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Empty string: Difference between revisions
→{{header|C++}}
Childishbeat (talk | contribs) m (Zoomscript example added.) |
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Line 443:
// ...
// empty string declaration
std::string str; // (default constructed)
std::string str(); // (default constructor, no parameters)
std::string str{}; // (default initialized)
std::string str(""); // (const char[] conversion)
std::string str{""}; // (const char[] initializer list)
if (str.empty()) { ... } // to test if string is empty
Line 450 ⟶ 458:
if (str.length() == 0) { ... }
if (str == "") { ... }</lang>
// make a std::string empty
str.clear(); // (builtin clear function)
str = ""; // replace contents with empty string
str = {}; // swap contents with temp string (empty),then destruct temp
std::swap(str, {}); // swap contents with empty string (empty initializer list)
// create an array of empty strings
std::string s_array[100]; // 100 initialized to "" (fixed size)
std::array<std::string, 100> arr; // 100 initialized to "" (fixed size)
std::vector<std::string>(100,""); // 100 initialized to "" (variable size, 100 starting size)
// create empty string as default parameter
void func( std::string& s = {} ); // {} generated default std:string instance
=={{header|C sharp}}==
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