Further details may exist on the talk page. Please expand the section to include this information. This section is missing information about Bazaar LCA merge ( tree/ file) and the not-quite-weave merge BitKeeper uses. In these cases, revision control systems resort to the user to specify the intended merge result. Manual merging is also required when automatic merging runs into a change conflict for instance, very few automatic merge tools can merge two changes to the same line of code (say, one that changes a function name, and another that adds a comment). For instance, if two systems have slightly differing versions of a configuration file and a user wants to have the good stuff in both, this can usually be achieved by merging the configuration files by hand, picking the wanted changes from both sources (this is also called two-way merging). Manual merging is what people have to resort to (possibly assisted by merging tools) when they have to reconcile files that differ. For instance, Wikipedia allows two people to edit the same article at the same time when the latter contributor saves, their changes are merged into the article instead of overwriting the previous set of changes. Also, other pieces of software deploy automatic merging if they allow for editing the same content simultaneously. This allows for a fine-grained merge that avoid spurious conflicts.Īutomatic merging is what version control software does when it reconciles changes that have happened simultaneously (in a logical sense). Structured merge tools, or AST merge, turn the source code into aįully resolved AST. This is limited, as a line of text does not represent the structure of source code.
This is what Unix tools (diff/patch) and CVS tools (SVN, Git) use. Unstructured merge operates on raw text, typically using lines of text as atomic There are two types of merges: unstructured and structured. Many revision control software tools include merge capabilities. In other cases, a person must decide exactly what the resulting files should contain. In some cases, the merge can be performed automatically, because there is sufficient history information to reconstruct the changes, and the changes do not conflict.
The result is a single collection of files that contains both sets of changes. Most often, it is necessary when a file is modified on two independent branches and subsequently merged. In version control, merging (also called integration) is a fundamental operation that reconciles multiple changes made to a version-controlled collection of files. Example history graph of a version-controlled project, with merges as red arrows
0 kommentar(er)
