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-rw-r--r--absl/time/time.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/absl/time/time.h b/absl/time/time.h
index 05347805..e236870b 100644
--- a/absl/time/time.h
+++ b/absl/time/time.h
@@ -179,6 +179,7 @@ class Duration {
Duration& operator%=(Duration rhs);
// Overloads that forward to either the int64_t or double overloads above.
+ // Integer operands must be representable as int64_t.
template <typename T>
Duration& operator*=(T r) {
int64_t x = r;
@@ -221,6 +222,7 @@ inline Duration operator+(Duration lhs, Duration rhs) { return lhs += rhs; }
inline Duration operator-(Duration lhs, Duration rhs) { return lhs -= rhs; }
// Multiplicative Operators
+// Integer operands must be representable as int64_t.
template <typename T>
Duration operator*(Duration lhs, T rhs) {
return lhs *= rhs;
@@ -375,7 +377,8 @@ constexpr Duration InfiniteDuration();
// Hours()
//
// Factory functions for constructing `Duration` values from an integral number
-// of the unit indicated by the factory function's name.
+// of the unit indicated by the factory function's name. The number must be
+// representable as int64_t.
//
// Note: no "Days()" factory function exists because "a day" is ambiguous.
// Civil days are not always 24 hours long, and a 24-hour duration often does