Still more comments about strings

core/fxcrt/include/fx_string.h

Index: core/fxcrt/include/fx_string.h
diff --git a/core/fxcrt/include/fx_string.h b/core/fxcrt/include/fx_string.h
index 94df35c8e7f27ca24abfd62a76bc438e953ef114..2fabee39cf9cfc5ef65a3587be91b029cd1b567c 100644
--- a/core/fxcrt/include/fx_string.h
+++ b/core/fxcrt/include/fx_string.h
@@ -34,18 +34,19 @@ class CFX_ByteStringC {
     m_Length = size;
   }
 
+  // Deliberately implicit to avoid calling on every string literal.
   CFX_ByteStringC(const FX_CHAR* ptr) {
     m_Ptr = (const uint8_t*)ptr;
     m_Length = ptr ? FXSYS_strlen(ptr) : 0;
   }
 
+  // Deliberately implicit to avoid calling on every string literal.
   // |ch| must be an lvalue that outlives the the CFX_ByteStringC. However,
   // the use of char rvalues are not caught at compile time.  They are
   // implicitly promoted to CFX_ByteString (see below) and then the
   // CFX_ByteStringC is constructed from the CFX_ByteString via the alternate
   // constructor below. The CFX_ByteString then typically goes out of scope
   // and |m_Ptr| may be left pointing to invalid memory. Beware.
-  // TODO(tsepez): Mark single-argument string constructors as explicit.
   CFX_ByteStringC(FX_CHAR& ch) {
     m_Ptr = (const uint8_t*)&ch;
     m_Length = 1;
@@ -357,11 +358,19 @@ class CFX_WideStringC {
     m_Length = 0;
   }
 
+  // Deliberately implicit to avoid calling on every string literal.
   CFX_WideStringC(const FX_WCHAR* ptr) {
     m_Ptr = ptr;
     m_Length = ptr ? FXSYS_wcslen(ptr) : 0;
   }
 
+  // Deliberately implicit to avoid calling on every string literal.
+  // |ch| must be an lvalue that outlives the the CFX_WideStringC. However,
+  // the use of char rvalues are not caught at compile time.  They are
+  // implicitly promoted to CFX_WideString (see below) and then the
+  // CFX_WideStringC is constructed from the CFX_WideString via the alternate
+  // constructor below. The CFX_WideString then typically goes out of scope
+  // and |m_Ptr| may be left pointing to invalid memory. Beware.
   CFX_WideStringC(FX_WCHAR& ch) {
     m_Ptr = &ch;
     m_Length = 1;