From 3307244ce90bc11f939623f6d367f30db06bddf2 Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Sun, 17 Dec 2006 11:40:40 +0000 Subject: [PATCH] Added example of how to code print() methods so that they will disappear from the code if "cnull" is passed into them. llvm-svn: 32641 --- llvm/docs/CodingStandards.html | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/llvm/docs/CodingStandards.html b/llvm/docs/CodingStandards.html index 5b65fbc637c5..97e21fa65cc7 100644 --- a/llvm/docs/CodingStandards.html +++ b/llvm/docs/CodingStandards.html @@ -509,7 +509,7 @@ library. There are two problems with this:

more pressure on the VM system on low-memory machines. - +
@@ -520,8 +520,10 @@ library. There are two problems with this:

- - + + @@ -535,6 +537,12 @@ library. There are two problems with this:

+ + + + @@ -552,9 +560,14 @@ library. There are two problems with this:

// ... print(std::cerr); - +print(llvm::cerr); + + +
Old Way 
#include "llvm/Support/Streams.h"
 
DEBUG(std::cerr << ...);
DOUT << ...;
DEBUG(std::cerr << ...);
+DEBUG(dump(std::cerr));
DOUT << ...;
+dump(DOUT);
 
std::cerr << "Hello world\n";
 
std::cin >> Var;
 
llvm::cin >> Var;
N/A
llvm::cnull >> Var;
+
    N.B. Eats up argument Var outputting + nothing.
std::ostream
 
llvm::OStream
 
void print(std::ostream &Out);
+void print(std::ostream *Out) { if (Out) print(*Out) }
 // ...
-print(*llvm::cerr.stream());