我正在尝试创建构造函数初始化程序格式，例如:

Constructor()
  : initializer1(),
    initializer2()

根据the documentation ，我尝试将 BreakConstructorInitializers 设置为 BeforeColon(描述中说:“在冒号之前和逗号之后中断构造函数初始化程序。”，这正是我想要的)，但这不是我想要的，而是将分隔符放在逗号之前。我做错了什么或者这是 clang-format 中的错误？我尝试了 clang-format-5.0 和 clang-format-6.0，它们的行为方式相同。

这是我的完整 .clang 格式文件:

---
Language:        Cpp
AccessModifierOffset: -2
AlignAfterOpenBracket: Align
AlignConsecutiveAssignments: false
AlignConsecutiveDeclarations: false
AlignEscapedNewlines: Right
AlignOperands:   true
AlignTrailingComments: true
AllowAllParametersOfDeclarationOnNextLine: true
AllowShortBlocksOnASingleLine: false
AllowShortCaseLabelsOnASingleLine: false
AllowShortFunctionsOnASingleLine: None
AllowShortIfStatementsOnASingleLine: false
AllowShortLoopsOnASingleLine: false
AlwaysBreakAfterDefinitionReturnType: All
AlwaysBreakAfterReturnType: TopLevel
AlwaysBreakBeforeMultilineStrings: false
AlwaysBreakTemplateDeclarations: true
BinPackArguments: true
BinPackParameters: true
BraceWrapping:   
  AfterClass:      true
  AfterControlStatement: true
  AfterEnum:       true
  AfterFunction:   true
  AfterNamespace:  true
  AfterObjCDeclaration: true
  AfterStruct:     true
  AfterUnion:      true
  BeforeCatch:     true
  BeforeElse:      true
  IndentBraces:    true
  SplitEmptyFunction: true
  SplitEmptyRecord: true
  SplitEmptyNamespace: true
BreakBeforeBinaryOperators: None
BreakBeforeBraces: GNU
BreakBeforeInheritanceComma: false
BreakBeforeTernaryOperators: true
BreakConstructorInitializersBeforeComma: true
BreakConstructorInitializers: BeforeColon
BreakAfterJavaFieldAnnotations: false
BreakStringLiterals: true
ColumnLimit:     140
CommentPragmas:  '^ IWYU pragma:'
CompactNamespaces: false
ConstructorInitializerAllOnOneLineOrOnePerLine: false
ConstructorInitializerIndentWidth: 2
ContinuationIndentWidth: 4
Cpp11BracedListStyle: false
DerivePointerAlignment: false
DisableFormat:   false
ExperimentalAutoDetectBinPacking: false
FixNamespaceComments: false
ForEachMacros:   
  - foreach
  - Q_FOREACH
  - BOOST_FOREACH
IncludeCategories: 
  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
    Priority:        2
  - Regex:           '^(<|"(gtest|gmock|isl|json)/)'
    Priority:        3
  - Regex:           '.*'
    Priority:        1
IncludeIsMainRegex: '(Test)?$'
IndentCaseLabels: false
IndentWidth:     2
IndentWrappedFunctionNames: false
JavaScriptQuotes: Leave
JavaScriptWrapImports: true
KeepEmptyLinesAtTheStartOfBlocks: true
MacroBlockBegin: ''
MacroBlockEnd:   ''
MaxEmptyLinesToKeep: 1
NamespaceIndentation: All
ObjCBlockIndentWidth: 2
ObjCSpaceAfterProperty: false
ObjCSpaceBeforeProtocolList: true
PenaltyBreakAssignment: 2
PenaltyBreakBeforeFirstCallParameter: 19
PenaltyBreakComment: 300
PenaltyBreakFirstLessLess: 120
PenaltyBreakString: 1000
PenaltyExcessCharacter: 1000000
PenaltyReturnTypeOnItsOwnLine: 60
PointerAlignment: Right
ReflowComments:  true
SortIncludes:    false
SortUsingDeclarations: true
SpaceAfterCStyleCast: false
SpaceAfterTemplateKeyword: true
SpaceBeforeAssignmentOperators: true
SpaceBeforeParens: ControlStatements
SpaceInEmptyParentheses: false
SpacesBeforeTrailingComments: 1
SpacesInAngles:  true
SpacesInContainerLiterals: false
SpacesInCStyleCastParentheses: false
SpacesInParentheses: false
SpacesInSquareBrackets: false
Standard:        Cpp11
TabWidth:        8
UseTab:          Never
...

我尝试了 BreakConstructorInitializersBeforeComma 和 BreakConstructorInitializers 键的所有可能组合；它们似乎都不是我想要的。

结果如下:

BreakConstructorInitializersBeforeComma: false
BreakConstructorInitializers: BeforeColon

Constructor() : a(1), b(1)
{
}

BreakConstructorInitializersBeforeComma: false
BreakConstructorInitializers: BeforeComma

Constructor()
  : a(1)
  , b(1)
{
}

BreakConstructorInitializersBeforeComma: false
BreakConstructorInitializers: AfterColon

Constructor() : a(1), b(1)
{
}

BreakConstructorInitializersBeforeComma: true
BreakConstructorInitializers: BeforeColon

Constructor()
  : a(1)
  , b(1)
{
}

BreakConstructorInitializersBeforeComma: true
BreakConstructorInitializers: BeforeComma

Constructor()
  : a(1)
  , b(1)
{
}   

BreakConstructorInitializersBeforeComma: true
BreakConstructorInitializers: AfterColon

Constructor() : a(1), b(1)
{
}

最佳答案

我和你有同样的问题，调查了一下。

首先，BreakConstructorInitializers 被更改为一个枚举，BreakConstructorInitializersBeforeComma 被弃用。 ( https://reviews.llvm.org/D32479 )

当我查看您实际想要实现的目标时，您想要的是 BreakConstructorInitializersAFTERComma，这不是一回事。您可以仅通过 ColumnLimit 实现您想要的。可悲的是。

关于c++ - 在构造函数中将 break 放在冒号之前和逗号之后，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47884523/