添加结构时catch2引发并出错

问题描述

这是我项目的根源。我认为我错过了一个基本概念，因为在将find()函数包装在结构中时会发生错误。

  CMakeLists.txt
  bst.cpp
  bst.hpp
  bst-test.cpp
  catch.hpp

CMakeLists.txt

cmake_minimum_required(VERSION 3.16.4 FATAL_ERROR)

project(bst LANGUAGES CXX)

set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD_required ON)

add_library(bst bst.cpp)

add_executable(bst-test bst-test.cpp)
target_link_libraries(bst-test bst)

enable_testing()

add_test(
         NAME catch_test
         COMMAND $<TARGET_FILE:bst-test> --success
         )

bst.cpp

struct Bst {
  int find(int num,int array[]) { return -1; }
};

bst.hpp

struct Bst {
  int find(int num,int array[]);
};

bst-test.cpp

#include "bst.hpp"
#define CATCH_CONfig_MAIN
#include "catch.hpp"

TEST_CASE("The number to search is not found in the list","[notFound]") {
  int array[]{};
  Bst tree;
  REQUIRE(tree.find(1,array) == -1);
}

这是尝试编译时的错误。

CMakeFiles/bst-test.dir/bst-test.cpp.o: In function `____C_A_T_C_H____T_E_S_T____0()':
bst-test.cpp:(.text+0x2b0b5): undefined reference to `Bst::find(int,int*)'
clang-11: error: linker command Failed with exit code 1 (use -v to see invocation)
CMakeFiles/bst-test.dir/build.make:84: recipe for target 'bst-test' Failed
make[2]: *** [bst-test] Error 1
CMakeFiles/Makefile2:104: recipe for target 'CMakeFiles/bst-test.dir/all' Failed
make[1]: *** [CMakeFiles/bst-test.dir/all] Error 2
Makefile:94: recipe for target 'all' Failed
make: *** [all] Error 2

解决方法

您正在.cpp文件中再次声明Bst结构。源文件应仅包含方法的定义，而不应包含结构的声明。

将bst.cpp更改为以下内容可修复错误：

#include "bst.hpp"
int Bst::find(int num,int array[]) { return -1; }