Micro-optimizations related to std::string

* Rely on the fact that a std::string is empty by default
* Use std::string::empty() rather than comparing to ""
* Construct with std::string() rather than from ""

Reviewed-by: Bertram

1 files changed, 1 insertions, 1 deletions

diff --git a/src/utils/sha256.cpp b/src/utils/sha256.cpp
index ba6a5078..102171e9 100644
--- a/src/utils/sha256.cpp
+++ b/src/utils/sha256.cpp
@@ -263,7 +263,7 @@ std::string SHA256Hash(const char *src, int len)
     SHA256Final(&ctx, bytehash);
     // Convert it to hex
     const char* hxc = "0123456789abcdef";
-    std::string hash = "";
+    std::string hash;
     for (int i = 0; i < SHA256_DIGEST_SIZE; i++)
     {
         hash += hxc[bytehash[i] / 16];