From 82069fccd02054caa0f2c5b65a11c4751fbe5ca7 Mon Sep 17 00:00:00 2001
From: Megidd <megiddgit@gmail.com>
Date: Sat, 24 Apr 2021 16:55:30 +0430
Subject: [PATCH] Avoid boost build error

The error is:

> error: no template named 'conditional_t' in namespace 'std'; did you mean 'conditional'?

The template alias `conditional_t` is not available in C++11; it was added in C++14, as were most of the other type trait `*_t` versions. Therefore, C++14 is required to build the boost library.
---
 CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4081730..b566413 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -90,6 +90,11 @@ target_include_directories(libnest2d_headeronly INTERFACE $<BUILD_INTERFACE:${SR
 
 set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
 
+# require C++14
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
 add_library(libnest2d INTERFACE)
 
 if(NOT LIBNEST2D_HEADER_ONLY)