Add fast versions for function toString for different types.

3 files changed, 109 insertions, 10 deletions

diff --git a/src/utils/stringutils.cpp b/src/utils/stringutils.cpp
index b4e6e01b0..706135a56 100644
--- a/src/utils/stringutils.cpp
+++ b/src/utils/stringutils.cpp
@@ -709,6 +709,80 @@ std::string toStringPrint(const unsigned int val)
     return str;
 }
 
+std::string toString(unsigned int num)
+{
+    char buf[30];
+    buf[29] = '\0';
+    size_t idx = 28;
+    do
+        buf[idx--] = static_cast<char>((num % 10) + '0');
+    while(num /= 10);
+    return buf + idx + 1;
+}
+
+std::string toString(size_t num)
+{
+    char buf[100];
+    buf[99] = '\0';
+    size_t idx = 98;
+    do
+        buf[idx--] = static_cast<char>((num % 10) + '0');
+    while(num /= 10);
+    return buf + idx + 1;
+}
+
+std::string toString(uint16_t num)
+{
+    char buf[10];
+    buf[9] = '\0';
+    size_t idx = 8;
+    do
+        buf[idx--] = static_cast<char>((num % 10) + '0');
+    while(num /= 10);
+    return buf + idx + 1;
+}
+
+std::string toString(unsigned char num)
+{
+    char buf[5];
+    buf[4] = '\0';
+    size_t idx = 3;
+    do
+        buf[idx--] = static_cast<char>((num % 10) + '0');
+    while(num /= 10);
+    return buf + idx + 1;
+}
+
+std::string toString(int num)
+{
+    char buf[30];
+    bool useSign(false);
+    buf[29] = '\0';
+    size_t idx = 28;
+
+    if (num < 0)
+    {
+        useSign = true;
+        num = -num;
+    }
+    do
+        buf[idx--] = static_cast<char>((num % 10) + '0');
+    while(num /= 10);
+    if (useSign)
+        buf[idx--] = '-';
+    return buf + idx + 1;
+}
+
+std::string toString(float num)
+{
+    return strprintf("%f", num);
+}
+
+std::string toString(double num)
+{
+    return strprintf("%f", static_cast<float>(num));
+}
+
 bool isDigit(const std::string &str)
 {
     if (str.empty())
diff --git a/src/utils/stringutils.h b/src/utils/stringutils.h
index da75a42fa..cc479d80c 100644
--- a/src/utils/stringutils.h
+++ b/src/utils/stringutils.h
@@ -64,20 +64,25 @@ std::string &toUpper(std::string &str);
  */
 unsigned int atox(const std::string &str) A_WARN_UNUSED;
 
-template<typename T> std::string toString(const T &arg) A_WARN_UNUSED;
-
 /**
- * Converts the given value to a string using std::stringstream.
+ * Converts the given value to a string.
  *
- * @param arg the value to convert to a string
+ * @param num the value to convert to a string
  * @return the string representation of arg
  */
-template<typename T> std::string toString(const T &arg)
-{
-    std::stringstream ss;
-    ss << arg;
-    return ss.str();
-}
+std::string toString(unsigned int num);
+
+std::string toString(size_t num);
+
+std::string toString(unsigned char num);
+
+std::string toString(int num);
+
+std::string toString(uint16_t num);
+
+std::string toString(float num);
+
+std::string toString(double num);
 
 std::string toStringPrint(const unsigned int val);
 
diff --git a/src/utils/stringutils_unittest.cc b/src/utils/stringutils_unittest.cc
index f984167a6..4dca829d7 100644
--- a/src/utils/stringutils_unittest.cc
+++ b/src/utils/stringutils_unittest.cc
@@ -117,6 +117,26 @@ TEST_CASE("stringuntils ipToString 1")
     REQUIRE("219.255.210.73" == std::string(ipToString(1238564827)));
 }
 
+TEST_CASE("stringuntils toString 1")
+{
+    REQUIRE(strprintf("%d", 0) == toString(0));
+    REQUIRE(strprintf("%d", -1) == toString(-1));
+    REQUIRE(strprintf("%d", 30000000) == toString(30000000));
+    REQUIRE(strprintf("%d", -10000000) == toString(-10000000));
+    REQUIRE(strprintf("%d", 30000000) == toString(
+        static_cast<signed int>(30000000)));
+    REQUIRE(strprintf("%d", 3000) == toString(static_cast<uint16_t>(3000)));
+    REQUIRE(strprintf("%d", 123) == toString(static_cast<unsigned char>(123)));
+}
+
+TEST_CASE("stringuntils toString 2")
+{
+    for (int f = 0; f < 10000000; f += 123)
+    {
+        REQUIRE(strprintf("%d", f) == toString(f));
+    }
+}
+
 TEST_CASE("stringuntils removeColors 1")
 {
     REQUIRE("" == removeColors(""));