From 43c565fd3f7e5aa656f2a919ed45b7d4a0d146c9 Mon Sep 17 00:00:00 2001
From: Jamie <jamie.mcclymont@gmail.com>
Date: Wed, 8 Jan 2020 23:32:22 +1300
Subject: [PATCH] Allow compiling with no_metrics feature (#2)

---
 Cargo.toml          | 3 +++
 src/histogram.rs    | 2 ++
 src/io_uring/mod.rs | 1 +
 src/metrics.rs      | 1 +
 4 files changed, 7 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index cb8a0c5..c63a93c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,3 +14,6 @@ readme = "README.md"
 
 [dependencies]
 libc = "0.2.66"
+
+[features]
+no_metrics = []
diff --git a/src/histogram.rs b/src/histogram.rs
index 4f7b80b..d83a621 100644
--- a/src/histogram.rs
+++ b/src/histogram.rs
@@ -106,6 +106,8 @@ impl Histogram {
                 .fetch_add(1, Ordering::Relaxed)
                 + 1
         }
+        #[cfg(feature = "no_metrics")]
+        0
     }
 
     /// Retrieve a percentile [0-100]. Returns NAN if no metrics have been
diff --git a/src/io_uring/mod.rs b/src/io_uring/mod.rs
index 7d8251c..f4bceda 100644
--- a/src/io_uring/mod.rs
+++ b/src/io_uring/mod.rs
@@ -176,6 +176,7 @@ impl Drop for Uring {
         }
 
         if self.config.print_profile_on_drop {
+            #[cfg(not(feature = "no_metrics"))]
             M.print_profile();
         }
     }
diff --git a/src/metrics.rs b/src/metrics.rs
index b9852cb..6f8e0a7 100644
--- a/src/metrics.rs
+++ b/src/metrics.rs
@@ -106,6 +106,7 @@ pub struct Metrics {
 
 impl Drop for Metrics {
     fn drop(&mut self) {
+        #[cfg(not(feature = "no_metrics"))]
         self.print_profile()
     }
 }