[lmi-commits] [lmi] master 33c0f82 3/4: Speed up ledger_format() [Ilja]

[Greg Chicares]

branch: master
commit 33c0f82b596fa610528f175b3eaaef97900798b9
Author: Gregory W. Chicares <address@hidden>
Commit: Gregory W. Chicares <address@hidden>

    Speed up ledger_format() [Ilja]
    
    Initializing the std::stringstream OAOO (see recent changes in the unit
    test) makes PDF generation about ten percent faster.
---
 ledger_text_formats.cpp | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/ledger_text_formats.cpp b/ledger_text_formats.cpp
index 3497602..48eb6a6 100644
--- a/ledger_text_formats.cpp
+++ b/ledger_text_formats.cpp
@@ -1202,11 +1202,18 @@ std::string ledger_format
     ,std::pair<int,oenum_format_style> f
     )
 {
-    std::stringstream interpreter;
-    std::locale loc;
-    std::locale new_loc(loc, new comma_punct);
-    interpreter.imbue(new_loc);
-    interpreter.setf(std::ios_base::fixed, std::ios_base::floatfield);
+    static std::stringstream interpreter = []
+        {
+        std::stringstream ss {};
+        std::locale loc;
+        std::locale new_loc(loc, new comma_punct);
+        ss.imbue(new_loc);
+        ss.setf(std::ios_base::fixed, std::ios_base::floatfield);
+        return ss;
+        } ();
+    interpreter.str(std::string{});
+    interpreter.clear();
+
     interpreter.precision(f.first);
     std::string s;
     if(f.second)