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obs/gs/effect-parameter: Use string_view over std::string

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Using std::string_view over std::string (and const std::string&) has the advantage that we skip potential temporary std::string objects that are immediately thrown away, thus slowing down the code. It can also be implicitly cast to std::string, which makes it compatible with existing code that uses std::string.
This commit is contained in:
Michael Fabian 'Xaymar' Dirks 2020-05-13 08:38:05 +02:00
parent 9db3dfd874
commit 3a40a63832
3 changed files with 11 additions and 12 deletions
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1
source/common.hpp
View file

@ -36,6 +36,7 @@
#include <memory>
#include <stdexcept>
#include <string>
#include <string_view>
#include <type_traits>
#include <utility>

14
source/obs/gs/gs-effect-parameter.cpp
View file

@ -112,11 +112,9 @@ try {
return *this;
}
std::string gs::effect_parameter::get_name()
std::string_view gs::effect_parameter::get_name()
{
const char* name_c = get()->name;
std::size_t name_len = strnlen(name_c, 256);
return name_c ? std::string(name_c, name_c + name_len) : std::string();
return std::string_view{get()->name};
}
gs::effect_parameter::type gs::effect_parameter::get_type()
@ -166,11 +164,11 @@ gs::effect_parameter gs::effect_parameter::get_annotation(std::size_t idx)
return effect_parameter(get()->annotations.array + idx, this);
}
gs::effect_parameter gs::effect_parameter::get_annotation(std::string name)
gs::effect_parameter gs::effect_parameter::get_annotation(const std::string_view name)
{
for (std::size_t idx = 0; idx < get()->annotations.num; idx++) {
auto ptr = get()->annotations.array + idx;
if (strcmp(ptr->name, name.c_str()) == 0) {
if (name == std::string_view{ptr->name}) {
return gs::effect_parameter(ptr, this);
}
}
@ -178,7 +176,7 @@ gs::effect_parameter gs::effect_parameter::get_annotation(std::string name)
return nullptr;
}
bool gs::effect_parameter::has_annotation(std::string name)
bool gs::effect_parameter::has_annotation(const std::string_view name)
{
auto eprm = get_annotation(name);
if (eprm)
@ -186,7 +184,7 @@ bool gs::effect_parameter::has_annotation(std::string name)
return false;
}
bool gs::effect_parameter::has_annotation(std::string name, effect_parameter::type type)
bool gs::effect_parameter::has_annotation(const std::string_view name, effect_parameter::type type)
{
auto eprm = get_annotation(name);
if (eprm)

8
source/obs/gs/gs-effect-parameter.hpp
View file

@ -61,15 +61,15 @@ namespace gs {
effect_parameter(effect_parameter&& rhs) noexcept;
effect_parameter& operator=(effect_parameter&& rhs) noexcept;
std::string get_name();
std::string_view get_name();
type get_type();
std::size_t count_annotations();
effect_parameter get_annotation(std::size_t idx);
effect_parameter get_annotation(std::string name);
bool has_annotation(std::string name);
bool has_annotation(std::string name, effect_parameter::type type);
effect_parameter get_annotation(const std::string_view name);
bool has_annotation(const std::string_view name);
bool has_annotation(const std::string_view name, effect_parameter::type type);
public /* Memory API */:
std::size_t get_default_value_size_in_bytes()