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minor tweaks.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77053 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2009-07-25 07:16:59 +00:00
parent 0c795d6187
commit 81187ae82a
1 changed files with 9 additions and 8 deletions
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17
docs/ProgrammersManual.html
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@ -440,16 +440,16 @@ and <tt>Twine</tt> classes)</a>
<div class="doc_text">
<p>Although LLVM generally does not do much string manipulation, we do have
several important APIs which take string. Several important examples are the
several important APIs which take strings. Two important examples are the
Value class -- which has names for instructions, functions, etc. -- and the
StringMap class which is used extensively in LLVM and Clang.</p>
<p>These are generic classes, and they need to be able to accept strings which
may have embedded null characters. Therefore, they cannot simply take
a <tt>const char *</tt>, and taking a <tt>const std::string&</tt> requires
a <tt>const char *</tt>, and taking a <tt>const std::string&amp;</tt> requires
clients to perform a heap allocation which is usually unnecessary. Instead,
many LLVM APIs use a <tt>const StringRef&</tt> or a <tt>const Twine&</tt> for
passing strings efficiently.</p>
many LLVM APIs use a <tt>const StringRef&amp;</tt> or a <tt>const
Twine&amp;</tt> for passing strings efficiently.</p>
</div>
@ -464,11 +464,12 @@ passing strings efficiently.</p>
(a character array and a length) and supports the common operations available
on <tt>std:string</tt>, but does not require heap allocation.</p>
It can be implicitly constructed using either a C style null-terminated string
or an <tt>std::string</tt>, or explicitly with a character pointer and length.
<p>It can be implicitly constructed using a C style null-terminated string,
an <tt>std::string</tt>, or explicitly with a character pointer and length.
For example, the <tt>StringRef</tt> find function is declared as:</p>
<div class="doc_code">
iterator find(const StringRef &Key);
iterator find(const StringRef &amp;Key);
</div>
<p>and clients can call it using any one of:</p>
@ -489,7 +490,7 @@ for more information.</p>
<p>You should rarely use the <tt>StringRef</tt> class directly, because it contains
pointers to external memory it is not generally safe to store an instance of the
class (since the external storage may be freed).</p>
class (unless you know that the external storage will not be freed).</p>
</div>