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cb1beee76f
* __VA_OPT__ is expanded if the *expanded* __VA_ARGS__ is non-empty, not if the original argument contained no tokens. * Placemarkers at the start and end of __VA_OPT__ are retained just long enough to paste them with adjacent ## operators. We never paste "across" a discarded placemarker. llvm-svn: 359964
31 lines
683 B
C++
31 lines
683 B
C++
RUN: %clang_cc1 -E %s -pedantic -std=c++2a | FileCheck -strict-whitespace %s
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#define LPAREN() (
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#define G(Q) 42
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#define F1(R, X, ...) __VA_OPT__(G R X) )
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1: int x = F1(LPAREN(), 0, <:-);
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// CHECK: 1: int x = 42;
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#define F2(...) f(0 __VA_OPT__(,) __VA_ARGS__)
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#define EMP
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2: F2(EMP)
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// CHECK: 2: f(0 )
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#define H3(X, ...) #__VA_OPT__(X##X X##X)
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3: H3(, 0)
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// CHECK: 3: ""
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#define H4(X, ...) __VA_OPT__(a X ## X) ## b
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4: H4(, 1)
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// CHECK: 4: a b
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#define H4B(X, ...) a ## __VA_OPT__(X ## X b)
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4B: H4B(, 1)
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// CHECK: 4B: a b
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#define H5A(...) __VA_OPT__()/**/__VA_OPT__()
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#define H5B(X) a ## X ## b
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#define H5C(X) H5B(X)
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5: H5C(H5A())
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// CHECK: 5: ab
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