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Allow forward-declaration of level_enum

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spdlog::level::level_enum cannot be forward-declared at present, as
the definition does not specify an underlying type.

To allow users to make use of <spdlog/fwd.h> to refer to
level::level_enum without pulling in all of <spdlog/common.h> (which
can be quite costly), specify an underlying type (int) for
level::level_enum, then add a forward-declaration for it to
spdlog/fwd.h.

Note this required explicitly casting level_enum to size_t within ansicolor_sink due to sign-conversion errors:

    implicit conversion changes signedness: 'const level::level_enum' to 'std::__1::array::size_type' (aka 'unsigned long') [-Wsign-conversion]

It would appear that an enum with an unspecified underlying type is in
some kind of superposition - it can be treated as both signed _and_
unsigned - using an underlying type of 'unsigned int' triggers even
more warnings of this kind...
This commit is contained in:
Dave Rigby 2022-01-11 14:58:58 +00:00
parent 729d7f6d88
commit 2a4c34b878
3 changed files with 7 additions and 3 deletions
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2
include/spdlog/common.h
View File

@ -208,7 +208,7 @@ using level_t = std::atomic<int>;
// Log level enum
namespace level {
enum level_enum
enum level_enum : int
{
trace = SPDLOG_LEVEL_TRACE,
debug = SPDLOG_LEVEL_DEBUG,

4
include/spdlog/fwd.h
View File

@ -11,4 +11,8 @@ namespace sinks {
class sink;
}
namespace level {
enum level_enum : int;
}
} // namespace spdlog

4
include/spdlog/sinks/ansicolor_sink-inl.h
View File

@ -34,7 +34,7 @@ template<typename ConsoleMutex>
SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color(level::level_enum color_level, string_view_t color)
{
std::lock_guard<mutex_t> lock(mutex_);
colors_[color_level] = to_string_(color);
colors_[static_cast<size_t>(color_level)] = to_string_(color);
}
template<typename ConsoleMutex>
@ -52,7 +52,7 @@ SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::log(const details::log_msg &msg
// before color range
print_range_(formatted, 0, msg.color_range_start);
// in color range
print_ccode_(colors_[msg.level]);
print_ccode_(colors_[static_cast<size_t>(msg.level)]);
print_range_(formatted, msg.color_range_start, msg.color_range_end);
print_ccode_(reset);
// after color range