为什么此宏接受带有1个参数的模板而拒绝带有2个参数的模板? [英] Why this macro accepts a template with 1 parameter and refuses a template with 2 parameters?

问题描述

我正在使用CPPUNIT 1.12.1.

I'm working with CPPUNIT 1.12.1.

它定义了那些宏:

#define CPPUNIT_TEST_SUITE_ADD_TEST( test ) \
      context.addTest( test )

#define CPPUNIT_TEST( testMethod )                        \
    CPPUNIT_TEST_SUITE_ADD_TEST(                           \
        ( new CPPUNIT_NS::TestCaller<TestFixtureType>(    \
                  context.getTestNameFor( #testMethod),   \
                  &TestFixtureType::testMethod,           \
                  context.makeFixture() ) ) )

我想使用模板将多个测试添加到同一测试套件中(随着CPPUNIT的工作，每个测试必须是一个void函数，因此使用模板可以使用不同的参数"调用同一void函数...).

I want to add many tests to the same test suite using templates (as CPPUNIT works, every test must be a void function, so using template makes it possible to call the same void function with different "parameters"...).

这很完美:

class MyTestSuite1 : public CPPUNIT_NS::TestFixture
{
    CPPUNIT_TEST_SUITE(MyTestSuite1);
    CPPUNIT_TEST(doTest<false>);
    CPPUNIT_TEST(doTest<true>);
    CPPUNIT_TEST_SUITE_END();

    template<bool param> void doTest() { /* test here */ }
};
CPPUNIT_TEST_SUITE_REGISTRATION(MyTestSuite1);

而事实并非如此:

class MyTestSuite2 : public CPPUNIT_NS::TestFixture
{
    CPPUNIT_TEST_SUITE(MyTestSuite2);
    CPPUNIT_TEST(doTest<false,false>);
    CPPUNIT_TEST(doTest<true,false>);
    CPPUNIT_TEST_SUITE_END();

    template<bool param1,bool param2> void doTest() { /* test here */ }
};
CPPUNIT_TEST_SUITE_REGISTRATION(MyTestSuite2);

编译器(Visual Studio 2015)报告:

Compiler (Visual Studio 2015) reports:

1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(20): 警告C4002:宏'CPPUNIT_TEST'的实际参数过多 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(21): 警告C4002:宏'CPPUNIT_TEST'的实际参数过多 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(20): 错误C2059:语法错误:')' 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(21): 错误C2059:语法错误:')' 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(22): 错误C2143:语法错误:缺少';'前 '}' 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(22): 错误C2065:名称":未声明的标识符 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(22): 错误C2065:工厂":未声明的标识符 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(22): 错误C2059:语法错误:')' 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(29): 错误C2143:语法错误:缺少';'前 '{' 1> b:\ dev \ vobs_diabeloop \ private \ tst \ regulation \ cppunit \ hyper_ftac3 \ test.cpp(30): 错误C2143:语法错误:缺少';'在"{"

1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(20): warning C4002: too many actual parameters for macro 'CPPUNIT_TEST' 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(21): warning C4002: too many actual parameters for macro 'CPPUNIT_TEST' 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(20): error C2059: syntax error: ')' 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(21): error C2059: syntax error: ')' 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(22): error C2143: syntax error: missing ';' before '}' 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(22): error C2065: 'namer': undeclared identifier 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(22): error C2065: 'factory': undeclared identifier 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(22): error C2059: syntax error: ')' 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(29): error C2143: syntax error: missing ';' before '{' 1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\hyper_ftac3\test.cpp(30): error C2143: syntax error: missing ';' before '{'

那是为什么?宏如何正确处理1个模板参数，但失败两个?知道如何轻松地进行编译和工作吗?

Why is that? How could the macro handle correctly 1 template parameter, but fails for two? Any idea how I could easily have it compile and work?

已经尝试CPPUNIT_TEST((doTest<false,false>));失败(获取error C2143: syntax error: missing ';' before ')')

Already tried CPPUNIT_TEST((doTest<false,false>)); without success (getting error C2143: syntax error: missing ';' before ')')

推荐答案

CPPUNIT_TEST(doTest<false,false>);

该命令不起作用，因为宏认为您正在传递2个宏参数:doTest<false和false>.

This one doesn't work because macro thinks you are passing 2 macro parameters: doTest<false and false>.

CPPUNIT_TEST((doTest<false,false>));

这不起作用，因为&TestFixtureType::testMethod将扩展为&TestFixtureType::(doTest<false,false>)，这是无效的.

This doesn't work because &TestFixtureType::testMethod will expand to &TestFixtureType::(doTest<false,false>) which is invalid.

正如Piotr在评论中提到的那样，您可以使用以下代码:

As mentioned by Piotr in comment, you can use this code:

#define COMMA ,
class MyTestSuite2 : public CPPUNIT_NS::TestFixture
{
    CPPUNIT_TEST_SUITE(MyTestSuite2);
    CPPUNIT_TEST(doTest<false COMMA false>);
    CPPUNIT_TEST(doTest<true COMMA  false>);
    CPPUNIT_TEST_SUITE_END();

    template<bool param1, bool param2> void doTest() { /* test here */ }
};
CPPUNIT_TEST_SUITE_REGISTRATION(MyTestSuite2);

因为预处理程序看到您要传递1个参数

Because pre-processor sees that you want to pass 1 parameter

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