From 7316eb87b8ff3b2fa015cb0f2267f6041228b2c2 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Tue, 26 Nov 2024 00:55:58 +0200
Subject: [PATCH] BAN: Add requires expression for BAN::Formatter

This allows seeing syntax errors before compilation :)
---
 BAN/include/BAN/Formatter.h | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/BAN/include/BAN/Formatter.h b/BAN/include/BAN/Formatter.h
index 90d53e17..e8fd7a50 100644
--- a/BAN/include/BAN/Formatter.h
+++ b/BAN/include/BAN/Formatter.h
@@ -10,14 +10,11 @@ namespace BAN::Formatter
 
 	struct ValueFormat;
 
-	template<typename F>
-	inline void print(F putc, const char* format);
-
-	template<typename F, typename Arg, typename... Args>
-	inline void print(F putc, const char* format, Arg&& arg, Args&&... args);
-
 	template<typename F, typename... Args>
-	inline void println(F putc, const char* format, Args&&... args);
+	concept PrintableArguments = requires(F putc, Args&&... args, const ValueFormat& format)
+	{
+		(print_argument(putc, BAN::forward<Args>(args), format), ...);
+	};
 
 	template<typename F, typename T>
 	inline void print_argument(F putc, T value, const ValueFormat& format);
@@ -53,7 +50,7 @@ namespace BAN::Formatter
 		}
 	}
 
-	template<typename F, typename Arg, typename... Args>
+	template<typename F, typename Arg, typename... Args> requires PrintableArguments<F, Arg, Args...>
 	inline void print(F putc, const char* format, Arg&& arg, Args&&... args)
 	{
 		while (*format && *format != '{')