width - size;
size = width;
}
} else if (specs.precision > num_digits) {
size = prefix.size() + to_unsigned(specs.precision);
padding = to_unsigned(specs.precision - num_digits);
fill = static_cast<Char>('0');
}
if (specs.align == align::none) specs.align = align::right;
return {size, padding, fill};
}
// This template provides operations for formatting and writing data into a // This template provides operations for formatting and writing data into a
// character range. // character range.
template <typename Range> class basic_writer { template <typename Range> class basic_writer {
@ -1436,25 +1463,11 @@ template <typename Range> class basic_writer {
// where <digits> are written by f(it). // where <digits> are written by f(it).
template <typename F> template <typename F>
void write_int(int num_digits, string_view prefix, format_specs specs, F f) { void write_int(int num_digits, string_view prefix, format_specs specs, F f) {
std::size_t size = prefix.size() + to_unsigned(num_digits); auto params = make_write_int_params(num_digits, prefix, specs);
char_type fill = specs.fill[0]; out_ = write_padded(out_, specs, params.size, [=](reserve_iterator it) {
std::size_t padding = 0;
if (specs.align == align::numeric) {
auto unsiged_width = to_unsigned(specs.width);
if (unsiged_width > size) {
padding = unsiged_width - size;
size = unsiged_width;
}
} else if (specs.precision > num_digits) {
size = prefix.size() + to_unsigned(specs.precision);
padding = to_unsigned(specs.precision - num_digits);
fill = static_cast<char_type>('0');
}
if (specs.align == align::none) specs.align = align::right;
out_ = write_padded(out_, specs, size, [=](reserve_iterator it) {
if (prefix.size() != 0) if (prefix.size() != 0)
it = copy_str<char_type>(prefix.begin(), prefix.end(), it); it = copy_str<char_type>(prefix.begin(), prefix.end(), it);
it = std::fill_n(it, padding, fill); it = std::fill_n(it, params.padding, params.fill);
f(it); f(it);
return it; return it;
}); });