From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Tyler Veness <calcmogul@gmail.com>
Date: Wed, 29 May 2024 16:29:55 -0700
Subject: [PATCH 1/8] Use fmtlib

---
 include/sleipnir/optimization/problem.hpp |  1 +
 include/sleipnir/util/assert.hpp          |  5 ++--
 include/sleipnir/util/print.hpp           | 31 +++++++++++++----------
 3 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/include/sleipnir/optimization/problem.hpp b/include/sleipnir/optimization/problem.hpp
index 3185466605b6604068e2807e461d07d8c856c505..95a33952a5a368c7c81491dbe849a8096357dc38 100644
--- a/include/sleipnir/optimization/problem.hpp
+++ b/include/sleipnir/optimization/problem.hpp
@@ -15,6 +15,7 @@
 
 #include <Eigen/Core>
 #include <Eigen/SparseCore>
+#include <fmt/chrono.h>
 #include <gch/small_vector.hpp>
 
 #include "sleipnir/autodiff/expression_type.hpp"
diff --git a/include/sleipnir/util/assert.hpp b/include/sleipnir/util/assert.hpp
index 0846928c3da7a6047a3c271dd2d377a3b755eeab..5d432608def05b6dee6b7cbdb9a0b91a6ab5e1c2 100644
--- a/include/sleipnir/util/assert.hpp
+++ b/include/sleipnir/util/assert.hpp
@@ -4,10 +4,11 @@
 
 #ifdef SLEIPNIR_PYTHON
 
-#include <format>
 #include <source_location>
 #include <stdexcept>
 
+#include <fmt/format.h>
+
 /**
  * Throw an exception in Python.
  */
@@ -15,7 +16,7 @@
   do {                                                               \
     if (!(condition)) {                                              \
       auto location = std::source_location::current();               \
-      throw std::invalid_argument(std::format(                       \
+      throw std::invalid_argument(fmt::format(                       \
           "{}:{}: {}: Assertion `{}' failed.", location.file_name(), \
           location.line(), location.function_name(), #condition));   \
     }                                                                \
diff --git a/include/sleipnir/util/print.hpp b/include/sleipnir/util/print.hpp
index 797df849f63d960cf10eaf847415595961868ab0..a89b7d4f9864965443405a8e79cddd8dbfc54ad3 100644
--- a/include/sleipnir/util/print.hpp
+++ b/include/sleipnir/util/print.hpp
@@ -4,10 +4,15 @@
 
 #ifndef SLEIPNIR_DISABLE_DIAGNOSTICS
 #include <cstdio>
-#include <print>
 #include <system_error>
 #include <utility>
 
+#if __has_include(<fmt/base.h>)
+#include <fmt/base.h>
+#else
+#include <fmt/core.h>
+#endif
+
 #endif
 
 namespace slp {
@@ -15,45 +20,45 @@ namespace slp {
 #ifndef SLEIPNIR_DISABLE_DIAGNOSTICS
 
 /**
- * Wrapper around std::print() that squelches write failure exceptions.
+ * Wrapper around fmt::print() that squelches write failure exceptions.
  */
 template <typename... T>
-void print(std::format_string<T...> fmt, T&&... args) {
+void print(fmt::format_string<T...> fmt, T&&... args) {
   try {
-    std::print(fmt, std::forward<T>(args)...);
+    fmt::print(fmt, std::forward<T>(args)...);
   } catch (const std::system_error&) {
   }
 }
 
 /**
- * Wrapper around std::print() that squelches write failure exceptions.
+ * Wrapper around fmt::print() that squelches write failure exceptions.
  */
 template <typename... T>
-void print(std::FILE* f, std::format_string<T...> fmt, T&&... args) {
+void print(std::FILE* f, fmt::format_string<T...> fmt, T&&... args) {
   try {
-    std::print(f, fmt, std::forward<T>(args)...);
+    fmt::print(f, fmt, std::forward<T>(args)...);
   } catch (const std::system_error&) {
   }
 }
 
 /**
- * Wrapper around std::println() that squelches write failure exceptions.
+ * Wrapper around fmt::println() that squelches write failure exceptions.
  */
 template <typename... T>
-void println(std::format_string<T...> fmt, T&&... args) {
+void println(fmt::format_string<T...> fmt, T&&... args) {
   try {
-    std::println(fmt, std::forward<T>(args)...);
+    fmt::println(fmt, std::forward<T>(args)...);
   } catch (const std::system_error&) {
   }
 }
 
 /**
- * Wrapper around std::println() that squelches write failure exceptions.
+ * Wrapper around fmt::println() that squelches write failure exceptions.
  */
 template <typename... T>
-void println(std::FILE* f, std::format_string<T...> fmt, T&&... args) {
+void println(std::FILE* f, fmt::format_string<T...> fmt, T&&... args) {
   try {
-    std::println(f, fmt, std::forward<T>(args)...);
+    fmt::println(f, fmt, std::forward<T>(args)...);
   } catch (const std::system_error&) {
   }
 }