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Add raw_null_ostream and llvm::nulls(), a raw_ostream that discards output.
- No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76103 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -327,6 +327,9 @@ raw_ostream &outs();
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/// Use it like: errs() << "foo" << "bar";
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raw_ostream &errs();
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/// nulls() - This returns a reference to a raw_ostream which simply discards
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/// output.
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raw_ostream &nulls();
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//===----------------------------------------------------------------------===//
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// Output Stream Adaptors
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@ -399,6 +402,19 @@ public:
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uint64_t tell();
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};
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/// raw_null_ostream - A raw_ostream that discards all output.
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class raw_null_ostream : public raw_ostream {
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/// write_impl - See raw_ostream::write_impl.
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virtual void write_impl(const char *Ptr, size_t size);
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/// current_pos - Return the current position within the stream, not
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/// counting the bytes currently in the buffer.
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virtual uint64_t current_pos();
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public:
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explicit raw_null_ostream() {}
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};
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} // end llvm namespace
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#endif
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@ -375,6 +375,12 @@ raw_ostream &llvm::errs() {
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return S;
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}
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/// nulls() - This returns a reference to a raw_ostream which discards output.
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raw_ostream &llvm::nulls() {
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static raw_null_ostream S;
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return S;
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}
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//===----------------------------------------------------------------------===//
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// raw_os_ostream
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//===----------------------------------------------------------------------===//
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@ -422,3 +428,14 @@ uint64_t raw_svector_ostream::current_pos() { return OS.size(); }
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uint64_t raw_svector_ostream::tell() {
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return OS.size() + GetNumBytesInBuffer();
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}
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//===----------------------------------------------------------------------===//
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// raw_null_ostream
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//===----------------------------------------------------------------------===//
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void raw_null_ostream::write_impl(const char *Ptr, size_t Size) {
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}
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uint64_t raw_null_ostream::current_pos() {
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return 0;
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}
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