stringTemplates.C
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27 
28 #include <cstdio>
29 
30 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
31 
32 // Could also consider generalizing with C++11 variadic templates
33 
34 template<class PrimitiveType>
36 (
37  std::string& output,
38  const char* fmt,
39  const PrimitiveType& val
40 )
41 {
42  // Use snprintf with zero to establish the size (without '\0') required
43  int n = ::snprintf(nullptr, 0, fmt, val);
44  if (n > 0)
45  {
46  output.resize(n+1);
47  char* buf = &(output[0]);
48 
49  // Print directly into buffer, no stripping desired
50  n = ::snprintf(buf, n+1, fmt, val);
51  output.resize(n);
52  }
53  else
54  {
55  output.clear();
56  }
57 
58  return output.size();
59 }
60 
61 
62 template<class PrimitiveType>
64 (
65  std::string& output,
66  const std::string& fmt,
67  const PrimitiveType& val
68 )
69 {
70  return string_printf(output, fmt.c_str(), val);
71 }
72 
73 
74 // ************************************************************************* //
Foam::string::string_printf
static std::string::size_type string_printf(std::string &output, const char *fmt, const PrimitiveType &val)
A printf-style formatter for a primitive.
Definition: stringTemplates.C:36
n
label n
Definition: TABSMDCalcMethod2.H:31
size_type
graph_traits< Graph >::vertices_size_type size_type
Definition: SloanRenumber.C:76