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Use an enum for source, for compile-time disabling.

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This commit is contained in:
Thomas Harte 2024-01-19 10:35:34 -05:00
parent 07fe219148
commit e6ee8acfd6
1 changed files with 34 additions and 15 deletions
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49
Outputs/Log.hpp
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@ -8,26 +8,38 @@
#pragma once
namespace Log {
// TODO: if adopting C++20, std::format would be a better model to apply below.
// But I prefer C files to C++ streams, so here it is for now.
enum Category {
Info,
Error,
enum class Source {
WDFDC,
};
constexpr bool is_enabled(Source source) {
// Allow for compile-time source-level enabling and disabling of different sources.
switch(source) {
default: return true;
}
}
constexpr const char *prefix(Source source) {
switch(source) {
case Source::WDFDC: return "[WD FDC]";
}
}
#ifdef NDEBUG
class Logger {
public:
Logger(const char *) {}
Logger(Source) {}
struct LogLine {
void append(const char *, ...) {}
};
template <Category category> LogLine line() {
return LogLine();
}
LogLine info() { return LogLine(); }
LogLine error() { return LogLine(); }
};
#else
@ -37,21 +49,26 @@ class Logger {
class Logger {
public:
Logger(const char *prefix) : prefix_(prefix) {}
Logger(Source source) : source_(source) {}
struct LogLine {
public:
LogLine(const char *prefix, FILE *stream) : stream_(stream) {
if(prefix) {
fprintf(stream_, "%s ", prefix);
LogLine(Source source, FILE *stream) : source_(source), stream_(stream) {
if(!is_enabled(source_)) return;
const auto source_prefix = prefix(source);
if(source_prefix) {
fprintf(stream_, "%s ", source_prefix);
}
}
~LogLine() {
if(!is_enabled(source_)) return;
fprintf(stream_, "\n");
}
void append(const char *format, ...) {
if(!is_enabled(source_)) return;
va_list args;
va_start(args, format);
vfprintf(stream_, format, args);
@ -59,15 +76,17 @@ class Logger {
}
private:
Source source_;
FILE *stream_;
};
template <Category category> LogLine line() {
return LogLine(prefix_, category == Info ? stdout : stderr);
}
LogLine info() { return LogLine(source_, stdout); }
LogLine error() { return LogLine(source_, stderr); }
private:
const char *prefix_;
Source source_;
};
#endif
}