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Reduce the number of comparisons

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This commit is contained in:
Victor Zverovich
2020-05-29 05:42:35 -07:00
parent 28639969ef
commit 2c6165a22b
1 changed files with 9 additions and 1 deletions
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10
include/fmt/format.h
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@ -3175,6 +3175,14 @@ struct format_handler : detail::error_handler {
basic_format_arg<Context> arg; basic_format_arg<Context> arg;
}; };
template <typename Char>
bool equal2(const Char* lhs, const char* rhs) {
return lhs[0] == rhs[0] && lhs[1] == rhs[1];
}
inline bool equal2(const char* lhs, const char* rhs) {
return memcmp(lhs, rhs, 2) == 0;
}
/** Formats arguments and writes the output to the range. */ /** Formats arguments and writes the output to the range. */
template <typename ArgFormatter, typename Char, typename Context> template <typename ArgFormatter, typename Char, typename Context>
typename Context::iterator vformat_to( typename Context::iterator vformat_to(
@ -3182,7 +3190,7 @@ typename Context::iterator vformat_to(
basic_format_args<Context> args, basic_format_args<Context> args,
detail::locale_ref loc = detail::locale_ref()) { detail::locale_ref loc = detail::locale_ref()) {
format_handler<ArgFormatter, Char, Context> h(out, format_str, args, loc); format_handler<ArgFormatter, Char, Context> h(out, format_str, args, loc);
if (format_str.size() == 2 && format_str[0] == '{' && format_str[1] == '}') { if (format_str.size() == 2 && equal2(format_str.data(), "{}")) {
auto arg = detail::get_arg(h.context, 0); auto arg = detail::get_arg(h.context, 0);
h.parse_context.advance_to(&format_str[1]); h.parse_context.advance_to(&format_str[1]);
return visit_format_arg(ArgFormatter(h.context, &h.parse_context), arg); return visit_format_arg(ArgFormatter(h.context, &h.parse_context), arg);