47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
// Copyright 2002 and onwards Google Inc.
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//
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// Printf variants that place their output in a C++ string.
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//
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// Usage:
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// string result = StringPrintf("%d %s\n", 10, "hello");
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// SStringPrintf(&result, "%d %s\n", 10, "hello");
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// StringAppendF(&result, "%d %s\n", 20, "there");
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#pragma once
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#include <stdarg.h>
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#include <string>
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using std::string;
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#include <vector>
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using std::vector;
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#include "gutil/port.h"
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// Return a C++ string
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extern string StringPrintf(const char* format, ...)
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// Tell the compiler to do printf format string checking.
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PRINTF_ATTRIBUTE(1, 2);
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// Store result into a supplied string and return it
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extern const string& SStringPrintf(string* dst, const char* format, ...)
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// Tell the compiler to do printf format string checking.
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PRINTF_ATTRIBUTE(2, 3);
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// Append result to a supplied string
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extern void StringAppendF(string* dst, const char* format, ...)
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// Tell the compiler to do printf format string checking.
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PRINTF_ATTRIBUTE(2, 3);
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// Lower-level routine that takes a va_list and appends to a specified
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// string. All other routines are just convenience wrappers around it.
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extern void StringAppendV(string* dst, const char* format, va_list ap);
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// The max arguments supported by StringPrintfVector
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extern const int kStringPrintfVectorMaxArgs;
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// You can use this version when all your arguments are strings, but
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// you don't know how many arguments you'll have at compile time.
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// StringPrintfVector will LOG(FATAL) if v.size() > kStringPrintfVectorMaxArgs
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extern string StringPrintfVector(const char* format, const vector<string>& v);
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