Question

使用CMake时我无法使用std::unique_ptr<>。这个相同的代码在Visual Studio 2012上编译和运行完全正常，但在尝试在GCC 4.9.2上编译时，它抱怨以下错误：

test_uniqueptr/src/main.cpp:19:5: error: "unique_ptr" is not a member of "std"
     std::unique_ptr<Foo> p1(new Foo);  // p1 owns Foo
     ^
test_uniqueptr/src/main.cpp:19:24: error: expected primary-expression before ">" token
     std::unique_ptr<Foo> p1(new Foo);  // p1 owns Foo
                        ^
test_uniqueptr/src/main.cpp:19:36: error: "p1" was not declared in this scope
     std::unique_ptr<Foo> p1(new Foo);  // p1 owns Foo

还有另一个相关的错误：

test_uniqueptr/src/main.cpp:34:9: error: "EXIT_SUCCESS" was not declared in this scope.

我的源代码如下所示：

的src / main.cpp中：

#include <iostream>
#include <memory>

struct Foo
{
    Foo()      { std::cout << "Foo::Foo\n";  }
    ~Foo()     { std::cout << "Foo::~Foo\n"; }
    void bar() { std::cout << "Foo::bar\n";  }
};

void f(const Foo &)
{
    std::cout << "f(const Foo&)\n";
}

int main()
{
    std::unique_ptr<Foo> p1(new Foo);  // p1 owns Foo
    if (p1) p1->bar();

    {
        std::unique_ptr<Foo> p2(std::move(p1));  // now p2 owns Foo
        f(*p2);

        p1 = std::move(p2);  // ownership returns to p1
        std::cout << "destroying p2...\n";
    }

    if (p1) p1->bar();

    // Foo instance is destroyed when p1 goes out of scope

    return EXIT_SUCCESS;
}

的CMakeLists.txt：

CMAKE_MINIMUM_REQUIRED( VERSION 2.8 )

SET( PROJECT_NAME Test_UniquePtr ) # change project name here

SET( SOURCE_DIRECTORY ${PROJECT_SOURCE_DIR}/src )

# Done for temporary testing
FILE( GLOB MainSources
    "${SOURCE_DIRECTORY}/*.h"
    "${SOURCE_DIRECTORY}/*.cpp"
)

INCLUDE_DIRECTORIES(
    ${CMAKE_CURRENT_BINARY_DIR}
    ${CMAKE_CURRENT_SOURCE_DIR}
)

ADD_EXECUTABLE( 
    ${PROJECT_NAME} 
    ${MainSources} 
)

## Installation (optional)
SET_TARGET_PROPERTIES( ${PROJECT_NAME} PROPERTIES INSTALL_RPATH_USE_LINK_PATH TRUE )

INSTALL( TARGETS ${PROJECT_NAME} DESTINATION bin )

我读过的所有答案都表明要使用g++ main.cpp -std=c++11编译代码，但我希望通过CMake完成。

使用std :: unique_ptr＆lt;＆gt;的CMAKE问题与海湾合作委员会4.9

0 个答案: