From 99692221b7c11f86852f21f2a7dc8d5fdae1863f Mon Sep 17 00:00:00 2001
From: mutouyun <mark.lonr@tom.com>
Date: Fri, 18 Jan 2019 14:11:30 +0800
Subject: [PATCH] try compatible with old compilers

---
 build/ipc.pro           | 2 +-
 build/test.pro          | 2 +-
 src/memory/resource.hpp | 4 ++++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/build/ipc.pro b/build/ipc.pro
index 6ed7355..5871c37 100644
--- a/build/ipc.pro
+++ b/build/ipc.pro
@@ -2,7 +2,7 @@ TEMPLATE = lib
 TARGET = ipc
 
 CONFIG -= qt
-CONFIG += c++14 c++1z
+CONFIG += c++14 c++17 c++1z
 
 !msvc:QMAKE_CXXFLAGS += -Wno-attributes -Wno-missing-field-initializers -Wno-unused-variable
 
diff --git a/build/test.pro b/build/test.pro
index c1b2635..3720cf8 100644
--- a/build/test.pro
+++ b/build/test.pro
@@ -4,7 +4,7 @@ QT += core testlib
 QT -= gui
 
 CONFIG += console
-CONFIG += c++14 c++1z
+CONFIG += c++14 c++17 c++1z
 CONFIG -= app_bundle
 
 DESTDIR = ../output
diff --git a/src/memory/resource.hpp b/src/memory/resource.hpp
index 548dab0..c3a6daf 100644
--- a/src/memory/resource.hpp
+++ b/src/memory/resource.hpp
@@ -27,7 +27,11 @@ constexpr decltype(auto) static_switch(std::size_t i, std::index_sequence<N, I..
 }
 
 template <typename F, std::size_t...I>
+#if __cplusplus >= 201703L
 constexpr void static_for(std::index_sequence<I...>, F&& f) {
+#else /*__cplusplus < 201703L*/
+inline void static_for(std::index_sequence<I...>, F&& f) {
+#endif/*__cplusplus < 201703L*/
     [[maybe_unused]] auto expand = { (f(std::integral_constant<size_t, I>{}), 0)... };
 }