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Move explicit specialization to namespace scope.

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This commit is contained in:
Thomas Harte 2025-03-07 23:41:56 -05:00
parent 4e882e7d4d
commit 96326411bf
1 changed files with 46 additions and 47 deletions
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93
Outputs/Log.hpp
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@ -138,57 +138,56 @@ constexpr const char *prefix(const Source source) {
}
}
template <Source source, bool enabled>
struct LogLine;
template <Source source>
struct LogLine<source, true> {
public:
explicit LogLine(FILE *const stream) noexcept : stream_(stream) {
const auto source_prefix = prefix(source);
if(!source_prefix) return;
output_.resize(strlen(source_prefix) + 4);
std::snprintf(output_.data(), output_.size(), "[%s] ", source_prefix);
output_.pop_back();
}
~LogLine() {
fprintf(stream_, "%s\n", output_.c_str());
}
template <size_t size, typename... Args>
void append(const char (&format)[size], Args... args) {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat"
const auto append_size = std::snprintf(nullptr, 0, format, args...);
const auto end = output_.size();
output_.resize(output_.size() + size_t(append_size) + 1);
std::snprintf(output_.data() + end, size_t(append_size) + 1, format, args...);
output_.pop_back();
#pragma GCC diagnostic pop
}
private:
std::string output_;
FILE *stream_;
};
template <Source source>
struct LogLine<source, false> {
explicit LogLine(FILE *) noexcept {}
template <size_t size, typename... Args>
void append(const char (&)[size], Args...) {}
};
template <Source source>
class Logger {
public:
static constexpr bool enabled = is_enabled(source);
template <bool enabled>
struct LogLine;
template <>
struct LogLine<true> {
public:
explicit LogLine(FILE *const stream) noexcept : stream_(stream) {
const auto source_prefix = prefix(source);
if(!source_prefix) return;
output_.resize(strlen(source_prefix) + 4);
std::snprintf(output_.data(), output_.size(), "[%s] ", source_prefix);
output_.pop_back();
}
~LogLine() {
fprintf(stream_, "%s\n", output_.c_str());
}
template <size_t size, typename... Args>
void append(const char (&format)[size], Args... args) {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat"
const auto append_size = std::snprintf(nullptr, 0, format, args...);
const auto end = output_.size();
output_.resize(output_.size() + size_t(append_size) + 1);
std::snprintf(output_.data() + end, size_t(append_size) + 1, format, args...);
output_.pop_back();
#pragma GCC diagnostic pop
}
private:
std::string output_;
FILE *stream_;
};
template <>
struct LogLine<false> {
explicit LogLine(FILE *) noexcept {}
template <size_t size, typename... Args>
void append(const char (&)[size], Args...) {}
};
LogLine<enabled> info() { return LogLine<enabled>(stdout); }
LogLine<enabled> error() { return LogLine<enabled>(stderr); }
LogLine<source, enabled> info() { return LogLine<source, enabled>(stdout); }
LogLine<source, enabled> error() { return LogLine<source, enabled>(stderr); }
};
}