Define the interfaces to create column family modifications.
Applications can modify a Cloud Bigtable schema through a set of column family modifications. These modifications may include creating new column families, deleting existing column families, or changing the garbage collection rules for existing column families.
This class contain helper functions to create the different protos encapsulating these changes.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis documentation outlines the \u003ccode\u003eColumnFamilyModification\u003c/code\u003e class, which enables modifying Cloud Bigtable schemas by creating, deleting, or updating column families and their garbage collection rules.\u003c/p\u003e\n"],["\u003cp\u003eThe class provides static functions like \u003ccode\u003eCreate\u003c/code\u003e, \u003ccode\u003eUpdate\u003c/code\u003e, and \u003ccode\u003eDrop\u003c/code\u003e to generate modifications for creating new column families, updating existing ones, or dropping column families, respectively.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation also details the use of default constructors and assignment operators for \u003ccode\u003eColumnFamilyModification\u003c/code\u003e, alongside \u003ccode\u003eas_proto()\u003c/code\u003e functions that convert modifications to a proto form.\u003c/p\u003e\n"],["\u003cp\u003eThe class version is in the 2.x range, with different versions available, and the most recent release candidate being 2.37.0-rc, while this page specifically details the information for version 2.29.0.\u003c/p\u003e\n"]]],[],null,["# Class ColumnFamilyModification (2.29.0)\n\nVersion 2.29.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/bigtable/latest/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.41.0](/cpp/docs/reference/bigtable/2.41.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.40.0](/cpp/docs/reference/bigtable/2.40.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.39.0](/cpp/docs/reference/bigtable/2.39.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.38.0](/cpp/docs/reference/bigtable/2.38.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.37.0](/cpp/docs/reference/bigtable/2.37.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.36.0](/cpp/docs/reference/bigtable/2.36.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.35.0](/cpp/docs/reference/bigtable/2.35.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.34.0](/cpp/docs/reference/bigtable/2.34.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.33.0](/cpp/docs/reference/bigtable/2.33.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.32.0](/cpp/docs/reference/bigtable/2.32.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.31.0](/cpp/docs/reference/bigtable/2.31.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.30.0](/cpp/docs/reference/bigtable/2.30.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.29.0](/cpp/docs/reference/bigtable/2.29.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.28.0](/cpp/docs/reference/bigtable/2.28.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.27.0](/cpp/docs/reference/bigtable/2.27.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.26.0](/cpp/docs/reference/bigtable/2.26.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.25.1](/cpp/docs/reference/bigtable/2.25.1/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.24.0](/cpp/docs/reference/bigtable/2.24.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.23.0](/cpp/docs/reference/bigtable/2.23.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.22.1](/cpp/docs/reference/bigtable/2.22.1/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.21.0](/cpp/docs/reference/bigtable/2.21.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.20.0](/cpp/docs/reference/bigtable/2.20.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.19.0](/cpp/docs/reference/bigtable/2.19.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.18.0](/cpp/docs/reference/bigtable/2.18.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.17.0](/cpp/docs/reference/bigtable/2.17.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.16.0](/cpp/docs/reference/bigtable/2.16.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.15.1](/cpp/docs/reference/bigtable/2.15.1/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.14.0](/cpp/docs/reference/bigtable/2.14.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.13.0](/cpp/docs/reference/bigtable/2.13.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.12.0](/cpp/docs/reference/bigtable/2.12.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification)\n- [2.11.0](/cpp/docs/reference/bigtable/2.11.0/classgoogle_1_1cloud_1_1bigtable_1_1ColumnFamilyModification) \nDefine the interfaces to create column family modifications. \nApplications can modify a Cloud Bigtable schema through a set of column family modifications. These modifications may include creating new column families, deleting existing column families, or changing the garbage collection rules for existing column families.\n\nThis class contain helper functions to create the different protos encapsulating these changes.\n\nConstructors\n------------\n\n### ColumnFamilyModification(ColumnFamilyModification \\&\\&)\n\nUse default constructors and assignments.\n\n### ColumnFamilyModification(ColumnFamilyModification const \\&)\n\nUse default constructors and assignments.\n\nOperators\n---------\n\n### operator=(ColumnFamilyModification \\&\\&)\n\nUse default constructors and assignments.\n\n### operator=(ColumnFamilyModification const \\&)\n\nUse default constructors and assignments.\n\nFunctions\n---------\n\n### static Create(std::string, GcRule)\n\nReturn a modification that creates a new column family.\n\n### static Update(std::string, GcRule)\n\nReturn a modification that creates a new column family.\n\n### static Drop(std::string)\n\nReturn a modification that drops the `id` column family.\n\n### as_proto() const \\&\n\nConvert to the proto form.\n\n### as_proto() \\&\\&\n\nMove out the underlying proto contents."]]
