From af96a09e36a44f61d9f8c582a08b1dff9505fc0a Mon Sep 17 00:00:00 2001
From: mutouyun <orz@orzz.org>
Date: Sun, 28 May 2023 13:01:09 +0800
Subject: [PATCH] upd: [imp] output interface of the log should be const

---
 include/libimp/log.h      | 28 ++++++++++++++--------------
 test/imp/test_imp_log.cpp |  2 +-
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/libimp/log.h b/include/libimp/log.h
index 7bb0798..4231a40 100644
--- a/include/libimp/log.h
+++ b/include/libimp/log.h
@@ -114,8 +114,15 @@ class grip {
   char const *func_;
   level level_limit_;
 
+public:
+  template <typename O>
+  grip(char const *func, O &&out, level level_limit) noexcept 
+    : out_        (std::forward<O>(out))
+    , func_       (func)
+    , level_limit_(level_limit) {}
+
   template <typename... A>
-  grip &output(log::level l, A &&... args) noexcept {
+  grip const &operator()(log::level l, A &&... args) const noexcept {
     if (underlyof(l) < underlyof(level_limit_)) {
       return *this;
     }
@@ -128,19 +135,12 @@ class grip {
     return *this;
   }
 
-public:
-  template <typename O>
-  grip(char const *func, O &&out, level level_limit) noexcept 
-    : out_        (std::forward<O>(out))
-    , func_       (func)
-    , level_limit_(level_limit) {}
-
-  template <typename... A> grip &trace  (A &&...args) noexcept { return output(log::level::trace  , std::forward<A>(args)...); }
-  template <typename... A> grip &debug  (A &&...args) noexcept { return output(log::level::debug  , std::forward<A>(args)...); }
-  template <typename... A> grip &info   (A &&...args) noexcept { return output(log::level::info   , std::forward<A>(args)...); }
-  template <typename... A> grip &warning(A &&...args) noexcept { return output(log::level::warning, std::forward<A>(args)...); }
-  template <typename... A> grip &error  (A &&...args) noexcept { return output(log::level::error  , std::forward<A>(args)...); }
-  template <typename... A> grip &failed (A &&...args) noexcept { return output(log::level::failed , std::forward<A>(args)...); }
+  template <typename... A> grip const &trace  (A &&...args) const noexcept { return (*this)(log::level::trace  , std::forward<A>(args)...); }
+  template <typename... A> grip const &debug  (A &&...args) const noexcept { return (*this)(log::level::debug  , std::forward<A>(args)...); }
+  template <typename... A> grip const &info   (A &&...args) const noexcept { return (*this)(log::level::info   , std::forward<A>(args)...); }
+  template <typename... A> grip const &warning(A &&...args) const noexcept { return (*this)(log::level::warning, std::forward<A>(args)...); }
+  template <typename... A> grip const &error  (A &&...args) const noexcept { return (*this)(log::level::error  , std::forward<A>(args)...); }
+  template <typename... A> grip const &failed (A &&...args) const noexcept { return (*this)(log::level::failed , std::forward<A>(args)...); }
 };
 
 template <typename O>
diff --git a/test/imp/test_imp_log.cpp b/test/imp/test_imp_log.cpp
index 93e89a7..05a9ee7 100644
--- a/test/imp/test_imp_log.cpp
+++ b/test/imp/test_imp_log.cpp
@@ -23,7 +23,7 @@ TEST(log, custom) {
     std::string i;
     std::string e;
   } ll_data;
-  auto ll = [&ll_data](auto &&ctx) mutable {
+  auto ll = [&ll_data](auto &&ctx) {
     auto s = imp::fmt(ctx.params);
     if (ctx.level == imp::log::level::error) ll_data.e += s + " ";
     else