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Reduce string allocations

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Chris Thrasher 2024-01-14 13:51:58 -07:00
parent 277a311966
commit d663dd1cc9
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GPG Key ID: 56FB686C9DFC8E2C
1 changed files with 5 additions and 4 deletions
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9
examples/joystick/Joystick.cpp
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@ -18,17 +18,17 @@ struct JoystickObject
sf::Text value; sf::Text value;
}; };
using Texts = std::unordered_map<std::string, JoystickObject>; using Texts = std::unordered_map<std::string_view, JoystickObject>;
Texts texts; Texts texts;
std::ostringstream sstr; std::ostringstream sstr;
float threshold = 0.1f; float threshold = 0.1f;
// Axes labels in as strings // Axes labels in as strings
const std::array<std::string, 8> axislabels = {"X", "Y", "Z", "R", "U", "V", "PovX", "PovY"}; const std::array<std::string_view, 8> axislabels = {"X", "Y", "Z", "R", "U", "V", "PovX", "PovY"};
// Helper to set text entries to a specified value // Helper to set text entries to a specified value
template <typename T> template <typename T>
void set(const std::string& label, const T& value) void set(std::string_view label, const T& value)
{ {
sstr.str(""); sstr.str("");
sstr << value; sstr << value;
@ -122,7 +122,8 @@ int main()
for (unsigned int i = 0; i < sf::Joystick::AxisCount; ++i) for (unsigned int i = 0; i < sf::Joystick::AxisCount; ++i)
{ {
const auto [it, success] = texts.try_emplace(axislabels[i], const auto [it, success] = texts.try_emplace(axislabels[i],
JoystickObject{{font, axislabels[i] + ":"}, {font, "N/A"}}); JoystickObject{{font, std::string(axislabels[i]) + ":"},
{font, "N/A"}});
auto& [label, value] = it->second; auto& [label, value] = it->second;
label.setPosition({5.f, 5.f + (static_cast<float>(i + 4) * font.getLineSpacing(14))}); label.setPosition({5.f, 5.f + (static_cast<float>(i + 4) * font.getLineSpacing(14))});
value.setPosition({80.f, 5.f + (static_cast<float>(i + 4) * font.getLineSpacing(14))}); value.setPosition({80.f, 5.f + (static_cast<float>(i + 4) * font.getLineSpacing(14))});