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110 lines
3.5 KiB
C++
110 lines
3.5 KiB
C++
//===----------- VariadicFunctionTest.cpp - VariadicFunction unit tests ---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/VariadicFunction.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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// Defines a variadic function StringCat() to join strings.
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// StringCat()'s arguments and return value have class types.
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std::string StringCatImpl(ArrayRef<const std::string *> Args) {
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std::string S;
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for (unsigned i = 0, e = Args.size(); i < e; ++i)
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S += *Args[i];
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return S;
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}
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const VariadicFunction<std::string, std::string, StringCatImpl> StringCat = {};
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TEST(VariadicFunctionTest, WorksForClassTypes) {
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EXPECT_EQ("", StringCat());
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EXPECT_EQ("a", StringCat("a"));
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EXPECT_EQ("abc", StringCat("a", "bc"));
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EXPECT_EQ("0123456789abcdefghijklmnopqrstuv",
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StringCat("0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
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"a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
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"k", "l", "m", "n", "o", "p", "q", "r", "s", "t",
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"u", "v"));
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}
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// Defines a variadic function Sum(), whose arguments and return value
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// have primitive types.
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// The return type of SumImp() is deliberately different from its
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// argument type, as we want to test that this works.
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long SumImpl(ArrayRef<const int *> Args) {
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long Result = 0;
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for (unsigned i = 0, e = Args.size(); i < e; ++i)
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Result += *Args[i];
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return Result;
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}
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const VariadicFunction<long, int, SumImpl> Sum = {};
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TEST(VariadicFunctionTest, WorksForPrimitiveTypes) {
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EXPECT_EQ(0, Sum());
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EXPECT_EQ(1, Sum(1));
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EXPECT_EQ(12, Sum(10, 2));
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EXPECT_EQ(1234567, Sum(1000000, 200000, 30000, 4000, 500, 60, 7));
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}
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// Appends an array of strings to dest and returns the number of
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// characters appended.
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int StringAppendImpl(std::string *Dest, ArrayRef<const std::string *> Args) {
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int Chars = 0;
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for (unsigned i = 0, e = Args.size(); i < e; ++i) {
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Chars += Args[i]->size();
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*Dest += *Args[i];
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}
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return Chars;
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}
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const VariadicFunction1<int, std::string *, std::string,
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StringAppendImpl> StringAppend = {};
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TEST(VariadicFunction1Test, Works) {
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std::string S0("hi");
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EXPECT_EQ(0, StringAppend(&S0));
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EXPECT_EQ("hi", S0);
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std::string S1("bin");
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EXPECT_EQ(2, StringAppend(&S1, "go"));
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EXPECT_EQ("bingo", S1);
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std::string S4("Fab4");
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EXPECT_EQ(4 + 4 + 6 + 5,
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StringAppend(&S4, "John", "Paul", "George", "Ringo"));
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EXPECT_EQ("Fab4JohnPaulGeorgeRingo", S4);
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}
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// Counts how many optional arguments fall in the given range.
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// Returns the result in *num_in_range. We make the return type void
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// as we want to test that VariadicFunction* can handle it.
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void CountInRangeImpl(int *NumInRange, int Low, int High,
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ArrayRef<const int *> Args) {
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*NumInRange = 0;
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for (unsigned i = 0, e = Args.size(); i < e; ++i)
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if (Low <= *Args[i] && *Args[i] <= High)
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++(*NumInRange);
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}
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const VariadicFunction3<void, int *, int, int, int,
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CountInRangeImpl> CountInRange = {};
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TEST(VariadicFunction3Test, Works) {
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int N = -1;
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CountInRange(&N, -100, 100);
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EXPECT_EQ(0, N);
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CountInRange(&N, -100, 100, 42);
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EXPECT_EQ(1, N);
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CountInRange(&N, -100, 100, 1, 999, -200, 42);
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EXPECT_EQ(2, N);
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}
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} // namespace
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