SERVER-40389 use fmt in server, add readme file to third_party/fmt

2 files changed, 17 insertions, 8 deletions

diff --git a/src/mongo/base/data_type.cpp b/src/mongo/base/data_type.cpp
index 6c2d5444b08..879c7175b40 100644
--- a/src/mongo/base/data_type.cpp
+++ b/src/mongo/base/data_type.cpp
@@ -29,22 +29,27 @@
 
 #include "mongo/base/data_type.h"
 
+#include <fmt/format.h>
+
 #include "mongo/util/str.h"
 
 namespace mongo {
 
+namespace {
+auto makeOverflowStatus(StringData action, size_t sizeOfT, size_t length, size_t debug_offset) {
+    using namespace fmt::literals;
+    return Status(ErrorCodes::Overflow,
+                  "buffer size too small to {} ({}) bytes out of buffer[{}] at offset: {}"_format(
+                      action, sizeOfT, length, debug_offset));
+}
+}  // namespace
+
 Status DataType::makeTrivialLoadStatus(size_t sizeOfT, size_t length, size_t debug_offset) {
-    str::stream ss;
-    ss << "buffer size too small to read (" << sizeOfT << ") bytes out of buffer[" << length
-       << "] at offset: " << debug_offset;
-    return Status(ErrorCodes::Overflow, ss);
+    return makeOverflowStatus("read", sizeOfT, length, debug_offset);
 }
 
 Status DataType::makeTrivialStoreStatus(size_t sizeOfT, size_t length, size_t debug_offset) {
-    str::stream ss;
-    ss << "buffer size too small to write (" << sizeOfT << ") bytes into buffer[" << length
-       << "] at offset: " << debug_offset;
-    return Status(ErrorCodes::Overflow, ss);
+    return makeOverflowStatus("write", sizeOfT, length, debug_offset);
 }
 
 }  // namespace mongo
diff --git a/src/third_party/fmt/README-mongodb.md b/src/third_party/fmt/README-mongodb.md
new file mode 100644
index 00000000000..e87e59eae43
--- /dev/null
+++ b/src/third_party/fmt/README-mongodb.md
@@ -0,0 +1,4 @@
+
+Please read this wiki for notes on using fmt within the mongo project.
+https://wiki.corp.mongodb.com/display/HGTC/Using+the+fmt+Library
+