From 6f57c222c17bfa488d78193554dc5237c3305594 Mon Sep 17 00:00:00 2001
From: "Dirk O. Kaar" <dok@dok-net.net>
Date: Sat, 18 Apr 2020 10:07:08 +0200
Subject: [PATCH] Eliminate code duplication by template for
 printNumber(...)/printFloat(...).

Move template defintion into cpp file - valid for private member function templates.
---
 cores/esp8266/Print.cpp | 33 +++++++++------------------------
 cores/esp8266/Print.h   | 17 +++++------------
 2 files changed, 14 insertions(+), 36 deletions(-)

diff --git a/cores/esp8266/Print.cpp b/cores/esp8266/Print.cpp
index f6fd2ec74..186d6e1cb 100644
--- a/cores/esp8266/Print.cpp
+++ b/cores/esp8266/Print.cpp
@@ -178,7 +178,7 @@ size_t Print::print(unsigned long long n, int base) {
 }
 
 size_t Print::print(double n, int digits) {
-    return printFloat(n, digits);
+    return printNumber(n, digits);
 }
 
 size_t Print::print(const Printable& x) {
@@ -243,29 +243,14 @@ size_t Print::println(const Printable& x) {
 
 // Private Methods /////////////////////////////////////////////////////////////
 
-size_t Print::printNumber(unsigned long n, uint8_t base) {
-    char buf[8 * sizeof(n) + 1]; // Assumes 8-bit chars plus zero byte.
-    char *str = &buf[sizeof(buf) - 1];
+template<typename T, typename... P> inline size_t Print::_println(T v, P... args)
+{
+    size_t n = print(v, args...);
+    n += println();
+    return n;
+};
 
-    *str = '\0';
-
-    // prevent crash if called with base == 1
-    if(base < 2) {
-        base = 10;
-    }
-
-    do {
-        auto m = n;
-        n /= base;
-        char c = m - base * n;
-
-        *--str = c < 10 ? c + '0' : c + 'A' - 10;
-    } while (n);
-
-    return write(str);
-}
-
-size_t Print::printNumber(unsigned long long n, uint8_t base) {
+template<typename T> size_t Print::printNumber(T n, uint8_t base) {
     char buf[8 * sizeof(n) + 1]; // Assumes 8-bit chars plus zero byte.
     char* str = &buf[sizeof(buf) - 1];
 
@@ -287,7 +272,7 @@ size_t Print::printNumber(unsigned long long n, uint8_t base) {
     return write(str);
 }
 
-size_t Print::printFloat(double number, uint8_t digits) {
+template<> size_t Print::printNumber(double number, uint8_t digits) {
     char buf[40];
     return write(dtostrf(number, 0, digits, buf));
 }
diff --git a/cores/esp8266/Print.h b/cores/esp8266/Print.h
index edfd7f7d6..e49332b31 100644
--- a/cores/esp8266/Print.h
+++ b/cores/esp8266/Print.h
@@ -36,18 +36,9 @@
 class Print {
     private:
         int write_error;
-        size_t printNumber(unsigned long, uint8_t);
-        size_t printNumber(unsigned long long, uint8_t);
-        size_t printFloat(double, uint8_t);
-
-        template<typename T, typename... P> inline size_t _println(T v, P... args)
-        {
-            size_t n = print(v, args...);
-            n += println();
-            return n;
-        };
-
-    protected:
+        template<typename T> size_t printNumber(T n, uint8_t base);
+        template<typename T, typename... P> inline size_t _println(T v, P... args);
+protected:
         void setWriteError(int err = 1) {
             write_error = err;
         }
@@ -120,4 +111,6 @@ class Print {
         virtual void flush() { /* Empty implementation for backward compatibility */ }
 };
 
+template<> size_t Print::printNumber(double number, uint8_t digits);
+
 #endif