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efce575f1d
The default value of the ResultT template argument (which was there only to avoid spelling out the long std::result_of template multiple times) was being overriden by function call template argument deduction. This manifested itself as a compiler error when calling the function as FILE *X = RetryAfterSignal(nullptr, fopen, ...) because the function would try to assign the result of fopen to nullptr_t, but a more insidious side effect was that RetryAfterSignal(-1, read, ...) would return "int" instead of "ssize_t", losing precision along the way. I fix this by having the function take the argument in a way that prevents argument deduction from kicking in and add a test that makes sure the return type is correct. llvm-svn: 306003
39 lines
1.0 KiB
C++
39 lines
1.0 KiB
C++
//===- ErrnoTest.cpp - Error handling unit tests --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Errno.h"
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#include "gtest/gtest.h"
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using namespace llvm::sys;
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static int *ReturnPointer() { return new int(47); }
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TEST(ErrnoTest, RetryAfterSignal) {
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EXPECT_EQ(1, RetryAfterSignal(-1, [] { return 1; }));
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EXPECT_EQ(-1, RetryAfterSignal(-1, [] {
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errno = EAGAIN;
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return -1;
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}));
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EXPECT_EQ(EAGAIN, errno);
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unsigned calls = 0;
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EXPECT_EQ(1, RetryAfterSignal(-1, [&calls] {
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errno = EINTR;
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++calls;
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return calls == 1 ? -1 : 1;
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}));
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EXPECT_EQ(2u, calls);
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EXPECT_EQ(1, RetryAfterSignal(-1, [](int x) { return x; }, 1));
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std::unique_ptr<int> P{RetryAfterSignal(nullptr, ReturnPointer)};
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EXPECT_EQ(47, *P);
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}
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