主页 / user-5999841

pacmaninbw's questions

Martin Hope
pacmaninbw
Asked: 2025-02-11 06:57:31 +0800 CST
  • 9

在此处输入图片描述

我正在用 Qt 6.8 C++23 编写一个简单的工具来了解 Qt。Ubuntu 22.04 VS Code。

我有 2 个 QLineEdit 用于源目录和目标目录。当用户关注行编辑时，该工具应该打开 QFileDialog，这样他们就不必输入完整路径。行编辑本身应该是只读的。

包含对话框的源代码可以在 GitHub 上找到。

问题是，当文件对话框关闭时，它会立即重新打开，因为焦点仍然在行编辑上。如何在文件对话框关闭后失去焦点？

#ifndef DIRECTORYLINEEDIT_H_
#define DIRECTORYLINEEDIT_H_

#include <QLineEdit>
#include <QFileDialog>
class DirectoryLineEdit : public QLineEdit {
    Q_OBJECT

public:
    explicit DirectoryLineEdit(const char* dleName, const char* title, int leWidth, QWidget *parent = nullptr)
    : QLineEdit{parent}, fileDialogTitle{title}
    {
        setObjectName(QString::fromUtf8(dleName));
        setStyleSheet("width: " + QString::number(leWidth) + "px;");
        setReadOnly(true);
    }

    void focusInEvent(QFocusEvent *event)
    {
        QString textToChange = text();
    
        textToChange = QFileDialog::getExistingDirectory(nullptr, fileDialogTitle,
            textToChange, QFileDialog::ShowDirsOnly | QFileDialog::DontResolveSymlinks);
    
        setText(textToChange);    
    }
    

private:
    QString fileDialogTitle;
};

#endif // DIRECTORYLINEEDIT_H_
c++
Martin Hope
pacmaninbw
Asked: 2024-11-26 01:13:05 +0800 CST
  • 6

我正在尝试获取一个接受范围的构造函数，该范围可以是向量或用户定义结构的数组。

我正在使用 std::convertible_to<>

编译器错误消息是我调用构造函数的地方。

`GenericDictionary<TestFunctionalityEnumDict, std::string> dictionary(testPostivePathVec);`

./SO_Minimize_Code/unitTests/ptp_vector.cpp: In function ‘int main()’:
./SO_Minimize_Code/unitTests/ptp_vector.cpp:27:92: error: no matching function for call to ‘GenericDictionary<TestFunctionalityEnumDict, std::__cxx11::basic_string<char>

我怎样才能TestDataPair转换为DictType？

通用词典.h

#ifndef GENERICDICTIONARY_H_
#define GENERICDICTIONARY_H_

#include <concepts>
#include <ranges>
#include <string>
#include <vector>

template <typename DictID, typename DictName>
class GenericDictionary
{
public:
    struct DictType
    {
        DictID id;
        DictName names;
    };

    template<std::ranges::input_range R>
    requires std::convertible_to<std::ranges::range_reference_t<R>, DictType>
    GenericDictionary(R&& definitions)
    : userInputList{std::ranges::begin(definitions), std::ranges::end(definitions)}
    {
    }
    virtual ~GenericDictionary() = default;

private:

    std::vector<DictType> userInputList;
};

#endif // GENERICDICTIONARY_H_

#include "GenericDictionary.h"
#include <string>
#include <vector>

enum class TestFunctionalityEnumDict
{
    FunctionalTest_0,
    FunctionalTest_1,
    FunctionalTest_2
};

struct TestDataPair
{
    TestFunctionalityEnumDict id;
    std::string names;
};

std::vector<TestDataPair> testPostivePathVec = 
{
    {TestFunctionalityEnumDict::FunctionalTest_0, "Functional Test Str 0"},
    {TestFunctionalityEnumDict::FunctionalTest_1, "Functional Test Str 1"},
    {TestFunctionalityEnumDict::FunctionalTest_2, "Functional Test Str 2"}
};

int main()
{
    GenericDictionary<TestFunctionalityEnumDict, std::string> dictionary(testPostivePathVec);
    
    return EXIT_SUCCESS;
}

完整的错误消息

[1/2] Building CXX object unitTests/CMakeFiles/ptp_vector.dir/ptp_vector.cpp.o
FAILED: unitTests/CMakeFiles/ptp_vector.dir/ptp_vector.cpp.o 
/usr/bin/g++-12  -I./SO_Minimize_Code/. -I./SO_Minimize_Code/./unitTests -Wall -Wextra -pedantic -fprofile-arcs -ftest-coverage -g -std=gnu++23 -Werror -MD -MT unitTests/CMakeFiles/ptp_vector.dir/ptp_vector.cpp.o -MF unitTests/CMakeFiles/ptp_vector.dir/ptp_vector.cpp.o.d -o unitTests/CMakeFiles/ptp_vector.dir/ptp_vector.cpp.o -c ./SO_Minimize_Code/unitTests/ptp_vector.cpp
./SO_Minimize_Code/unitTests/ptp_vector.cpp: In function ‘int main()’:
./SO_Minimize_Code/unitTests/ptp_vector.cpp:27:92: error: no matching function for call to ‘GenericDictionary<TestFunctionalityEnumDict, std::__cxx11::basic_string<char> >::GenericDictionary(std::vector<TestDataPair>&)’
   27 |     GenericDictionary<TestFunctionalityEnumDict, std::string> dictionary(testPostivePathVec);
      |                                                                                            ^
In file included from ./SO_Minimize_Code/unitTests/ptp_vector.cpp:1:
./SO_Minimize_Code/./GenericDictionary.h:21:5: note: candidate: ‘template<class R>  requires (input_range<R>) && (convertible_to<typename std::__detail::__iter_traits_impl<typename std::remove_cvref<decltype(std::ranges::__cust_access::__begin((declval<_Range&>)()))>::type, std::indirectly_readable_traits<typename std::remove_cvref<decltype(std::ranges::__cust_access::__begin((declval<_Range&>)()))>::type> >::__iter_traits<typename std::remove_cvref<decltype(std::ranges::__cust_access::__begin((declval<_Range&>)()))>::type, std::indirectly_readable_traits<typename std::remove_cvref<decltype(std::ranges::__cust_access::__begin((declval<_Range&>)()))>::type> >::value_type, GenericDictionary<DictID, DictName>::DictType>) GenericDictionary<DictID, DictName>::GenericDictionary(R&&) [with DictID = TestFunctionalityEnumDict; DictName = std::__cxx11::basic_string<char>]’
   21 |     GenericDictionary(R&& definitions)
      |     ^~~~~~~~~~~~~~~~~
./SO_Minimize_Code/./GenericDictionary.h:21:5: note:   template argument deduction/substitution failed:
./SO_Minimize_Code/./GenericDictionary.h:21:5: note: constraints not satisfied
In file included from ./SO_Minimize_Code/./GenericDictionary.h:4:
/usr/include/c++/12/concepts: In substitution of ‘template<class R>  requires (input_range<R>) && (convertible_to<typename std::__detail::__iter_traits_impl<typename std::remove_cvref<decltype(std::ranges::__cust_access::__begin((declval<_Range&>)()))>::type, std::indirectly_readable_traits<typename std::remove_cvref<decltype(std::ranges::__cust_access::__begin((declval<_Range&>)()))>::type> >::__iter_traits<typename std::remove_cvref<decltype(std::ranges::__cust_access::__begin((declval<_Range&>)()))>::type, std::indirectly_readable_traits<typename std::remove_cvref<decltype(std::ranges::__cust_access::__begin((declval<_Range&>)()))>::type> >::value_type, GenericDictionary<DictID, DictName>::DictType>) GenericDictionary<TestFunctionalityEnumDict, std::__cxx11::basic_string<char> >::GenericDictionary(R&&) [with R = TestFunctionalityEnumDict]’:
./SO_Minimize_Code/unitTests/ptp_vector.cpp:27:92:   required from here
/usr/include/c++/12/concepts:72:13:   required for the satisfaction of ‘convertible_to<std::ranges::range_value_t<_Range>, GenericDictionary<DictID, DictName>::DictType>’ [with R = std::vector<TestDataPair, std::allocator<TestDataPair> >&; DictID = TestFunctionalityEnumDict; DictName = std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >]
/usr/include/c++/12/concepts:72:30: note: the expression ‘is_convertible_v<_From, _To> [with _From = TestDataPair; _To = GenericDictionary<TestFunctionalityEnumDict, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::DictType]’ evaluated to ‘false’
   72 |     concept convertible_to = is_convertible_v<_From, _To>
      |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
./SO_Minimize_Code/./GenericDictionary.h:10:7: note: candidate: ‘constexpr GenericDictionary<TestFunctionalityEnumDict, std::__cxx11::basic_string<char> >::GenericDictionary(const GenericDictionary<TestFunctionalityEnumDict, std::__cxx11::basic_string<char> >&)’
   10 | class GenericDictionary
      |       ^~~~~~~~~~~~~~~~~
./SO_Minimize_Code/./GenericDictionary.h:10:7: note:   no known conversion for argument 1 from ‘std::vector<TestDataPair>’ to ‘const GenericDictionary<TestFunctionalityEnumDict, std::__cxx11::basic_string<char> >&’
ninja: build stopped: subcommand failed.
c++
Martin Hope
pacmaninbw
Asked: 2024-11-14 01:06:26 +0800 CST
  • 7

我有一个包含 2 个子目录的顶级 CMakeLists.txt 文件。只要 cmake 命令行上没有 -j 或 --parallel，它就可以正确构建。CMakeLists.txt 文件记录了这个问题。除了记录问题之外，还有其他方法可以防止 CMakeLists.txt 文件中的并行构建吗？

cmake_minimum_required(VERSION 3.25)

# Do not attempt to build in parallel using either --parallel or -j
# There can be a race codition between generating the performance test
# header file and building the tests.

project(TestDictionary LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_subdirectory(src/PerformanceTestGenerator)
add_subdirectory(src/tests)

cmake_minimum_required(VERSION 3.25)

project(createPerformanceTest LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_executable(createPerformanceTest main.cpp PerformanceTestGenerator.cpp TestParameters.cpp)

target_compile_features(createPerformanceTest PUBLIC cxx_std_23)

if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
    # warning level 4 and all warnings as errors
    target_compile_options(createPerformanceTest PRIVATE /W3 /WX -D_CRT_SECURE_NO_WARNINGS)
elseif (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
        # require at least gcc 12 to get full C++20 support
        if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12)
            message(FATAL_ERROR "GCC version must be at least 12!")
        endif()
    endif()
    # lots of warnings and all warnings as errors
    target_compile_options(createPerformanceTest PRIVATE -Wall -Wextra -pedantic -Werror)
endif()

add_custom_command(
  OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/performanceTest.h
  COMMAND createPerformanceTest --output-file ${CMAKE_CURRENT_SOURCE_DIR}/performanceTest.h --test-count 3 --radix-16 --test-size 10 --test-size 20 --test-size ff --both-tests
  COMMENT "Generating performanceTest.h header file"
  VERBATIM
)

add_custom_target(
  GeneratedHeader ALL
  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/performanceTest.h
)

cmake_minimum_required(VERSION 3.25)

project(testTest LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_executable(testTest testtest.cpp FunctionalityTests.cpp TestGenericDictionary.cpp)

target_include_directories(testTest
    PUBLIC ../..
    PRIVATE ./ ../PerformanceTestGenerator 
)

target_compile_features(testTest PUBLIC cxx_std_23)

if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
    # warning level 4 and all warnings as errors
    target_compile_options(testTest PRIVATE /W4 /WX -D_CRT_SECURE_NO_WARNINGS)
elseif (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
        # require at least gcc 12 to get full C++20 support
        if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12)
            message(FATAL_ERROR "GCC version must be at least 12!")
        endif()
    endif()
    # lots of warnings and all warnings as errors
    target_compile_options(testTest PRIVATE -Wall -Wextra -pedantic -Werror)
endif()
cmake