From 40a2c22e26d26cef2f71d701cf96b4aacc950e8b Mon Sep 17 00:00:00 2001
From: Richard <legalize@xmission.com>
Date: Tue, 30 Sep 2025 15:59:20 -0600
Subject: [PATCH] Add using declarations to bring placeholders _1, _2 into
 scope

Fixes #97
---
 examples/stepper_details.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/stepper_details.cpp b/examples/stepper_details.cpp
index 0368f8b4..873bfc00 100644
--- a/examples/stepper_details.cpp
+++ b/examples/stepper_details.cpp
@@ -15,6 +15,7 @@
 
 #include <iostream>
 #include <array>
+#include <functional>
 #include <boost/numeric/odeint.hpp>
 
 using namespace std;
@@ -119,6 +120,9 @@ int main( int argc , char **argv )
 
     // Symplectic harmonic oscillator example
     {
+        using std::placeholders::_1;
+        using std::placeholders::_2;
+
         double t( 0.0 ) , dt( 0.1 );
         //[ symplectic_stepper_detail_example
         pair< vector_type , vector_type > x;